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1. Effects of Pb doping on the electrical transport performance of Cu1.98Se

Author:
Li, Hanyang; Du, Xueli; Cao, Lei; Guo, Xiaohui; Yuan, Zhihao
Source:
Journal of materials science 2020 v.55 no.7 pp. 2905-2912
ISSN:
0022-2461
Subject:
copper,   etc   ; ions; lead; selenides;     Show all 4 Subjects
Abstract:
... Cu₂₋δSe is an eco-friendly thermoelectric candidate owing to Cu ions migration in its high-temperature beta phase, and meanwhile the liquid-like Cu ions deteriorate the stability and reliability of materials. Here, Pb²⁺ ion was introduced into the Cu₁.₉₈Se lattice to improve the thermoelectric properties and the stability. The Pb-doped Cu₁.₉₈₋ₓPbₓSe (x = 0–0.035) compounds prepared by a facile sol ...
DOI:
10.1007/s10853-019-04242-9

2. Suppressing the dynamic precipitation and lowering the thermal conductivity for stable and high thermoelectric performance in BaCu₂Te₂ based materials

Author:
Guo, Kai; Lin, Jianwei; Li, Yang; Zhu, Yifan; Li, Xin; Yang, Xinxin; Xing, Juanjuan; Yang, Jiong; Luo, Jun; Zhao, Jing-Tai
Source:
Journal of materials chemistry A 2020 v.8 no.10 pp. 5323-5331
ISSN:
2050-7496
Subject:
copper; copper nanoparticles,   etc   ; ambient temperature; