U.S. flag

An official website of the United States government

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Https

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

PubAg

Main content area

You searched for: Publication year rev 7981-2019 Remove constraint Publication year rev: 7981-2019 Subject term gold Remove constraint Subject term: gold Subject term oxidation Remove constraint Subject term: oxidation
Start Over

Search

200  Search Results

« Previous | 1 - 100 of 200 |
Number of results to display per page

Search Results

1. A High-Efficiency Electrocatalyst for Oxidizing Glucose: Ultrathin Nanosheet Co-Based Organic Framework Assemblies

Author:
Qing Li; Zhifang Shao; Ting Han; Mingbo Zheng; Huan Pang
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.9 pp. 8986-8992
ISSN:
2168-0485
Subject:
catalysts; cupric oxide; electrochemistry; electrolytes; environmental degradation; glucose; gold; nanosheets; oxidation; silver; surface area
Abstract:
... The glucose oxidation reaction (GOR) relies on noble metals (such as Au and Ag) and metal oxides (such as CuO, RuO₂, and IrO₂) as catalysts in a general way. However, these metal-based candidate materials often suffer from a variety of defects, including high cost, complexity of their synthesis method, and damage to the environment. Here, we synthesized ultrathin two-dimensional (2D) nanosheets (a ...
DOI:
10.1021/acssuschemeng.9b01148

2. A Sensitive and Simple Impedance Sensing Strategy for Glutathione and Glutathione Reductase Activity Detection

Author:
Yaohui Wu; Lun Jiang; Ge Ning; Lei Chu; Wen Liu; Yonghong Wang; Yunlin Zhao
Source:
Journal of analytical chemistry 2019 v.74 no.5 pp. 505-512
ISSN:
1061-9348
Subject:
NADP (coenzyme); adenine; colorimetry; detection limit; electrochemistry; electrodes; enzyme activity; equations; glutathione; glutathione-disulfide reductase; gold; medicine; oxidation; pH
Abstract:
... A simple electrochemical method for detecting glutathione reductase was developed in this work. It was observed that the impedance of electrode increased obviously after the electrode modification by glutathione, and the value of impedance was closely related to the reduced glutathione (GSH) concentration. Based on the fact that glutathione reductase (GR) could catalyze oxidized glutathione (GSSG) ...
DOI:
10.1134/S1061934819050101

3. A Single Layer of MoS₂ Activates Gold for Room Temperature CO Oxidation on an Inert Silica Substrate

Author:
Kortney Almeida; Pedro Peña; Takat B. Rawal; William C. Coley; Amir-Ali Akhavi; Michelle Wurch; Koichi Yamaguchi; Duy Le; Talat S. Rahman; Ludwig Bartels
Source:
Journal of physical chemistry 2019 v.123 no.11 pp. 6592-6598
ISSN:
1932-7455
Subject:
X-ray photoelectron spectroscopy; adsorption; ambient temperature; carbon dioxide; carbon monoxide; density functional theory; desorption; gold; molybdenum disulfide; nanogold; oxidation; oxygen; silica
Abstract:
... We demonstrate the facile deposition of catalytically active stable Au nanoparticles on single-layer MoS₂, on an inert oxide substrate (SiO₂). Unlike a gold surface, adsorption of CO on these gold particles proceeds even at room temperature. Subsequent exposure to oxygen leads to CO₂ formation and desorption along a reaction pathway described, in detail, by density functional theory. The barrier t ...
DOI:
10.1021/acs.jpcc.8b12325

4. A catechol biosensor based on immobilizing laccase to Fe3O4@Au core-shell nanoparticles

Author:
Changiz Karami; Mohammad Ali Taher
Source:
International journal of biological macromolecules 2019 v.129 pp. 84-90
ISSN:
0141-8130
Subject:
biosensors; catechol; detection limit; gold; laccase; magnetism; nanogold; nanoparticles; oxidation; pH; scanning electron microscopy; thermogravimetry; transmission electron microscopy; ultraviolet-visible spectroscopy; wavelengths; zeta potential
Abstract:
... This work is directed towards the synthesis of the magnetic nanoparticle in a core and a gold shell with immobilized of laccase on its surface (Fe3O4@Au@ Lac). The prepared Fe3O4@Au@ Lac core/shell nanoparticles are characterized by means TEM, SEM, DLS, zeta potential, UV-Vis, and TGA. Meanwhile, as an example of the applications, Biosensor activity was investigated by using the oxidation of catec ...
DOI:
10.1016/j.ijbiomac.2019.02.015

5. A comparative study of secondary depolymerization methods on oxidized lignins

Author:
Yang Song; Ali Hussain Motagamwala; Steven D. Karlen; James A. Dumesic; John Ralph; Justin K. Mobley; Mark Crocker
Source:
Green chemistry 2019 v.21 no.14 pp. 3940-3947
ISSN:
1463-9270
Subject:
aldehydes; aromatic acids; catalysts; chemical treatment; comparative study; depolymerization; gold; green chemistry; hydrolysis; lignin; nitrites; oxidation; oxygen; quinones
Abstract:
... Selective oxidation of lignin's β-aryl ether units combined with secondary chemical treatment for depolymerization can generate valuable oxygen-rich aromatics. Although there have been many reports of the successful oxidative depolymerization of lignin, an accurate assessment of the merits of each method is hampered by the wide array of lignins used. Here, we test a selection of literature methods ...
DOI:
10.1039/c9gc01663e

6. A direct “touch” approach for gold nanoflowers decoration on graphene/ionic liquid composite modified electrode with good properties for sensing bisphenol A

Author:
Shaogui He; Ying Ma; Jieyi Zhou; Jun Zeng; Xiaofang Liu; Zhiyong Huang; Xiaomei Chen; Xi Chen
Source:
Talanta 2019 v.191 pp. 400-408
ISSN:
0039-9140
Subject:
X-ray photoelectron spectroscopy; bisphenol A; bottles; detection limit; electrochemistry; energy-dispersive X-ray analysis; glassy carbon electrode; gold; graphene; ionic liquids; liquids; nanoflowers; nanogold; noodles; oxidation; paper; scanning electron microscopy
Abstract:
... In the present work, a direct “touch” method was developed for attaching AuNPs with clean surface on the graphene-ionic liquid modified glassy carbon electrode (G-IL GCE). The morphology and composition of the thus-prepared AuNPs on G-IL GCE were characterized by scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The results showed that AuNPs w ...
DOI:
10.1016/j.talanta.2018.08.093

7. A dual-aptamer-based biosensor for specific detection of breast cancer biomarker HER2 via flower-like nanozymes and DNA nanostructures

Author:
Dan Ou; Duanping Sun; Xiangan Lin; Zhixian Liang; Yongsheng Zhong; Zuanguang Chen
Source:
Journal of materials chemistry B 2019 v.7 no.23 pp. 3661-3669
ISSN:
2050-7518
Subject:
aptasensors; biomarkers; breast neoplasms; complementary DNA; disease diagnosis; electrochemistry; electrodes; erbB-2 receptor; gold; hydrogen peroxide; hydroquinone; manganese oxides; nanomaterials; neoplasm cells; nucleic acid hybridization; oligonucleotides; oxidation; peroxidase; quinones
Abstract:
... Developing highly sensitive and selective detection strategies for biomarkers is beneficial for fundamental research and disease diagnosis. Herein, we constructed a sandwich-type electrochemical aptasensor to detect the breast cancer cell biomarker Human Epidermal Growth Factor Receptor 2 (HER2). The aptasensor was a combination of tetrahedral DNA nanostructures (TDNs)–aptamer as recognition probe ...
DOI:
10.1039/c9tb00472f

8. A label-free electrochemical biosensor for ultra-sensitively detecting telomerase activity based on the enhanced catalytic currents of acetaminophen catalyzed by Au nanorods

Author:
Lei Wang; Tianjiao Meng; Guangshun Yu; Shasha Wu; Jingjing Sun; Huixian Jia; Huan Wang; Xinjian Yang; Yufan Zhang
Source:
Biosensors & bioelectronics 2019 v.124-125 pp. 53-58
ISSN:
0956-5663
Subject:
acetaminophen; biosensors; complementary DNA; detection limit; early diagnosis; electrochemistry; enzyme activity; gold; human cell lines; nanogold; nanorods; neoplasms; oxidation; telomerase
Abstract:
... An electrochemical biosensor was designed for the determination of telomerase activity using an enzyme-free, PCR-free, and convenient electrochemical strategy. In this work, the electrochemical biosensor was constructed through the functionalization of Au nanorods with a carboxylic group (AuNRs-3) and subsequent immobilization with capture DNA (cDNA) for sensing telomerase activity. Upon telomeras ...
DOI:
10.1016/j.bios.2018.09.098

9. A new colorimetric assay for amylase based on starch-supported Cu/Au nanocluster peroxidase-like activity

Author:
Zahra Dehghani; Javad Mohammadnejad; Morteza Hosseini
Source:
Analytical and bioanalytical chemistry 2019 v.411 no.16 pp. 3621-3629
ISSN:
1618-2642
Subject:
alpha-amylase; ambient temperature; blood serum; colorimetry; copper; detection limit; enzyme activity; gold; hydrogen peroxide; nanogold; nanoparticles; oxidation; peroxidase; stabilizers; starch
Abstract:
... In this paper, we present a new colorimetric technique as a novel assay for the easy and direct detection of α-amylase activity. This detection system utilizes the interaction of α-amylase with starch that is supporting copper/gold (Cu/Au) nanoclusters. The Cu/Au nanoclusters are synthesized using starch as a stabilizing agent at room temperature. These nanoclusters show robust peroxidase-like act ...
DOI:
10.1007/s00216-019-01844-9

10. A novel switchable fluorescent sensor for facile and highly sensitive detection of alkaline phosphatase activity in a water environment with gold/silver nanoclusters

Author:
Xiaoyan Wang; Zhenjiang Liu; Wanying Zhao; Jianfan Sun; Bin Qian; Xinwei Wang; Huawei Zeng; Daolin Du; Jinsheng Duan
Source:
Analytical and bioanalytical chemistry 2019 v.411 no.5 pp. 1009-1017
ISSN:
1618-2642
Subject:
alkaline phosphatase; ascorbic acid; bovine serum albumin; catalytic activity; enzyme activity; eutrophication; fluorescence; gold; nanosilver; oxidation; paper; phosphates; potassium permanganate; surface water; ultraviolet-visible spectroscopy
Abstract:
... A novel fluorescent sensor based on bovine serum albumin stabilized gold/silver nanoclusters (BSA-Au/Ag NCs) was developed for sensitive and facile detection of alkaline phosphatase (ALP) activity. For this fluorescent sensor, ascorbic acid 2-phosphate (AAP) was decomposed into ascorbic acid (AA) and phosphate by catalysis with ALP. The initial red fluorescence of the BSA-Au/Ag NCs was effectively ...
DOI:
10.1007/s00216-018-1514-8

11. A repertoire of biomedical applications of noble metal nanoparticles

Author:
Mohammad Azharuddin; Geyunjian H. Zhu; Debapratim Das; Erdogan Ozgur; Lokman Uzun; Anthony P. F. Turner; Hirak K. Patra
Source:
Chemical communications 2019 v.55 no.49 pp. 6964-6996
ISSN:
1364-548X
Subject:
biomedical research; biotechnology; corrosion; diagnostic techniques; gold; iridium; medicine; nanogold; nanoparticles; nanosilver; osmium; oxidation; palladium; platinum; rhodium; ruthenium; silver; temperature; therapeutics
Abstract:
... Noble metals comprise any of several metallic chemical elements that are outstandingly resistant to corrosion and oxidation, even at elevated temperatures. This group is not strictly defined, but the tentative list includes ruthenium, rhodium, palladium, silver, osmium, iridium, platinum and gold, in order of atomic number. The emerging properties of noble metal nanoparticles are attracting huge i ...
DOI:
10.1039/c9cc01741k

12. A signal-on magnetic electrochemical immunosensor for ultra-sensitive detection of saxitoxin using palladium-doped graphitic carbon nitride-based non-competitive strategy

Author:
Xin Jin; Jianlang Chen; Xiaoxue Zeng; LiangJun Xu; Yongning Wu; FengFu Fu
Source:
Biosensors & bioelectronics 2019 v.128 pp. 45-51
ISSN:
0956-5663
Subject:
antibodies; bioaccumulation; carbon nitride; electrochemistry; electrodes; gold; graphene; immunosensors; magnetism; oxidation; peroxidase; risk; seafoods; seawater; shellfish; standard deviation; thermal stability; toxicity; water solubility
Abstract:
... Saxitoxin (STX) has high toxicity, and is water soluble, acid stable and thermostable. Therefore, STX in seawater can be accumulated by marine organism to form bioaccumulation. To ensure the safety of seafood for consumption, it is crucial to accurately determine trace STX in seawater and seafood. We herein developed a novel magnetic electrochemical immunosensor for ultra-sensitive detection of ST ...
DOI:
10.1016/j.bios.2018.12.036

13. Abnormal thermal stability of sub-10 nm Au nanoparticles and their high catalytic activity

Author:
Xiaoqing Cao; Jun Zhou; Hongna Wang; Song Li; Wei Wang; Gaowu Qin
Source:
Journal of materials chemistry A 2019 v.7 no.18 pp. 10980-10987
ISSN:
2050-7496
Subject:
activation energy; catalysts; catalytic activity; cooling; gold; heat treatment; hydrogenation; hydrolysis; liquids; longevity; magnesium oxide; models; nanogold; nitrogen; oxidation; p-nitrophenol; palladium; ruthenium; silanes; sodium borohydride; temperature; thermal stability
Abstract:
... Supported Au nanoparticles have been attracting increasing attention due to their unique catalytic performance. However, their thermal and catalytic stability against sintering and aggregation during preparation and reactions remains a serious issue in practical applications, and what is even more difficult is to solve this mutually exclusive problem by a feasible technique. Here, we propose a sim ...
DOI:
10.1039/c8ta10515d

14. Activating molecular oxygen with Au/CeO₂ for the conversion of lignin model compounds and organosolv lignin

Author:
Wu-Lin Song; Qingmeng Dong; Liang Hong; Zhou-Qi Tian; Li-Na Tang; Wenli Hao; Hongxi Zhang
Source:
RSC advances 2019 v.9 no.53 pp. 31070-31077
ISSN:
2046-2069
Subject:
catalysts; catalytic activity; ceric oxide; electron paramagnetic resonance spectroscopy; gold; lignin; methanol; models; oxidants; oxidation; oxygen; solvents; superoxide anion; vanillin
Abstract:
... Au/CeO₂ was demonstrated to be a high efficiency catalyst for the conversion of 2-phenoxyacetophenol (PP-ol) employing O₂ as an oxidant and methyl alcohol as the solvent without using an erosive strong base or acid. Mechanistic investigations, including emission quenching experiments, electron spin-resonance (ESR) and intermediate verification experiments, were carried out. The results verified th ...
DOI:
10.1039/c9ra04838c

15. Activation of atomically precise silver clusters on carbon supports for styrene oxidation reactions

Author:
Kazeem O. Sulaiman; V. Sudheeshkumar; Robert W. J. Scott
Source:
RSC advances 2019 v.9 no.48 pp. 28019-28027
ISSN:
2046-2069
Subject:
X-ray absorption spectroscopy; X-ray photoelectron spectroscopy; carbon; catalysts; catalytic activity; energy; gold; oxidation; particle size; silver; styrene; surface area; temperature; thiols
Abstract:
... Metal clusters have distinct features such as large surface area, low-coordination-atom enriched surfaces, and discrete energy levels that influence their behavior during catalytic reactions. Atomically-precise Ag clusters, which are analogues of more well-studied Au clusters, are yet to be fully explored as catalysts for various chemical reactions. 2,4-Dimethylbenzenethiol-protected Ag₂₅ clusters ...
DOI:
10.1039/c9ra05566e

16. Alkaline aqueous solution of sodium decahydro-closo-decaborate Na2B10H10 as liquid anodic fuel

Author:
Salem Ould-Amara; Eddy Petit; Dominique Granier; Pascal G. Yot; Umit B. Demirci
Source:
Renewable energy 2019 v.143 pp. 551-557
ISSN:
0960-1481
Subject:
anions; aqueous solutions; electrochemistry; electrodes; fuels; gold; oxidation; platinum; renewable energy sources; silver
Abstract:
... The potential of the decahydro-closo-decaborate anion B10H102− in alkaline aqueous solution as anodic fuel was investigated by using cyclic voltammetry and three different bulk metal electrodes (platinum, gold and silver). The sodium salt NaB10H10 was first synthesized, fully characterized and assessed for its relative stability in alkaline medium for 25 days. Then, oxidation of B10H102− in alkali ...
DOI:
10.1016/j.renene.2019.05.019

17. Alternative to Noble Metal Substrates: Metallic and Plasmonic Ti₃O₅ Hierarchical Microspheres for Surface Enhanced Raman Spectroscopy

Author:
Yahui Li; Hua Bai; Junfeng Zhai; Wencai Yi; Junfang Li; Haifeng Yang; Guangcheng Xi
Source:
Analytical chemistry 2019 v.91 no.7 pp. 4496-4503
ISSN:
1520-6882
Subject:
Raman spectroscopy; corrosion; gold; microparticles; nanosilver; oxidation; photocatalysis; semiconductors; silver; temperature; titanium dioxide
Abstract:
... Compared with noble metals, improving the sensitivity of semiconducting surface-enhanced Raman scattering (SERS) substrates is of great significance to their fundamental research and practical application of Raman spectroscopy. In this paper, it is found that the SERS sensitivity is increased by 10 000 times by reducing the semiconducting TiO₂ microspheres to quasi-metallic Ti₃O₅ microspheres. Its ...
DOI:
10.1021/acs.analchem.8b05282

18. An alternative approach to recover lead, silver and gold from black gossan (polymetallic ore). Study of biological oxidation and lead recovery stages

Author:
Juan Lorenzo-Tallafigo; Nieves Iglesias-González; Alfonso Mazuelos; Rafael Romero; Francisco Carranza
Source:
Journal of cleaner production 2019 v.207 pp. 510-521
ISSN:
0959-6526
Subject:
Acidithiobacillus ferrooxidans; activation energy; anglesite; citrates; extremophiles; gold; gypsum; jarosite; leaching; lead; oxidation; pH; pulp; quartz; silver; sulfides; sulfuric acid; temperature; washing
Abstract:
... A novel procedure to recover lead, silver and gold from polymetallic sulphide ores, cleaner than the traditional hydrometallurgical route (hot brine leaching), is proposed. This process consists of a biooxidation stage, where sulphides are oxidised by the action of extremophiles, followed by an acid washing and a citrate leaching in which lead is recovered. The final solid obtained, mainly compose ...
DOI:
10.1016/j.jclepro.2018.10.041

19. An electrochemical biosensor based on Hairpin-DNA modified gold electrode for detection of DNA damage by a hybrid cancer drug intercalation

Author:
Katherine Lozano Untiveros; Emanuella Gomes da Silva; Fabiane Caxico de Abreu; Edeildo Ferreira da Silva-Júnior; João Xavier de Araújo-Junior; Thiago Mendoça de Aquino; Stephanie M. Armas; Ricardo Olímpio de Moura; Francisco J.B. Mendonça-Junior; Vanessa Lima Serafim; Karin Chumbimuni-Torres
Source:
Biosensors & bioelectronics 2019 v.133 pp. 160-168
ISSN:
0956-5663
Subject:
DNA damage; adenine; antineoplastic agents; biosensors; calves; complementary DNA; computer simulation; electrochemistry; electrodes; gold; guanine; hydrogen bonding; hydrophobic bonding; oxidation; thymus gland; ultraviolet-visible spectroscopy
Abstract:
... An efficient and new electrochemical biosensor for detection of DNA damage, induced by the interaction of the hybrid anti-cancer compound (7ESTAC01) with DNA, was studied by differential pulse voltammetry (DPV). The biosensor consists of a Stem-Loop DNA (SL-DNA) probe covalently attached to the gold electrode (GE) surface that hybridizes to a complementary DNA strand (cDNA) to form a double-strand ...
DOI:
10.1016/j.bios.2019.02.071

20. An electrochemical biosensor based on hemoglobin-oligonucleotides-modified electrode for detection of acrylamide in potato fries

Author:
Maryam Asnaashari; Reza Esmaeilzadeh Kenari; Reza Farahmandfar; Khalil Abnous; Seyed Mohammad Taghdisi
Source:
Food chemistry 2019 v.271 pp. 54-61
ISSN:
0308-8146
Subject:
DNA; acrylamides; agarose; biosensors; carcinogens; electrodes; gels; gold; neurotoxins; oxidation; pH; potatoes; processed foods
Abstract:
... Acrylamide a neurotoxin and strong carcinogen, is found in various thermally processed foods. In this study, an electrochemical sensor for detection of acrylamide using double stranded DNA (dsDNA)/Hemoglobin (Hb)-modified screen printed gold electrode (SPGE) was designed. The immobilization of ssDNA1-SH on the surface of SPGE was confirmed by cyclic voltammetry, and the interaction between ssDNA2- ...
DOI:
10.1016/j.foodchem.2018.07.150

21. An ultrasensitive aptasensor based on self-enhanced Au nanoclusters as highly efficient electrochemiluminescence indicator and multi-site landing DNA walker as signal amplification

Author:
Fang Yang; Xia Zhong; Xinya Jiang; Ying Zhuo; Ruo Yuan; Shaping Wei
Source:
Biosensors & bioelectronics 2019 v.130 pp. 262-268
ISSN:
0956-5663
Subject:
DNA; aptasensors; detection limit; electrochemiluminescence; gold; mucins; nanogold; oxidation
Abstract:
... Gold nanoclusters (Au NCs) have been shown to be prospective nanoscale electrochemiluminescence (ECL) materials that are being extensively explored in bioanalysis. However, the low ECL efficiency of Au NCs has been a bottleneck barrier for their better bioapplications. To overcome this disadvantage, a low oxidation potential co-reactant N,N-diisopropylethylenediamine (DPEA) was first used to prepa ...
DOI:
10.1016/j.bios.2019.01.057

22. Anchoring gold nanoparticles on poly(3,4-ethylenedioxythiophene) (PEDOT) nanonet as three-dimensional electrocatalysts toward ethanol and 2-propanol oxidation

Author:
Caiqin Wang; Ke Zhang; Hui Xu; Yukou Du; M. Cynthia Goh
Source:
Journal of colloid and interface science 2019 v.541 pp. 258-268
ISSN:
0021-9797
Subject:
carbon; catalysts; catalytic activity; clean energy; durability; electrodes; energy conversion; ethanol; fuels; gold; isopropyl alcohol; liquids; nanogold; oxidation
Abstract:
... Renewable alcohol oxidation is of vital significance for clean energy conversion and storage. Here, we fabricated a three-dimensional (3D) nanonet-like hybrid catalyst combining Au nanoparticles and poly(3,4-ethylenedioxythiophene) (PEDOT) together, in which PEDOT nanonets act as the framework of the 3D catalyst and the support for the dispersion of Au nanoparticles. The catalyst was designated as ...
DOI:
10.1016/j.jcis.2019.01.055

23. Aptamer-mediated colorimetric and electrochemical detection of Pseudomonas aeruginosa utilizing peroxidase-mimic activity of gold NanoZyme

Author:
Ritu Das; Abhijeet Dhiman; Arti Kapil; Vipul Bansal; Tarun Kumar Sharma
Source:
Analytical and bioanalytical chemistry 2019 v.411 no.6 pp. 1229-1238
ISSN:
1618-2642
Subject:
Pseudomonas aeruginosa; adsorption; carbon; colorimetry; electrochemistry; electrodes; gold; nanogold; oligonucleotides; oxidation; pathogens
Abstract:
... Despite of various advancements in biosensing, a rapid, accurate, and on-site detection of a bacterial pathogen is a real challenge due to the lack of appropriate diagnostic platforms. To address this unmet need, we herein report an aptamer-mediated tunable NanoZyme sensor for the detection of Pseudomonas aeruginosa, an infectious bacterial pathogen. Our approach exploits the inherent peroxidase-l ...
DOI:
10.1007/s00216-018-1555-z

24. Asymmetric aerobic oxidation of secondary alcohols catalyzed by poly(N-vinyl-2-pyrrolidone)-stabilized gold clusters modified with cyclodextrin derivatives

Author:
Koto Hirano; Shinjiro Takano; Tatsuya Tsukuda
Source:
Chemical communications 2019 v.55 no.100 pp. 15033-15036
ISSN:
1364-548X
Subject:
alcohols; catalytic activity; cyclodextrins; gold; oxidation
Abstract:
... Surface modification of poly(N-vinyl-2-pyrrolidone)-stabilized gold clusters (1.8 ± 0.6 nm) with aminated cyclodextrins induced aerobic oxidative kinetic resolution of racemic secondary alcohols (kᵣₑₗ = 1.2). ...
DOI:
10.1039/c9cc06770a

25. Au Nanobottles with Synthetically Tunable Overall and Opening Sizes for Chemo-Photothermal Combined Therapy

Author:
Han Zhang; Jianli Chen; Nannan Li; Ruibin Jiang; Xiao-Ming Zhu; Jianfang Wang
Source:
ACS applied materials & interfaces 2019 v.11 no.5 pp. 5353-5363
ISSN:
1944-8252
Subject:
coatings; doxorubicin; encapsulation; geometry; gold; nanogold; oxidation; photothermotherapy; wavelengths
Abstract:
... Highly asymmetric Au nanostructures, such as split Au nanorings and Au nanocups, exhibit attractive plasmonic properties because of their asymmetric geometries. To facilitate their plasmonic applications, effective and facile synthetic methods for producing asymmetric Au nanostructures with controllable sizes and uniform shapes are highly desirable. Herein, we report on an approach for the synthes ...
DOI:
10.1021/acsami.8b19163

26. Au-based bimetallic catalysts: how the synergy between two metals affects their catalytic activity

Author:
Jin Sha; Sébastien Paul; Franck Dumeignil; Robert Wojcieszak
Source:
RSC advances 2019 v.9 no.51 pp. 29888-29901
ISSN:
2046-2069
Subject:
X-ray photoelectron spectroscopy; catalysts; catalytic activity; copper; glucose; gold; nanoparticles; oxidation; palladium
Abstract:
... Supported bimetallic nanoparticles are particularly attractive catalysts due to increased activity and stability compared to their monometallic counterparts. In this work, gold-based catalysts have been studied as catalysts for the selective base-free oxidation of glucose. TiO₂-supported Au–Pd and Au–Cu series prepared by the sol-immobilization and precipitation-reduction methods, respectively, sh ...
DOI:
10.1039/c9ra06001d

27. Au/ERGO nanoparticles supported on Cu-based metal-organic framework as a novel sensor for sensitive determination of nitrite

Author:
Baoshan He; Dandan Yan
Source:
Food control 2019 v.103 pp. 70-77
ISSN:
0956-7135
Subject:
Fourier transform infrared spectroscopy; X-ray diffraction; coordination polymers; copper; detection limit; dielectric spectroscopy; electrochemistry; electrodes; gold; graphene oxide; nanogold; nanoparticles; nitrites; oxidation; scanning electron microscopy
Abstract:
... In this work, an electrode which comprises Au nanoparticles (AuNPs) and electrochemically reduced graphene oxide (ERGO) recombined Cu based metal-organic framework (Cu-TDPAT) was prepared for nitrite detection. The structure and constituent of the modified material were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and FT-IR. The electrochemical behavior of nitrite at ...
DOI:
10.1016/j.foodcont.2019.04.001

28. Au@CeO2 nanoparticles supported Pt/C electrocatalyst to improve the removal of CO in methanol oxidation reaction

Author:
Dung Van Dao; Ganpurev Adilbish; Thanh Duc Le; Thuy T.D. Nguyen; In-Hwan Lee; Yeon-Tae Yu
Source:
Journal of catalysis 2019 v.377 pp. 589-599
ISSN:
0021-9517
Subject:
carbon; catalysts; ceric oxide; commercialization; electrochemistry; electrophoresis; fuel cells; gold; methanol; nanoparticles; oxidation; platinum; renewable energy sources; soot; surface area
Abstract:
... Direct methanol fuel cells (DMFCs) are emerging as clean and renewable energy sources for global-scale sustainable energy solutions. However, several limitations of the current standard catalyst (platinum supported carbon black: Pt/C) prevent their commercialization. As an effective co-catalyst, Au@CeO2 core-shell structures are greatly advantageous for getting over the remaining hurdles of Pt/C i ...
DOI:
10.1016/j.jcat.2019.07.054

29. AuCu/CeO2 bimetallic catalysts for the selective oxidation of fatty alcohol ethoxylates to alkyl ether carboxylic acids

Author:
Q. Gu; W.-H. Fang; R. Wischert; W-J. Zhou; C. Michel; M. Pera-Titus
Source:
Journal of catalysis 2019 v.380 pp. 132-144
ISSN:
0021-9517
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; adsorption; alloys; carboxylic acids; catalysts; catalytic activity; ceric oxide; copper; copper nanoparticles; energy; engineering; fatty alcohols; gold; hydrogen peroxide; models; nanoceria; nanogold; oxidants; oxidation; polyethylene glycol; transmission electron microscopy
Abstract:
... We describe in this work the preparation of a series of bimetallic Au-Cu catalysts supported over nanoceria for the direct oxidation of C₁₂-C₁₄-alcohol polyethyleneglycol ether with on average 7 ethyl oxide units (AEO7) to polyoxyethylene lauryl ether carboxylic acid (AECA6), using H₂O₂ as an oxidant, under basic conditions. Different preparation methods have been used, including deposition-precip ...
DOI:
10.1016/j.jcat.2019.10.017

30. AuNCs-Catalyzed Hydrogen Selenide Oxidation: Mechanism and Application for Headspace Fluorescent Detection of Se(IV)

Author:
Jing Xiong; Kailai Xu; Xiandeng Hou; Peng Wu
Source:
Analytical chemistry 2019 v.91 no.9 pp. 6141-6148
ISSN:
1520-6882
Subject:
catalytic activity; density functional theory; energy; fluorescence; gold; headspace analysis; hydrides; hydrogen; nanogold; oxidation; oxygen; paper; selenides; selenium
Abstract:
... The excellent fluorescence property of Au nanoclusters (AuNCs) has received great attention for various chemosensing and biorelated applications, but the sample matrix is still an important problem that causes undesirable fluorescence variation. On the one hand, hydride generation (HG) is an effective strategy to separate the target analyte from the complex sample matrices, but the implementation ...
DOI:
10.1021/acs.analchem.9b00738

31. AuPd-nNiO as an effective catalyst for the base-free oxidation of HMF under mild reaction conditions

Author:
Danilo Bonincontro; Alice Lolli; Alberto Villa; Laura Prati; Nikolaos Dimitratos; Gabriel M. Veith; Lidia E. Chinchilla; Gianlugi A. Botton; Fabrizio Cavani; Stefania Albonetti
Source:
Green chemistry 2019 v.21 no.15 pp. 4090-4099
ISSN:
1463-9270
Subject:
alloys; catalysts; dicarboxylic acids; gold; green chemistry; hydroxymethylfurfural; nanoparticles; nickel oxide; oxidants; oxidation; oxygen; palladium; synergism
Abstract:
... Au-Based catalysts supported on nanosized NiO (nNiO) were synthesized and were investigated in the oxidation of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA) under base-free conditions using molecular oxygen as the oxidant, at 90 °C. By choosing the optimal composition of Au–Pd nanoparticles (6 : 4 Au/Pd atomic ratio), we report an efficient and stable nNiO-supported Au–Pd all ...
DOI:
10.1039/c9gc01283d

32. Au–Pd alloy cooperates with covalent triazine frameworks for the catalytic oxidative cleavage of β-O-4 linkages

Author:
Li Zhao; Song Shi; Guozhi Zhu; Meng Liu; Jin Gao; Jie Xu
Source:
Green chemistry 2019 v.21 no.24 pp. 6707-6716
ISSN:
1463-9270
Subject:
alloys; aromatic compounds; catalysts; catalytic activity; chemical bonding; depolymerization; gold; green chemistry; lignin; models; nanoparticles; oxidation; oxygen; palladium; synergism; triazines
Abstract:
... To design highly efficient catalysts for the cleavage of the C–O/C–C bond is the key task in the depolymerization of lignin. Bimetallic alloy catalysts Au–Pd-CTFs were developed to be effective in the oxidative cleavage of β-O-4 lignin model compounds with O₂. Au–Pd nanoparticles with an Au/Pd molar ratio between 1 : 1 and 1 : 1.5 showed the highest cleavage efficiency. The kinetics of the reactio ...
DOI:
10.1039/c9gc03081f

33. Bifunctional electrocatalysis for CO₂ reduction via surface capping-dependent metal–oxide interactions

Author:
Yueshen Wu; Xiaolei Yuan; Zixu Tao; Hailiang Wang
Source:
Chemical communications 2019 v.55 no.60 pp. 8864-8867
ISSN:
1364-548X
Subject:
carbon dioxide; carbon monoxide; catalysts; catalytic activity; cetyltrimethylammonium bromide; chemical interactions; citrates; electrochemistry; formates; gold; hydrogen; hydrogen production; ligands; nanogold; oxidation; tin dioxide
Abstract:
... Multi-component materials are a new trend in catalyst development for electrochemical CO₂ reduction. Understanding and managing the chemical interactions within a complex catalyst structure may unlock new or improved reactivity, but is scientifically challenging. We report the first example of capping ligand-dependent metal–oxide interactions in Au/SnO₂ structures for electrocatalytic CO₂ reductio ...
DOI:
10.1039/c9cc02934f

34. Bio-Based Chemicals: Selective Aerobic Oxidation of Tetrahydrofuran-2,5-dimethanol to Tetrahydrofuran-2,5-dicarboxylic Acid Using Hydrotalcite-Supported Gold Catalysts

Author:
Qingqing Yuan; Kevin Hiemstra; Tim G. Meinds; Ibrahim Chaabane; Zhenchen Tang; Leon Rohrbach; Wilbert Vrijburg; Tiny Verhoeven; Emiel J. M. Hensen; Siebe van der Veer; Paolo P. Pescarmona; Hero J. Heeres; Peter J. Deuss
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.5 pp. 4647-4656
ISSN:
2168-0485
Subject:
adsorption; atmospheric pressure; carboxylic acids; catalysts; furfural; gold; hydrogenation; hydrotalcite; hydroxymethylfurfural; industry; nanogold; oxidation; polymers; temperature
Abstract:
... A new, sustainable catalytic route for the synthesis of tetrahydrofuran-2,5-dicarboxylic acid (THFDCA), a compound with potential application in polymer industry, is presented starting from the bio-based platform chemical 5-(hydroxymethyl)furfural (HMF). This conversion was successfully achieved via oxidation of tetrahydrofuran-2,5-dimethanol (THFDM) over hydrotalcite (HT)-supported gold nanoparti ...
DOI:
10.1021/acssuschemeng.8b03821

35. Bio-oxidation of refractory gold ores containing stibnite and gudmundite

Author:
Liliane Coelho de Carvalho; Suzimara Reis da Silva; Romeu Marra Neto Giardini; Luciana Faria C. de Souza; Versiane Albis Leão
Source:
Environmental technology & innovation 2019 v.15 pp. 100390
ISSN:
2352-1864
Subject:
Acidithiobacillus ferrooxidans; antimony; arsenic; bioleaching; environmental technology; gold; mining; oxidation; pH; pollutants; skin neoplasms; sulfide minerals; sulfides
Abstract:
... Arsenic and antimony are environmental pollutants associated with several diseases, including skin cancer. One of the main sources of both elements is the oxidation of sulphide minerals, particularly arsenopyrite and therefore any of both elements is a concern in gold mining operations because arsenic- and antimony-bearing sulphides may contain significant gold contents. Bioleaching is considered ...
DOI:
10.1016/j.eti.2019.100390

36. Boosting levulinic acid hydrogenation to value-added 1,4-pentanediol using microwave-assisted gold catalysis

Author:
F. Bucciol; S. Tabasso; G. Grillo; F. Menegazzo; M. Signoretto; M. Manzoli; G. Cravotto
Source:
Journal of catalysis 2019 v.380 pp. 267-277
ISSN:
0021-9517
Subject:
catalysts; catalytic activity; gold; hydrogen; hydrogenation; levulinic acid; microwave treatment; nanogold; oxidation; titanium dioxide; value added; zirconium oxide
Abstract:
... Microwave (MW) -assisted levulinic acid (LA) hydrogenation has been performed over two gold catalysts (commercial 1 wt% Au/TiO₂ by AUROlite™ and 2.5 wt% Au/ZrO₂, prepared using deposition-precipitation). MW-assisted LA hydrogenation was carried out in water and in solvent-free conditions via (i) H-transfer and (ii) molecular H₂. Au/TiO₂ promoted complete LA conversion and the further reduction of ...
DOI:
10.1016/j.jcat.2019.09.041

37. Carbon vacancy defect-activated Pt cluster for hydrogen generation

Author:
Xiaobing Bao; Yutong Gong; Yuzhuo Chen; Hao Zhang; Zhe Wang; Shanjun Mao; Lei Xie; Zheng Jiang; Yong Wang
Source:
Journal of materials chemistry A 2019 v.7 no.25 pp. 15364-15370
ISSN:
2050-7496
Subject:
carbon; carbon nanotubes; catalysts; electrochemistry; gold; hydrogen production; oxidation; palladium; platinum
Abstract:
... Providing specific accommodation for supported metal clusters on the defective sites of supports is vital to disclose the function mechanism of the structural defects on metals and the fabrication of excellent catalysts. Here, stable platinum-group metal clusters (Pt, Pd and Au) trapped by structure defects within carbon nanotubes (CNTs) were fabricated with a simple and scalable in situ electroch ...
DOI:
10.1039/c9ta04010b

38. Catalysis of Au nano-pyramids formed across the surfaces of ordered Au nano-ring arrays

Author:
Xun Cao; Chaojiang Li; Yu Lu; Bowei Zhang; Yu Wu; Qing Liu; Junsheng Wu; Jiao Teng; Weiguo Yan; Yizhong Huang
Source:
Journal of catalysis 2019 v.377 pp. 389-399
ISSN:
0021-9517
Subject:
active sites; catalytic activity; electrochemistry; energy; ethanol; fuel cells; gold; nanogold; nanospheres; oxidation; oxygen; pH
Abstract:
... Gold (Au) is a noble metal that has been widely researched due to its high catalytic performance-to-cost ratio. The catalysis could be improved by fabrication of nanostructured arrays on Au thin film with a large area. In the present paper, a facile NSL-RIE approach comprising of nanosphere lithography followed by oxygen plasma reactive ion etching has been developed to fabricate ordered Au nano-r ...
DOI:
10.1016/j.jcat.2019.07.038

39. Catalytic Conversion of Chitosan to Glucosaminic Acid by Tandem Hydrolysis and Oxidation

Author:
Jinhang Dai; Gökalp Gözaydın; Changwei Hu; Ning Yan
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.14 pp. 12399-12407
ISSN:
2168-0485
Subject:
activated carbon; amino acids; catalysts; catalytic activity; chitin; chitosan; glucosamine; gold; hydrolysates; hydrolysis; magnesium oxide; oxidation; polymers; value added
Abstract:
... Effective conversion of chitin or its derivatives (i.e., chitosan) to value-added organonitrogen compounds is a promising strategy to valorize chitin. Glucosaminic acid (GlcNA) is an important amino acid derived from chitosan. In this work, we demonstrate the feasibility of GlcNA production from chitosan by tandem hydrolysis and oxidation reactions without isolating glucosamine (GlcN) intermediate ...
DOI:
10.1021/acssuschemeng.9b01912

40. Colorimetric determination of Hg2+ in environmental water based on the Hg2+-stimulated peroxidase mimetic activity of MoS2-Au composites

Author:
Chunmeng Ma; Yao Ma; Yifan Sun; Yuan Lu; Enlin Tian; Jingfeng Lan; Jialu Li; Weichun Ye; Haixia Zhang
Source:
Journal of colloid and interface science 2019 v.537 pp. 554-561
ISSN:
0021-9797
Subject:
X-ray photoelectron spectroscopy; cations; colorimetry; detection limit; enzyme kinetics; gold; hydrogen peroxide; mercury; microwave treatment; molybdenum disulfide; nanogold; nanosheets; oxidation; peroxidase; river water; surface area; tap water; Yellow River
Abstract:
... A colorimetric assay is described for sensitive determination of Hg²⁺ ions based on the MoS₂-Au composites as peroxidase mimetics, which are synthesized by microwave-assisted solvothermal method. The addition of Hg²⁺ stimulates their peroxidase-like activity, along with lower Michaelis constant toward the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with H₂O₂, allowing the composites for dire ...
DOI:
10.1016/j.jcis.2018.11.069

41. Comparison of radical-driven technologies applied for paraben mixture degradation: mechanism, biodegradability, toxicity and cost assessment

Author:
Marta Gmurek; João F. Gomes; Rui C. Martins; Rosa M. Quinta-Ferreira
Source:
Environmental science and pollution research international 2019 v.26 no.36 pp. 37174-37192
ISSN:
0944-1344
Subject:
4-hydroxybenzoic acid; Corbicula fluminea; Lepidium sativum; Vibrio fischeri; X-ray diffraction; X-ray photoelectron spectroscopy; biodegradability; bisphenol A; catalysts; cosmetics; cost analysis; endocrine-disrupting chemicals; esters; gold; hydrogen peroxide; hydroxyl radicals; iron; light; mineralization; oxidants; oxidation; ozonation; ozone; palladium; photocatalysis; platinum; scanning electron microscopy; silver; solar radiation; titanium dioxide; toxicity; ultraviolet radiation; wastewater; wastewater treatment
Abstract:
... Parabens (esters of p-hydroxybenzoic acid) are xenobiosis belonging to endocrine disruptors and commonly used as a preservative in cosmetics, food, pharmaceutical, and personal care products. Their wide use is leading to their appearance in water and wastewater in the range from ng/L to mg/L. In fact, the toxicity of benzylparaben is comparable to bisphenol A. Therefore, it is important to find no ...
DOI:
10.1007/s11356-019-06703-9
PubMed:
31749006
PubMed Central:
PMC6937227

42. Compressive Strain in Core–Shell Au–Pd Nanoparticles Introduced by Lateral Confinement of Deformation Twinnings to Enhance the Oxidation Reduction Reaction Performance

Author:
Chenshuo Wu; Hong Li; Hongpeng He; Yahui Song; Cuixia Bi; Wei Du; Haibing Xia
Source:
ACS applied materials & interfaces 2019 v.11 no.50 pp. 46902-46911
ISSN:
1944-8252
Subject:
adsorption; catalysts; catalytic activity; compression strength; copper; deformation; desorption; electrochemistry; ethanol; gold; ions; nanogold; nanoparticles; oxidation; palladium
Abstract:
... In this work, quasi-spherical, uniform gold nanoparticles with rich deformation twinning (Audₜ NPs) were first synthesized with the assistance of copper(II) ions. Then, these Audₜ NPs were used as the cores for the fabrication of core–shell (CS) Audₜ–Pd NPs with ultrathin Pd layers, which also can bear compressive strain because of the formation of corrugated structured Pd shells led by the latera ...
DOI:
10.1021/acsami.9b16994

43. Control of Potential Response to Small Biomolecules with Electrochemically Grafted Aryl-Based Monolayer in Field-Effect Transistor-Based Sensors

Author:
Shogo Himori; Shoichi Nishitani; Toshiya Sakata
Source:
Langmuir 2019 v.35 no.10 pp. 3701-3709
ISSN:
1520-5827
Subject:
biochemical compounds; diazonium compounds; electrochemistry; electrodes; free radicals; gold; oxidation; transistors; uric acid
Abstract:
... In this paper, we demonstrate the use of a monolayer film electrografted via diazonium chemistry for controlling the potential response of a field-effect transistor (FET)-based sensor. 4-Nitrobenzenediazonium salt is electrografted on an extended-Au-gate FET (EG-Au-FET) with or without using a radical scavenger by cyclic voltammetry (CV), resulting in the formation of a monolayer or multilayer. In ...
DOI:
10.1021/acs.langmuir.9b00085

44. Controlled Enhancement in Hole Injection at Gold-Nanoparticle-on-Organic Electrical Contacts Fabricated by Spark-Discharge Aerosol Technique

Author:
Jongcheon Lee; Hyungchae Kim; Kyuhee Han; Yongmoon Lee; Mansoo Choi; Changsoon Kim
Source:
ACS applied materials & interfaces 2019 v.11 no.6 pp. 6276-6282
ISSN:
1944-8252
Subject:
X-ray photoelectron spectroscopy; aerosols; ambient temperature; electric current; electrodes; gold; nanogold; oxidation; semiconductors
Abstract:
... We demonstrate that hole injection from a top electrode composed of Au nanoparticles (AuNPs) capped with a thick Au layer into an underlying organic semiconductor, N,N′-diphenyl-N,N′-bis-[4-(phenyl-m-tolyl-amino)-phenyl]-biphenyl-4,4′-diamine (DNTPD), is significantly enhanced compared to that in a control device whose top electrode is composed entirely of a thick Au layer. The fabrication of this ...
DOI:
10.1021/acsami.8b16303

45. Controlled synthesis of Au@Pd core-shell nanocomposites and their application for electrochemical sensing of hydroquinone

Author:
Tingting Chen; Jinqiong Xu; Muhammad Arsalan; Qinglin Sheng; Jianbin Zheng; Wei Cao; Tianli Yue
Source:
Talanta 2019 v.198 pp. 78-85
ISSN:
0039-9140
Subject:
chemical reduction; electrochemistry; environmental monitoring; glassy carbon electrode; gold; hydroquinone; lakes; nanocomposites; nanogold; nanorods; oxidation; sensors (equipment); tap water; transmission electron microscopy
Abstract:
... In this study, a facile and effective method for the synthesis of Au@Pd nanocomposites via a chemical reduction method was proposed. Moreover, a novel electrochemical sensor based on the Au@Pd core-shell nanocomposites were constructed and used for detection of hydroquinone (HQ). The morphologies and structures of Au nanorods (NRs) and Au@Pd nanomaterials were characterized by transmission electro ...
DOI:
10.1016/j.talanta.2019.01.094

46. Crystallization Retardation of Ultrathin Films of Poly[(R)-3-hydroxybutyrate] and a Random Copolymer Poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] on an Aluminum Oxide Surface

Author:
Changhao Liu; Isao Noda; D. Bruce Chase; Yuying Zhang; Jing Qu; Meng Jia; Chaoying Ni; John F. Rabolt
Source:
Macromolecules 2019 v.52 no.19 pp. 7343-7352
ISSN:
1520-5835
Subject:
X-ray diffraction; air; aluminum; aluminum oxide; ambient temperature; biodegradability; composite polymers; crystallites; crystallization; gold; hydrogen bonding; oxidation; spectroscopy; wide-angle X-ray scattering
Abstract:
... Ultrathin films of biodegradable poly[(R)-3-hydroxybutyrate] (PHB) and its random copolymer poly[(R)-3-hydroxybutyrate-co-(R)-3-hydroxyhexanoate] (PHBHx) were prepared by spin-coating onto aluminum substrates with a naturally oxidized aluminum oxide (AO) surface layer or, alternatively, on gold substrates. The opposite surface of the film was in contact with ambient air. Isothermal crystallization ...
DOI:
10.1021/acs.macromol.9b01214

47. Cu@Au(Ag)/Pt nanocomposite as peroxidase mimic and application of Cu@Au/Pt in colorimetric detection of glucose and l-cysteine

Author:
Cuifeng Jiang; Xiaoxiu Wei; Shuai Bao; Huajian Tu; Wei Wang
Source:
RSC advances 2019 v.9 no.71 pp. 41561-41568
ISSN:
2046-2069
Subject:
absorbance; bioassays; biocatalysis; color; colorimetry; copper; cysteine; detection limit; diabetes; fetal bovine serum; glucose; gold; hydrogen peroxide; nanocomposites; nanosilver; oxidation; peroxidase; platinum; silver
Abstract:
... Nanomaterial-based artificial peroxidase has attracted extensive interests due to their distinct advantages over natural counterpart. Cu@Au/Pt and Cu@Ag/Pt nanocomposite with rambutan-like structure were prepared and discovered to function like peroxidase, which was illustrated by catalyzing the oxidation reaction of 3,3′,5,5′-tetramethylbenzidine (TMB) accompanied with a blue color change. Steady ...
DOI:
10.1039/c9ra08547e

48. Cyanobacteria as Nanogold Factories II: Chemical Reactivity and anti-Myocardial Infraction Properties of Customized Gold Nanoparticles Biosynthesized by Cyanothece sp.

Author:
Nancy S. Younis; Esam M. Bakir; Maged E. Mohamed; Nermin A. El Semary
Source:
Marine drugs 2019 v.17 no.7 pp. -
ISSN:
1660-3397
Subject:
Cyanothece; absorption; biosynthesis; gold; light scattering; myocardial infarction; nanogold; nanoparticles; nitrogen fixation; oxidation; rats
Abstract:
... Cyanothece sp., a coccoid, unicellular, nitrogen-fixing and hydrogen-producing cyanobacterium, has been used in this study to biosynthesize customized gold nanoparticles under certain chemical conditions. The produced gold nanoparticles had a characteristic absorption band at 525–535 nm. Two types of gold nanoparticle, the purple and blue, were formed according to the chemical environment in ...
DOI:
10.3390/md17070402
PubMed:
31288394
PubMed Central:
PMC6669522

49. Deciphering Charge Transfer and Electronic Polarization Effects at Gold Nanocatalysts on Reduced Titania Support

Author:
Su-Hyun Yoo; Niklas Siemer; Mira Todorova; Dominik Marx; Jörg Neugebauer
Source:
Journal of physical chemistry 2019 v.123 no.9 pp. 5495-5506
ISSN:
1932-7455
Subject:
catalysts; catalytic activity; density functional theory; electron transfer; gold; molecular dynamics; nanogold; oxidation; oxygen; semiconductors; simulation models; titanium dioxide
Abstract:
... Gold nanoparticles supported on reduced TiO₂ (110) surfaces are widely used as catalysts for oxidation reactions. Despite extensive studies, the role of oxygen vacancies in such systems remains elusive and is controversially discussed. Combining ab initio molecular dynamics simulations with methods originally developed to describe defects in semiconductor physics we study how the electronic charge ...
DOI:
10.1021/acs.jpcc.8b12015

50. Deciphering the origin of variation in the spin ground state and oxidation state of a {Mn₁₉} cluster on a Au(111) surface: is the Au(111) surface innocent?

Author:
Rizwan Nabi; Gopalan Rajaraman
Source:
Chemical communications 2019 v.55 no.57 pp. 8238-8241
ISSN:
1364-548X
Subject:
ferrimagnetic materials; gold; ions; oxidation
Abstract:
... Periodic DFT calculations on a {Mn₁₉} cluster possessing S = 83/2 ground state and its reduced variant on a Au(111) surface unravel the importance of structural distortions that triggered drastic variations in the J values leading to a large reduction in the spin ground state. Reduction of Mnᴵᴵᴵ ions leads to antiferromagnetic Js with a very small spin ground state manifesting the non-innocent beh ...
DOI:
10.1039/c9cc03714d

51. Descriptor for the Efficacy of Aliovalent Doping of Oxides and Its Application for the Charging of Supported Au Clusters

Author:
Sukanya Ghosh; Nisha Mammen; Shobhana Narasimhan
Source:
Journal of physical chemistry 2019 v.123 no.32 pp. 19794-19805
ISSN:
1932-7455
Subject:
aluminum; catalysts; cations; databases; density functional theory; gold; lithium; magnesium oxide; oxidation; physical chemistry; sodium
Abstract:
... We have studied aliovalent doping of oxides, which is central to many applications in technology, using density functional theory (DFT). We consider the following anionic/cationic donor/acceptor dopants in MgO: Al, F, N, P, Li, Na, and K. Not all dopants donate or accept charge to the full extent expected from their nominal oxidation state. Counterintuitively, the charge accepted/donated by a dopa ...
DOI:
10.1021/acs.jpcc.9b06119

52. Design of catalytically active porous gold structures from a bottom-up method: The role of metal traces in CO oxidation and oxidative coupling of methanol

Author:
Cansunur Demirci; Sergio Marras; Mirko Prato; Lea Pasquale; Liberato Manna; Massimo Colombo
Source:
Journal of catalysis 2019 v.375 pp. 279-286
ISSN:
0021-9517
Subject:
carbon monoxide; catalysts; catalytic activity; cryogelation; freeze drying; gold; liquids; metal ions; methanol; nanogold; nanoparticles; nanopores; nitrogen; oxidation; sodium
Abstract:
... By using a bottom-up approach, we prepared 3D self-supported porous structures made of gold nanoparticles and applied them as oxidation catalysts. To do so we used the established cryogelation technique, in which nanoparticle units were frozen in liquid nitrogen and the ice-template was subsequently sublimated by a freeze-drying process, resulting in a 3D self-standing monolith of nanoparticles. T ...
DOI:
10.1016/j.jcat.2019.06.016

53. Designing and fabrication of new VIP biosensor for the rapid and selective detection of foot-and-mouth disease virus (FMDV)

Author:
Heba A. Hussein; Rabeay Y.A. Hassan; Rasha Mohamed El Nashar; Samy A. Khalil; Sayed A. Salem; Ibrahim M. El-Sherbiny
Source:
Biosensors & bioelectronics 2019 v.141 pp. 111467
ISSN:
0956-5663
Subject:
Foot-and-mouth disease virus; Fourier transform infrared spectroscopy; Lumpy skin disease virus; atomic force microscopy; biosensors; cross reaction; detection limit; diagnostic techniques; electrochemistry; electrodes; enzyme-linked immunosorbent assay; gold; monitoring; oxidation; polymerase chain reaction; polymerization; polymers; saliva; scanning electron microscopy; serotypes; variance; viruses
Abstract:
... Foot and mouth disease virus (FMDV), is a highly contagious virus due to its ease of transmission. FMDV has seven genetically distinguished serotypes with many subtypes within each serotype. The traditional diagnostic methods of FMDV have demonstrated many drawbacks related to sensitivity, specificity, and cross-reactivity. In the current study, a new viral imprinted polymer (VIP)-based biosensor ...
DOI:
10.1016/j.bios.2019.111467

54. Determination of the available acid-generating potential of waste rock, part II: Waste management involvement

Author:
A. Elghali; M. Benzaazoua; B. Bussière; H. Bouzahzah
Source:
Applied geochemistry 2019 v.100 pp. 316-325
ISSN:
0883-2927
Subject:
automation; calcium; carbonates; economic costs; geochemistry; gold; iron; leachates; leaching; mineralogy; mining; oxidation; pH; particle size distribution; screening; sulfides; sulfur; texture; waste management; wastes; zinc
Abstract:
... Open-pit mining operations often produce large amounts of waste rock that are characterized by large particle size distributions (PSD). Waste rock are normally deposited in surface piles that contain grains varying from a few microns to meters in size. Furthermore, the mineralogical and textural properties of the waste rock are influenced by their PSD. The diameter of physical locking of sulfides ...
DOI:
10.1016/j.apgeochem.2018.12.010

55. Determination of ultra-low volatile mercury concentrations in sulfur-rich gases and liquids

Author:
Christoph-Cornelius Brombach; Thomas Pichler
Source:
Talanta 2019 v.199 pp. 277-284
ISSN:
0039-9140
Subject:
acid mine drainage; cold; emissions; flue gas; fluorescence emission spectroscopy; gold; groundwater; hydrogen; hydrogen sulfide; landfills; liquids; mercury; methane; natural gas; oxidation; potassium permanganate; reducing agents; sodium borohydride; sulfur dioxide; sulfuric acid; vapors
Abstract:
... Determining mercury (Hg) concentrations in a wide range of naturally occurring liquids (i.e., groundwater, hydrothermal fluids, acid mine drainage, submarine groundwater discharge, etc.) and gases, (i.e., volcanic and hydrothermal emissions, flue gas, natural gas, land fill gas, etc.) has obstacles due to the presence of H2S in many of such samples. The classical approach of trapping Hg on gold tr ...
DOI:
10.1016/j.talanta.2019.02.070

56. Direct 12-Electron Oxidation of Ethanol on a Ternary Au(core)-PtIr(Shell) Electrocatalyst

Author:
Zhixiu Liang; Liang Song; Shiqing Deng; Yimei Zhu; Eli Stavitski; Radoslav R. Adzic; Jingyi Chen; Jia X. Wang
Source:
Journal of the American Chemical Society 2019 v.141 no.24 pp. 9629-9636
ISSN:
1520-5126
Subject:
adsorption; alloys; carbon monoxide; catalysts; catalytic activity; chemical bonding; dehydrogenation; electrochemistry; ethanol; gold; iridium; oxidation; platinum; poisoning; spectral analysis; tensile strength
Abstract:
... Understanding the roles of metals and atomic structures in activating various elementary steps of electrocatalytic reactions can help rational design of binary or ternary catalysts for promoting activity toward desirable products via favorable pathways. Here we report on a newly developed ternary Au@PtIr core–shell catalyst for ethanol oxidation reaction (EOR) in alkaline solutions, which exhibits ...
DOI:
10.1021/jacs.9b03474

57. Discovering new M-quinolate materials: theoretical insight into understanding the charge transport, electronic, self-aggregation properties in M-quinolate materials (M = Li, Na, K, Rb, Cs, Cu, Ag, and Au)

Author:
Sang Ho Jeon; Young Mi Cho; Taekyung Kim; Sunwoo Kang
Source:
Journal of materials science 2019 v.54 no.13 pp. 9523-9532
ISSN:
0022-2461
Subject:
cesium; copper; density functional theory; dimerization; gold; lithium; metal ions; oxidation; potassium; rubidium; silver; sodium
Abstract:
... A series of M-quinolate complexes were theoretically investigated to understand the effect of metal ions on electronic and charge transport properties by employing density functional theory simulation. It was found that both electronic and carrier transport properties in M-quinolate materials significantly depend on singly oxidized metal ions. In particular, Csq apparently showed an excellent adva ...
DOI:
10.1007/s10853-019-03584-8

58. Distribution and sources of trace element pollutants in the sediments of the industrialised Port Kembla Harbour, New South Wales, Australia

Author:
Brian G. Jones; Yasir M. Alyazichi; Christina Low; Angela Goodfellow; Bryan E. Chenhall; R. John Morrison
Source:
Environmental earth sciences 2019 v.78 no.12 pp. 357
ISSN:
1866-6280
Subject:
alkalinity; antimony; aquatic environment; arsenic; automobiles; basins; bedrock; carbon; clay; coal; cobalt; copper; dredging; dust; fly ash; gold; industrial sites; industrialization; iron; lead; organic matter; oxidation; particulates; pollutants; pyrite; sand; sediment contamination; selenium; shipping; silt; streams; zinc; New South Wales
Abstract:
... A detailed geochemical analysis of sediment samples from the heavily industrialised Port Kembla Harbour, 70 km south of Sydney in New South Wales, Australia, has delineated areas that are heavily contaminated with trace element pollutants. Local creek delta sand accumulations, basin mud deposits, reclamation deposits and exposed bedrock on the present harbour floor are consistent with the twentiet ...
DOI:
10.1007/s12665-019-8358-1

59. Donor/Acceptor-Induced Ratiometric Photoelectrochemical Paper Analytical Device with a Hollow Double-Hydrophilic-Walls Channel for microRNA Quantification

Author:
Hongmei Yang; Mengsu Hu; Zhenglin Li; Peini Zhao; Li Xie; Xianrang Song; Jinghua Yu
Source:
Analytical chemistry 2019 v.91 no.22 pp. 14577-14585
ISSN:
1520-6882
Subject:
DNA; catalytic activity; cathodes; cuprous oxide; dissolved oxygen; electric current; electrochemistry; electrostatic interactions; glucose; glucose oxidase; gold; graphene; hybridization chain reaction; hydrogen peroxide; mass transfer; microRNA; microfluidic technology; nanogold; nanosheets; oxidation; paper; photochemistry; polymers; quantum dots; selenides; silver sulfide; zinc oxide
Abstract:
... Integrating ratiometric photoelectrochemical (PEC) techniques with paper microfluidics to construct a ratiometric PEC paper analytical device for practical application is often restricted by the grave dependence of ratiometric assay on photoactive materials and low mass-transfer rates of the paper channel. Herein, a universal donor/acceptor-induced ratiometric PEC paper analytical device with a ho ...
DOI:
10.1021/acs.analchem.9b03638

60. Doping of Nb⁵⁺ Species at the Au–TiO₂ Interface for Plasmonic Photocatalysis Enhancement

Author:
Yasuhiro Shiraishi; Jun Imai; Naoki Yasumoto; Hirokatsu Sakamoto; Shunsuke Tanaka; Satoshi Ichikawa; Takayuki Hirai
Source:
Langmuir 2019 v.35 no.16 pp. 5455-5462
ISSN:
1520-5827
Subject:
absorption; acidity; catalysts; electrons; gold; irradiation; light; nanogold; niobium; oxidation; photocatalysis; semiconductors; surface plasmon resonance; titanium dioxide
Abstract:
... Au nanoparticles loaded on semiconductor TiO₂ absorb visible light due to their surface plasmon resonance (SPR) and inject the photogenerated hot electrons (eₕₒₜ–) into the conduction band of TiO₂. The separated charges promote oxidation and reduction reactions. The step that determines the rate of the plasmonic photocatalysis on the Au/TiO₂ system is the eₕₒₜ– injection through the Schottky barri ...
DOI:
10.1021/acs.langmuir.8b04075

61. Dual Signal Amplification by eATRP and DNA-Templated Silver Nanoparticles for Ultrasensitive Electrochemical Detection of Nucleic Acids

Author:
Haobo Sun; Jinming Kong; Qiangwei Wang; Qianrui Liu; Xueji Zhang
Source:
ACS applied materials & interfaces 2019 v.11 no.31 pp. 27568-27573
ISSN:
1944-8252
Subject:
aldehydes; biomarkers; blood serum; detection limit; electrochemistry; electrodes; genes; gold; nanosilver; oxidation; peptides; phosphates; polymerization; polysaccharides; silver; thiols; transfer DNA
Abstract:
... Herein, an ultrasensitive and novel platform for DNA detection is reported, which combines DNA-templated silver nanoparticles (AgNPs) with electrochemical atom transfer radical polymerization signal amplification. Peptide nucleic acid (PNA) functionalized with thiol was modified to the Au electrode surface as a probe to specifically capture target DNA (T-DNA). After Zr⁴⁺ binds to phosphate on DNA, ...
DOI:
10.1021/acsami.9b08037

62. Dual responsive magnetic Au@Ni nanostructures loaded reduced graphene oxide sheets for colorimetric detection and photocatalytic degradation of toxic phenolic compounds

Author:
Gitashree Darabdhara; Manash R. Das
Source:
Journal of hazardous materials 2019 v.368 pp. 365-377
ISSN:
0304-3894
Subject:
2-chlorophenol; colorimetry; detection limit; gold; graphene oxide; irradiation; magnetism; nanocomposites; nanogold; nanoparticles; nickel; nitrophenols; oxidation; peroxidase; photocatalysis; pollutants; solar radiation; toxicity
Abstract:
... We report the colorimetric detection and photocatalytic degradation of toxic phenolic compounds using Au@Ni loaded reduced graphene oxide (rGO) nanostructures. Core-shell nanoparticles of Au and Ni are successfully designed on rGO with size <8 nm by a solvothermal route which demonstrate excellent enzyme mimic behaviour towards the oxidation of 3,3ʹ,5,5ʹ tetramethylbenzidine (TMB), a peroxidase su ...
DOI:
10.1016/j.jhazmat.2019.01.010

63. Dual-signal amplification strategy for miRNA sensing with high sensitivity and selectivity by use of single Au nanowire electrodes

Author:
Haoran Tang; Jiahui Zhu; Dongmei Wang; Yongxin Li
Source:
Biosensors & bioelectronics 2019 v.131 pp. 88-94
ISSN:
0956-5663
Subject:
DNA; DNA probes; biomarkers; biosensors; dissociation; early diagnosis; electrodes; gold; magnesium; microRNA; nanogold; nanowires; neoplasms; oligonucleotides; organelles; oxidation
Abstract:
... MicroRNAs (miRNAs) have been applied as biomarkers and better detection of their expression profiles plays important roles in early diagnosis of cancers. In this work, a simple dual-signal amplification strategy has been used to construct a novel nanosensor on single Au nanowire electrodes (SAuNWEs) for miRNA-16 detection based on the “signal-on” and “signal-off” features during hybridization/de-h ...
DOI:
10.1016/j.bios.2019.02.023

64. Economic Sulfur Conversion to Functional Polythioamides through Catalyst-Free Multicomponent Polymerizations of Sulfur, Acids, and Amines

Author:
Wenxia Cao; Fengying Dai; Rongrong Hu; Ben Zhong Tang
Source:
Journal of the American Chemical Society 2019 v.142 no.2 pp. 978-986
ISSN:
1520-5126
Subject:
burning; diamines; dicarboxylic acids; electronic wastes; gold; leaching; molecular weight; oxidation; polymerization; polymers; pyrolysis; refractive index; semiconductors; sulfur
Abstract:
... Sulfur utilization is a global concern because of its abundant nature sources and the safety or environmental problems caused by its burning or oxidation during storage, while sulfur-containing polymers are popular materials in virtue of their fascinating properties such as metal coordination ability, high refractive indices, and semiconducting property. The synthesis of sulfur-containing polymers ...
DOI:
10.1021/jacs.9b11066

65. Effect of Structural Evolution of Gold Species Supported on Ceria in Catalyzing CO Oxidation

Author:
Xiu-Ling Wang; Xin-Pu Fu; Wei-Wei Wang; Chao Ma; Rui Si; Chun-Jiang Jia
Source:
Journal of physical chemistry 2019 v.123 no.14 pp. 9001-9012
ISSN:
1932-7455
Subject:
adsorption; ambient temperature; carbon monoxide; catalysts; catalytic activity; gold; infrared spectroscopy; nanogold; oxidation; reflectance; transmission electron microscopes
Abstract:
... The intrinsic reactivity of atomically dispersed gold catalysts for low-temperature (L-T) CO oxidation remains an elusive issue. Here, two kinds of atomically dispersed gold with different loadings supported on nanoceria prepared via a deposition precipitation method were evaluated as catalysts for L-T CO oxidation. Much distinct differences in catalyzing CO oxidation behaviors were exhibited on t ...
DOI:
10.1021/acs.jpcc.9b00096

66. Effect of gold addition by the recharge method on silver supported catalysts in the catalytic wet air oxidation (CWAO) of phenol

Author:
Adib A. Silahua-Pavón; Gilberto Torres-Torres; Juan Carlos Arévalo-Pérez; Adrián Cervantes-Uribe; Zenaida Guerra-Que; Adrián Cordero-García; Alejandra Espinosa de los Monteros; Jorge N. Beltramini
Source:
RSC advances 2019 v.9 no.20 pp. 11123-11134
ISSN:
2046-2069
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; acetic acid; air; byproducts; catalysts; catalytic activity; ceric oxide; cerium; gold; nitrogen; oxalic acid; oxidation; phenol; silver; species abundance; transmission electron microscopy; zirconium oxide
Abstract:
... Catalysts Ag/ZrO₂–CeO₂ and Au/ZrO₂–CeO₂ were synthesized by a deposition–precipitation method and Ag–Au/ZrO₂–CeO₂ was prepared using a recharge method for the second metal (Au). The materials were characterized by physisorption of N₂, XRD, ICP, UV-vis RDS, H2-TPR, XPS and TEM. The results obtained show that the specific areas for monometallic materials were 29–37 m² g⁻¹ and 27–74 m² g⁻¹ for bimeta ...
DOI:
10.1039/c9ra00540d

67. Efficient imine synthesis from oxidative coupling of alcohols and amines under air atmosphere catalysed by Zn-doped Al2O3 supported Au nanoparticles

Author:
Shipeng Wu; Weixiao Sun; Junjie Chen; Jinghan Zhao; Qiue Cao; Wenhao Fang; Qihua Zhao
Source:
Journal of catalysis 2019 v.377 pp. 110-121
ISSN:
0021-9517
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; additives; air; aluminum oxide; amines; benzaldehyde; benzyl alcohol; carbon dioxide; catalysts; catalytic activity; gold; imines; models; nanogold; nanoparticles; oxidation; oxygen; recycling; synthesis; temperature; transmission electron microscopy; zinc
Abstract:
... Direct oxidative coupling of alcohols and amines is regarded as an effective and green approach for imine synthesis under mild conditions. In this work, Zn-doped γ-Al2O3 supported Au nanoparticles was demonstrated as highly active and selective heterogeneous catalyst for a series of imine productions with good to excellent yields, from alcohols and amines via direct oxidative coupling under air at ...
DOI:
10.1016/j.jcat.2019.07.027

68. Efficient utilization of photogenerated electrons and holes for photocatalytic redox reactions using visible light-driven Au/ZnIn2S4 hybrid

Author:
Taotao Zhu; Xiangju Ye; Qiaoqiao Zhang; Zhenzhen Hui; Xuchun Wang; Shifu Chen
Source:
Journal of hazardous materials 2019 v.367 pp. 277-285
ISSN:
0304-3894
Subject:
benzaldehyde; benzyl alcohol; carbon dioxide; electrons; gold; hydrogen; hydrogen production; irradiation; nanosheets; nitrogen fixation; oxidation; photocatalysis; photocatalysts; protons
Abstract:
... In this study, a new photocatalytic reaction system for simultaneous selective oxidation of aromatic alcohols to corresponding aldehydes and reduction of protons to H2 has been developed. The results reveal that compared with pure ZnIn2S4, the ZnIn2S4 photocatalysts modified with noble metal gold (Au/ZnIn2S4) significantly promote the photocatalytic performance. Among them, the 0.5% Au/ZnIn2S4 nan ...
DOI:
10.1016/j.jhazmat.2018.12.093

69. Electrocatalytic oxidation of water at a polyoxometalate nanoparticle modified gold electrode

Author:
Abhinandan Mahanta; Koushik Barman; Sk Jasimuddin
Source:
RSC advances 2019 v.9 no.66 pp. 38713-38717
ISSN:
2046-2069
Subject:
dielectric spectroscopy; electrodes; electrolysis; gold; oxidation; pH; phosphates; sodium dodecyl sulfate; transmission electron microscopy; ultraviolet-visible spectroscopy; voltammetry
Abstract:
... Spherical polyoxometalate nanoparticles, [HPMo]NPs, were synthesized from a very well known Keggin-type polyoxometalate [H₃PMo₁₂O₄₀] in the presence of sodium dodecyl sulphate (SDS) and polyvinyl pyrrolidine (PVP) in aqueous medium and characterized by UV-Vis spectroscopy and Transmission Electron Microscopy (TEM). The [HPMo]NPs were used to modify a gold working electrode and they were characteri ...
DOI:
10.1039/c9ra07450c

70. Electrocatalytic oxidation of water by the immobilized [Cuᴵᴵ(l-ala)(Phen)(H₂O)]⁺ complex on a self-assembled NCS⁻ modified gold electrode

Author:
Abhinandan Mahanta; Koushik Barman; Sk Jasimuddin
Source:
RSC advances 2019 v.9 no.41 pp. 23939-23943
ISSN:
2046-2069
Subject:
catalytic activity; copper; electrochemistry; electrodes; gold; oxidation; pH; phenylalanine
Abstract:
... Copper(ii) complex [Cuᴵᴵ(l-ala)(Phen)(H₂O)]⁺ (l-ala = l-phenylalanine, phen = phenanthroline) was immobilized over a self-assembled NCS⁻ modified gold electrode for the electrocatalytic oxidation of water. This surface anchored molecular complex can catalyze water oxidation reaction at a remarkably low overpotential of 327 mV with a current density of 0.5 mA cm⁻² at neutral pH. ...
DOI:
10.1039/c9ra02547b

71. Electrochemical Biosensor Based on Tetrahedral DNA Nanostructures and G-Quadruplex–Hemin Conformation for the Ultrasensitive Detection of MicroRNA-21 in Serum

Author:
Jian Lu; Jin Wang; Xialin Hu; Eric Gyimah; Salome Yakubu; Kun Wang; Xiangyang Wu; Zhen Zhang
Source:
Analytical chemistry 2019 v.91 no.11 pp. 7353-7359
ISSN:
1520-6882
Subject:
DNA; biomarkers; biosensors; blood serum; cysteine; detection limit; diagnostic techniques; electrodes; enzymes; gold; hydrogen peroxide; hydrolysis; microRNA; nanomaterials; nucleic acid hybridization; oxidation
Abstract:
... MicroRNAs (miRNAs) play important roles as significant biomarkers in disease diagnostics. Here, an electrochemical biosensor was developed for the quick, sensitive, and specific detection of miRNAs from human-serum samples using three-dimensional (3D) DNA tetrahedron-structured probes (TSPs) and duplex-specific nuclease (DSN). The designed TSPs were composed of a recognition sequence that correspo ...
DOI:
10.1021/acs.analchem.9b01133

72. Electrochemical Synthesis of Poly(3,4-ethylenedioxythiophene) Film Having Dot Structures for Diffraction Grating

Author:
Naoto Eguchi; Hiromasa Goto
Source:
ACS applied materials & interfaces 2019 v.11 no.33 pp. 30163-30175
ISSN:
1944-8252
Subject:
atomic force microscopy; cellulose; coatings; color; electrochemistry; electrolytes; electrosynthesis; gold; light; liquid crystals; nanomaterials; oxidation; polymerization; scanning electron microscopy; wavelengths
Abstract:
... Poly(3,4-ethylenedioxythiophene) (PEDOT) dot micro/nanostructures are synthesized by electrochemical polymerization in a concentrated hydroxypropyl cellulose (HPC) liquid crystal electrolyte solution. Surface observations by scanning electron microscopy and atomic force microscopy reveal micro/nanostructures having hemisphere-like dots on the surface of the PEDOT film, which causes light diffracti ...
DOI:
10.1021/acsami.9b04767

73. Electrochemical dual-aptamer-based biosensor for nonenzymatic detection of cardiac troponin I by nanohybrid electrocatalysts labeling combined with DNA nanotetrahedron structure

Author:
Duanping Sun; Zibin Luo; Jing Lu; Shangshi Zhang; Tong Che; Zuanguang Chen; Luyong Zhang
Source:
Biosensors & bioelectronics 2019 v.134 pp. 49-56
ISSN:
0956-5663
Subject:
aptasensors; benzoquinones; biomarkers; catalysts; complementary DNA; coordination polymers; detection limit; diagnostic techniques; early diagnosis; electrochemistry; electrodes; gold; hydrogen peroxide; hydroquinone; magnetism; myocardial infarction; nanogold; nanohybrids; nanoparticles; nucleic acid hybridization; oligonucleotides; oxidation; troponin I
Abstract:
... The accurate detection of biomarkers for acute myocardial infarction (AMI) plays an important role in clinical diagnosis and management process. In this work, we developed an electrochemical biosensor by using magnetic metal organic framework (MMOF) nanocatalysts and DNA nanotetrahedron (NTH) based dual-aptamer probes for nonenzymatic detection of cardiac troponin I (cTnI), a gold standard biomark ...
DOI:
10.1016/j.bios.2019.03.049

74. Enhanced colorimetric detection of norovirus using in-situ growth of Ag shell on Au NPs

Author:
Indra Memdi Khoris; Kenshin Takemura; Jaewook Lee; Toshimi Hara; Fuyuki Abe; Tetsuro Suzuki; Enoch Y. Park
Source:
Biosensors & bioelectronics 2019 v.126 pp. 425-432
ISSN:
0956-5663
Subject:
Norovirus; RNA; antibodies; bioassays; biosensors; catalytic activity; color; colorimetry; detection limit; enzyme activity; enzyme-linked immunosorbent assay; feces; gastroenteritis; gold; horseradish; hydrogen peroxide; hydroquinone; hygiene; ions; nanogold; nanosilver; oxidation; peroxidase; quinones; silver; wells
Abstract:
... Norovirus (NoV) is a leading cause of acute gastroenteritis. The low infectious dose and environmental stability of NoV facilitate its effective transmission through a variety of modes such as food, water and person-to-person. The available enzyme-linked immunosorbent assay (ELISA) for NoV detection has low sensitivity due to the low catalytic activity of the peroxidase used, and thus, a reliable ...
DOI:
10.1016/j.bios.2018.10.067

75. Enhancing Au/TiO₂ Catalyst Thermostability and Coking Resistance with Alkyl Phosphonic-Acid Self-Assembled Monolayers

Author:
Alexander H. Jenkins; Charles B. Musgrave; J. Will Medlin
Source:
ACS applied materials & interfaces 2019 v.11 no.44 pp. 41289-41296
ISSN:
1944-8252
Subject:
acetylene; active sites; carbon monoxide; catalysts; catalytic activity; gold; hydrogenation; nanogold; oxidation; phosphorous acid; temperature; thermal stability; titanium dioxide
Abstract:
... Metal oxide-supported Au catalysts, particularly those with small Au nanoparticles, catalyze a variety of reactions including low-temperature CO oxidation and selective hydrogenation of alkynes. However, the facile nature of Au particle growth at even moderate temperatures poses significant challenges to maintaining catalyst activity under reaction conditions. Here, we present a method to reduce t ...
DOI:
10.1021/acsami.9b13170

76. Evolution of steady-state material properties during catalysis: Oxidative coupling of methanol over nanoporous Ag0.03Au0.97

Author:
Branko Zugic; Matthijs A. van Spronsen; Christian Heine; Matthew M. Montemore; Yuanyuan Li; Dmitri N. Zakharov; Stavros Karakalos; Barbara A.J. Lechner; Ethan Crumlin; Monika M. Biener; Anatoly I. Frenkel; Juergen Biener; Eric A. Stach; Miquel B. Salmeron; Efthimios Kaxiras; Robert J. Madix; Cynthia M. Friend
Source:
Journal of catalysis 2019 v.380 pp. 366-374
ISSN:
0021-9517
Subject:
alloys; carbon dioxide; catalysts; catalytic activity; formates; gold; methanol; nanogold; nanopores; nanosilver; oxidation; oxygen; ozone; silver; temperature
Abstract:
... Activating pretreatments are used to tune surface composition and structure of bimetallic-alloy catalysts. Herein, the activation-induced changes in material properties of a nanoporous Ag₀.₀₃Au₀.₉₇ alloy and their subsequent evolution under steady-state CH₃OH oxidation conditions are investigated. Activation using O₃ results in AgO and Au₂O₃, strongly enriching the near-surface region in Ag. These ...
DOI:
10.1016/j.jcat.2019.08.041

77. Experimental and theoretical studies on kinetics for thermochemical sulfate reduction of oil, C2–5 and methane

Author:
Kun He; Shuichang Zhang; Jingkui Mi; Qisheng Ma; Yongchun Tang; Yu Fang
Source:
Journal of analytical and applied pyrolysis 2019 v.139 pp. 59-72
ISSN:
0165-2370
Subject:
activation energy; catalysts; density functional theory; energy; ethane; gases; gold; gypsum; hydrogen sulfide; liquids; magnesium sulfate; methane; oils; oxidation; pyrolysis; temperature
Abstract:
... To address the kinetic parameters for thermochemical sulfate reduction (TSR) of oil and hydrocarbon gases, hydrothermal experiments involving oil or methane and sulfate at 50 MPa were conducted by a gold tube pyrolysis system. By determination of gas yields in non-isothermal pyrolysis of oil with gypsum and water, it was found that the generation of H2S can be divided into two stages, including TS ...
DOI:
10.1016/j.jaap.2019.01.011

78. Extraordinary catalysis induced by titanium foil cathode plasma for degradation of water pollutant

Author:
Chaojiang Li; Yuhan Rao; Bowei Zhang; Kang Huang; Xun Cao; Dongdong Peng; Junsheng Wu; Longqiang Xiao; Yizhong Huang
Source:
Chemosphere 2019 v.214 pp. 341-348
ISSN:
0045-6535
Subject:
aqueous solutions; catalysts; cathodes; copper; cost effectiveness; dust; electrical conductivity; electrolytes; electron transfer; foil; gold; hydrogen; nanogold; oxidation; photocatalysis; pollutants; pollution; titanium; titanium dioxide; water purification
Abstract:
... The present paper reports a rapid and cost-effective bifunctional approach to the degradation of organic pollutants in the aqueous solution. This in situ hybrid induced photocatalytic method involves the advanced oxidation process, and photocatalytic process induced by ultraviolet radiated from the plasma discharge to improve the degradation efficiency. This powerful plasma allows the organic mole ...
DOI:
10.1016/j.chemosphere.2018.09.138

79. First-Principles Investigation of the Structure and Properties of Au Nanoparticles Supported on ZnO

Author:
Shih-Hsuan Hung; Keith McKenna
Source:
Journal of physical chemistry 2019 v.123 no.34 pp. 21185-21194
ISSN:
1932-7455
Subject:
adhesion; carbon monoxide; encapsulation; energy; gold; nanogold; oxidation; oxygen; physical chemistry; zinc; zinc oxide
Abstract:
... We present a first-principles investigation of the structure, stability, and reactivity of Au nanoparticles (NPs) supported on ZnO. The morphologies of supported Au NPs are predicted using the formation energy of Au surfaces and the adhesion energy between Au and the dominant ZnO surfaces exposed on ZnO tetrapods. We show how Zn interstitials (a stable intrinsic defect in ZnO) are attracted toward ...
DOI:
10.1021/acs.jpcc.9b02639
PubMed:
32064015
PubMed Central:
PMC7011761

80. Formation of PdO on Au–Pd bimetallic catalysts and the effect on benzyl alcohol oxidation

Author:
Pingping Wu; Yunxiang Cao; Lianming Zhao; Yue Wang; Zhengke He; Wei Xing; Peng Bai; Svetlana Mintova; Zifeng Yan
Source:
Journal of catalysis 2019 v.375 pp. 32-43
ISSN:
0021-9517
Subject:
alloys; benzyl alcohol; catalysts; catalytic activity; electron transfer; gold; nanoparticles; oxidation; palladium; porous media; silica; synergism
Abstract:
... A series of catalysts consisting of gold–palladium bimetallic nanoparticles (Au–Pd NPs in the range of 1–6 nm) anchored on foamlike mesoporous silica were used for the aerobic oxidation of benzyl alcohol. A remarkable synergistic effect was observed on these Au–Pd NP catalysts prepared by a one-pot method. Both experimental and theoretical study revealed a close relationship between the surface Pd ...
DOI:
10.1016/j.jcat.2019.05.003

81. Functionalization of Elongated Tetrahexahedral Au Nanoparticles and Their Antimicrobial Activity Assay

Author:
Satya Ranjan Sarker; Shakil Ahmed Polash; Jarryd Boath; Ahmad E. Kandjani; Arpita Poddar; Chaitali Dekiwadia; Ravi Shukla; Ylias Sabri; Suresh K. Bhargava
Source:
ACS applied materials & interfaces 2019 v.11 no.14 pp. 13450-13459
ISSN:
1944-8252
Subject:
2,2-diphenyl-1-picrylhydrazyl; Bacillus subtilis; Escherichia coli; antibacterial properties; antioxidant activity; bacteria; cell membranes; cell walls; cytotoxicity; disk diffusion antimicrobial test; electrostatic interactions; erythrocytes; fatty acids; gold; hemolysis; hydrophobic bonding; iron; lipid peroxidation; lipid peroxides; lipoic acid; nanogold; nanoparticles; neoplasm cells; oxidation; propidium; uterine cervical neoplasms
Abstract:
... Gold nanoparticles are inert for the human body, and therefore, they have been functionalized to provide them with antibacterial properties. Here, elongated tetrahexahedral (ETHH) Au nanoparticles were synthesized, characterized, and functionalized with lipoic acid (LA), a natural antioxidant with a terminal carboxylic acid and a dithiolane ring, to generate ETHH-LA Au nanoparticles. The antioxida ...
DOI:
10.1021/acsami.9b02279

82. General self-assembly of metal/metal chalcogenide heterostructures initiated by a surface linker: modulating tunable charge flow toward versatile photoredox catalysis

Author:
Tao Li; Ming-Hui Huang; Yu-Bing Li; Xiao-Cheng Dai; Yunhui He; Guangcan Xiao; Fang-Xing Xiao
Source:
Journal of materials chemistry A 2019 v.7 no.37 pp. 21182-21194
ISSN:
2050-7496
Subject:
alcohols; cadmium sulfide; electrons; energy conversion; engineering; gold; hydrogen production; irradiation; ligands; light; nanocrystals; nanogold; nitroaromatic compounds; oxidation; palladium; photocatalysis; photocatalysts; solar energy
Abstract:
... Interfacial charge separation and transfer enduringly constitutes a core issue, which dictates the efficiency of a photocatalytic reaction. However, the exquisite modulation of directional charge transfer to ideal reaction sites remains challenging in terms of the fast recombination rates of photoinduced charge carriers and the difficulty in constructing spatially separated high-speed charge trans ...
DOI:
10.1039/c9ta07569k

83. Generation of gold nanoclusters encapsulated in an MCM-22 zeolite for the aerobic oxidation of cyclohexane

Author:
Lichen Liu; Raul Arenal; Debora M. Meira; Avelino Corma
Source:
Chemical communications 2019 v.55 no.11 pp. 1607-1610
ISSN:
1364-548X
Subject:
chemical communication; cyclohexanones; gold; nanogold; oxidation; oxygen; zeolites
Abstract:
... In this work, we will report the generation of Au clusters in a purely siliceous MCM-22 zeolite. The catalytic properties of these Au clusters have been tested for the selective oxidation of cyclohexane to cyclohexanol and cyclohexanone (KA-oil). The Au clusters encapsulated in the MCM-22 zeolite are highly active and selective for the oxidation of cyclohexane to KA-oil, which is superior to Au na ...
DOI:
10.1039/c8cc07185c
PubMed:
30657161
PubMed Central:
PMC6369674

84. Gold Nanocrystal Etching as a Means of Probing the Dynamic Chemical Environment in Graphene Liquid Cell Electron Microscopy

Author:
Matthew R. Hauwiller; Justin C. Ondry; Cindy M. Chan; Prachi Khandekar; Jessica Yu; A. Paul Alivisatos
Source:
Journal of the American Chemical Society 2019 v.141 no.10 pp. 4428-4437
ISSN:
1520-5126
Subject:
bubbles; electron microscopy; ferric chloride; gold; graphene; hydrogen; image analysis; liquids; nanocrystals; nanogold; oxidation; radiolysis; reducing agents
Abstract:
... Graphene liquid cell electron microscopy has the necessary temporal and spatial resolution to enable the in situ observation of nanoscale dynamics in solution. However, the chemistry of the solution in the liquid cell during imaging is as yet poorly understood due to the generation of a complex mixture of radiolysis products by the electron beam. In this work, the etching trajectories of nanocryst ...
DOI:
10.1021/jacs.9b00082

85. Gold(I)-Catalyzed Oxidation of Acyl Acetylenes to Vicinal Tricarbonyls

Author:
Alexey Yu. Dubovtsev; Dmitry V. Dar’in; Vadim Yu. Kukushkin
Source:
Organic letters 2019 v.21 no.11 pp. 4116-4119
ISSN:
1523-7052
Subject:
alkynes; catalytic activity; chemical structure; gold; oxidation; synthesis
Abstract:
... Efficient gold(I)-catalyzed oxidation of COR²-functionalized internal alkynes to vicinal tricarbonyl compounds by 2,6-dichloropyridine N-oxide proceeds under mild conditions (DCM, rt). This catalytic reaction provides a good to excellent yielding route to diverse tricarbonyls such as α,β-diketoesters, 1,2,3-triketones, and α,β-diketoamides. The utility of these compounds was also demonstrated by f ...
DOI:
10.1021/acs.orglett.9b01297

86. Gold-Catalyzed Oxidation of Thioalkynes To Form Phenylthio Ketene Derivatives via a Noncarbene Route

Author:
Pankaj Sharma; Rahulkumar Rajmani Singh; Sovan Sundar Giri; Liang-Yu Chen; Mu-Jeng Cheng; Rai-Shung Liu
Source:
Organic letters 2019 v.21 no.14 pp. 5475-5479
ISSN:
1523-7052
Subject:
alcohols; carbenes; catalytic activity; chemical structure; density functional theory; esters; gold; ketones; oxidation; oxides
Abstract:
... Gold-catalyzed oxidations of thioalkynes with 8-methylquinoline oxides afford 2-phenylthioketenes that can be trapped efficiently with alcohols. The synthetic utility is manifested by terminal and internal thioalkynes over a wide scope, bearing esters, ketones, alkyl, and oxime substituents. Our density functional theory calculations suggest that gold-catalyzed oxidations of terminal and internal ...
DOI:
10.1021/acs.orglett.9b01768

87. Graphene on the oxidized SiC surface and the impact of the metal intercalation

Author:
J.E. Padilha; R.B. Pontes; F. Crasto de Lima; R. Kagimura; R.H. Miwa
Source:
Carbon 2019 v.145 pp. 603-613
ISSN:
0008-6223
Subject:
X-ray absorption spectroscopy; aluminum; electric field; electrons; engineering; gold; graphene; oxidation; silicates; silicon carbide
Abstract:
... We have performed first-principles calculations of the structural and the electronic properties of graphene (G) adsorbed (i) on the oxidized SiC surface (G/X/SiC, with X = Si2O3, Si2O5, and OH), and (ii) on the metal (M = Au and Al) intercalated Si2O5 silicate layer, G/(M)Si2O5/SiC. In (i), we focused on the structural characterization of the oxidized surface, based on a set of simulations of the ...
DOI:
10.1016/j.carbon.2019.01.033

88. Green Fabrication of Integrated Au/CuO/Oyster Shell Nanocatalysts with Oyster Shells as Alternative Supports for CO Oxidation

Author:
Xiao Liu; Jiajun Dai; Wen Li; Kuncan Wang; Jiale Huang; Qingbiao Li; Guowu Zhan
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.21 pp. 17768-17777
ISSN:
2168-0485
Subject:
3-mercaptopropionic acid; adsorption; calcium carbonate; carbon monoxide; catalysts; catalytic activity; copper; cupric oxide; density functional theory; gold; hydrophilicity; nanomaterials; oxidation; oyster shells; synergism; wastes
Abstract:
... Oyster shells (OSs) are a kind of reusable resources which are largely discarded randomly as waste. In this study, we have employed OSs as rigid supports to fabricate integrated Au/CuO/OS nanocatalysts by chemical functionalization of the hydrophilic OS surface with 3-mercaptopropionic acid. The exposed mercapto groups on the OS surface facilitate the complexation of copper ions during the in situ ...
DOI:
10.1021/acssuschemeng.9b04181

89. Green Photocatalytic Oxidation of Benzyl Alcohol over Noble-Metal-Modified H₂Ti₃O₇ Nanowires

Author:
Mingming Du; Ganning Zeng; Jiale Huang; Daohua Sun; Qingbiao Li; Guoliang Wang; Xiaonian Li
Source:
ACS sustainable chemistry & engineering 2019 v.7 no.10 pp. 9717-9726
ISSN:
2168-0485
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; benzyl alcohol; catalysts; gold; irradiation; nanogold; nanoparticles; nanosilver; nanowires; nitrogen; oxidation; palladium; photocatalysis; reflectance; silver; synergism; transmission electron microscopy
Abstract:
... One-dimensional H₂Ti₃O₇ nanowires (NWs) supported by Au, Ag, and Pd monometallic nanoparticles (NPs) and Au–Pd bimetallic NPs were prepared and used for photochemical benzyl alcohol oxidation. Techniques, such as XRD, TEM, XPS, N₂ physisorption, and diffuse reflectance ultraviolet–visible (DRUV–vis), were used to characterize the obtained catalysts. These results showed that the Pd/H₂Ti₃O₇ NWs cat ...
DOI:
10.1021/acssuschemeng.9b01817

90. Green synthesis of Au decorated CoFe₂O₄ nanoparticles for catalytic reduction of 4-nitrophenol and dimethylphenylsilane oxidation

Author:
Samuel Saire-Saire; Eduardo C. M. Barbosa; Daniel Garcia; Leandro H. Andrade; Sergi Garcia-Segura; Pedro H. C. Camargo; Hugo Alarcon
Source:
RSC advances 2019 v.9 no.38 pp. 22116-22123
ISSN:
2046-2069
Subject:
catalytic activity; ferrimagnetic materials; gold; lighting; magnetism; nanogold; nanoparticles; oxidation; p-nitrophenol; solar radiation
Abstract:
... Gold nanoparticles (Au NPs) have been widely employed in catalysis. Here, we report on the synthesis and catalytic evaluation of a hybrid material composed of Au NPs deposited at the surface of magnetic cobalt ferrite (CoFe₂O₄). Our reported approach enabled the synthesis of well-defined Au/CoFe₂O₄ NPs. The Au NPs were uniformly deposited at the surface of the support, displayed spherical shape, a ...
DOI:
10.1039/c9ra04222a

91. Halide-Dependent Dealloying of Cuₓ/Auy Core/Shell Nanoparticles for Composition Analysis by Anodic Stripping Voltammetry

Author:
Dhruba K. Pattadar; Francis P. Zamborini
Source:
Journal of physical chemistry 2019 v.123 no.14 pp. 9496-9505
ISSN:
1932-7455
Subject:
adsorption; alloys; chemical bonding; copper; electrodes; electrolytes; gold; nanoparticles; oxidation; potassium bromide; potassium chloride
Abstract:
... Here, we describe the composition analysis of 5–7 nm diameter citrate-stabilized Cu/Au core/shell nanoparticles with composition ratios of Cu₁/Auₓ (x = 0.001–2) attached to amine-functionalized glass/indium-tin-oxide electrodes using anodic stripping voltammetry (ASV) in acidic KBr or KCl electrolyte solutions. One peak typically appears for Au oxidation, which is at more positive potential than t ...
DOI:
10.1021/acs.jpcc.8b12174

92. Hierarchical Cu@CuxO nanowires arrays-coated gold nanodots as a highly sensitive self-supported electrocatalyst for L-cysteine oxidation

Author:
Huu Tuan Le; Duy Thanh Tran; Thi Luu Luyen Doan; Nam Hoon Kim; Joong Hee Lee
Source:
Biosensors & bioelectronics 2019 v.139 pp. 111327
ISSN:
0956-5663
Subject:
biosensors; catalysts; chemical structure; copper; copper nanoparticles; cost effectiveness; cysteine; detection limit; disease diagnosis; electrochemistry; gold; health services; nanogold; nanowires; oxidation; surface area; synergism
Abstract:
... The sensitivity, selectivity, and stability of an electrochemical sensor for detecting small biomolecules can be significantly upgraded through properly controlling the morphology and chemical structure of electrocatalyst. Herein, we fabricated a unique hierarchical nanostructure based on Cu@CuxO nanowires (NWs) array uniformly depositing with a layer of gold nanoparticles (2–3 nm) through a simpl ...
DOI:
10.1016/j.bios.2019.111327

93. High performance photoanodic catalyst prepared from an active organic photovoltaic cell – high potential gain from visible light

Author:
Keiji Nagai; Takayuki Kuwabara; Mohd Fairus Ahmad; Masahiro Nakano; Makoto Karakawa; Tetsuya Taima; Kohshin Takahashi
Source:
Chemical communications 2019 v.55 no.83 pp. 12491-12494
ISSN:
1364-548X
Subject:
catalysts; catalytic activity; coatings; electrochemistry; electrodes; gold; light; microscopy; oxidation; photochemistry; photovoltaic cells; silver; silver chloride; thiols; zinc oxide
Abstract:
... Photoelectrochemical oxidation of thiols was enhanced with a threshold potential of −0.35 V vs. Ag/AgCl by the use of a ZnPc/PCBM:P3HT/ZnO electode, which was prepared by removing the PEDOT:PSS/Au electrode of an inverted OPV device and coating it with ZnPc. A co-photocatalysis property of ZnPc was observed in the photoelectrochemistry and scanning Kelvin probe microscopy. ...
DOI:
10.1039/c9cc04759j

94. High-Density Pd Nanorod Arrays on Au Nanocrystals for High-Performance Ethanol Electrooxidation

Author:
Caihong Fang; Ting Bi; Qian Ding; Zhiqing Cui; Nan Yu; Xiaoxiao Xu; Baoyou Geng
Source:
ACS applied materials & interfaces 2019 v.11 no.22 pp. 20117-20124
ISSN:
1944-8252
Subject:
anisotropy; energy; ethanol; gold; nanocrystals; nanogold; nanorods; oxidation; palladium
Abstract:
... In the synthesis of Au/Pd bimetallic nanocrystals, a layer-by-layer growth is favored, owing to the low bonding energy between Pd atoms (EPd–Pd) in comparison with EAᵤ–Pd, resulting in homogeneous core/shell nanostructures. Herein, we demonstrate designed synthetic tactics to unconventional Au/Pd heterostructures through a deposition-dominant growth pathway of the newly reduced Pd atoms, which bre ...
DOI:
10.1021/acsami.9b06182

95. Highly Efficient Dual-Polar Electrochemiluminescence from Au₂₅ Nanoclusters: The Next Generation of Multibiomarker Detection in a Single Step

Author:
Ying Zhou; Yaqin Chai; Ruo Yuan
Source:
Analytical chemistry 2019 v.91 no.22 pp. 14618-14623
ISSN:
1520-6882
Subject:
antigens; biomarkers; bovine serum albumin; copper nanoparticles; cuprous oxide; dissolved oxygen; electrochemiluminescence; emissions; gold; mucins; nanogold; nanosheets; oxidation; titanium dioxide
Abstract:
... For the first time, simultaneous cathodic and anodic electrochemiluminescence (ECL) emissions of bull serum albumin stabilized Au₂₅ nanoclusters (Au₂₅ NCs) as highly efficient bipolar ECL probes were constructed for the single-step and synchronous determination of carcinoembryonic antigen (CEA) and mucin 1 (MUC1) based on different coreactant and coreaction accelerators. Under the potential cathod ...
DOI:
10.1021/acs.analchem.9b03736

96. Highly Efficient Photoelectrochemical Reduction of CO₂ at Low Applied Voltage Using 3D Co-Pi/BiVO₄/SnO₂ Nanosheet Array Photoanodes

Author:
Li-Xia Liu; Jiaju Fu; Li-Ping Jiang; Jian-Rong Zhang; Wenlei Zhu; Yuehe Lin
Source:
ACS applied materials & interfaces 2019 v.11 no.29 pp. 26024-26031
ISSN:
1944-8252
Subject:
bismuth; carbon dioxide; cathodes; electric current; electric potential difference; electric power; electrochemistry; electron transfer; gases; gold; nanogold; nanosheets; oxidation; oxygen production; photochemistry; pollution; prices; tin dioxide
Abstract:
... To solve the increasing level of carbon dioxide (CO₂) in the atmosphere, the bismuth vanadate (BiVO₄)-based photoanode for photoelectrochemical (PEC) water oxidation has been considered as a promising candidate of power supply for CO₂ reduction because of its low price and relatively narrow band gap. Nevertheless, the PEC capability of BiVO₄ photoelectrodes is restricted by the short carrier diffu ...
DOI:
10.1021/acsami.9b08144

97. Highly Electrocatalytic, Durable, and Stretchable Nanohybrid Fiber for On-Body Sweat Glucose Detection

Author:
Phan Tan Toi; Tran Quang Trung; Thi My Linh Dang; Chan Wool Bae; Nae-Eung Lee
Source:
ACS applied materials & interfaces 2019 v.11 no.11 pp. 10707-10717
ISSN:
1944-8252
Subject:
biosensors; blood glucose; dehydrogenation; fabrics; glucose; gold; graphene oxide; humans; moieties; nanogold; nanohybrids; oxidation; sweat
Abstract:
... A conformal patch biosensor that can detect biomolecules is one promising technology for wearable sweat glucose self-monitoring. However, developing such a patch is challenging because conferring stretchability to its components is difficult. Herein, we demonstrate a platform for a nonenzymatic, electrochemical sensor patch: a wrinkled, stretchable, nanohybrid fiber (WSNF) in which Au nanowrinkles ...
DOI:
10.1021/acsami.8b20583

98. Highly Uniform, Flexible Microelectrodes Based on the Clean Single-Walled Carbon Nanotube Thin Film with High Electrochemical Activity

Author:
Nguyen Xuan Viet; Shigeru Kishimoto; Yutaka Ohno
Source:
ACS applied materials & interfaces 2019 v.11 no.6 pp. 6389-6395
ISSN:
1944-8252
Subject:
biocompatibility; carbon fibers; carbon nanotubes; detection limit; dopamine; electrochemistry; fouling; gold; microelectrodes; oxidation; plastic film; sensors (equipment); vapors
Abstract:
... Electrochemical sensors based on carbon nanotubes (CNTs) have great potential for use in wearable or implantable biomedical sensor applications because of their excellent mechanical flexibility and biocompatibility. However, the main challenge associated with CNT-based sensors is their uniform and reproducible fabrication on the flexible plastic film. Here, we introduce and demonstrate a highly re ...
DOI:
10.1021/acsami.8b19252

99. Highly sensitive nitrite sensor based on AuNPs/RGO nanocomposites modified graphene electrochemical transistors

Author:
Yang Zhou; Mingyu Ma; Hanping He; Zhiwei Cai; Nan Gao; Chaohui He; Gang Chang; Xianbao Wang; Yunbin He
Source:
Biosensors & bioelectronics 2019 v.146 pp. 111751
ISSN:
0956-5663
Subject:
biosensors; catalytic activity; chromatography; detection limit; electric potential difference; electrochemistry; electrodes; fluorescence emission spectroscopy; gold; graphene; graphene oxide; human health; ions; lakes; nanocomposites; nanogold; nitrites; oxidation; transistors
Abstract:
... Detection of nitrite is important for environmental safety and human health, and the development of high-performance sensors for accurate detection of nitrite is highly desirable. Herein, a highly sensitive graphene electrochemical transistor (GECT) nitrite sensor was designed and fabricated for the first time. A single layer of graphene was placed between the source and drain electrodes by the we ...
DOI:
10.1016/j.bios.2019.111751

100. Hot electrons generated by intraband and interband transition detected using a plasmonic Cu/TiO₂ nanodiode

Author:
Changhwan Lee; Yujin Park; Jeong Young Park
Source:
RSC advances 2019 v.9 no.32 pp. 18371-18376
ISSN:
2046-2069
Subject:
aluminum; aluminum oxide; copper; electric current; electromagnetic field; electrons; energy conversion; gold; nanogold; oxidation; photovoltaic cells; silver; surface plasmon resonance; titanium dioxide
Abstract:
... The use of metal nanoparticles, including Au, Ag, Cu, and Al, can increase the efficiency of photovoltaic devices by electromagnetic field enhancement, which is driven by the excitation of localized surface plasmon resonance. Direct energy conversion from light into electricity via the decay of surface plasmons causing the excitation of hot electron–hole pairs is also a feasible channel. The gener ...
DOI:
10.1039/c9ra02601k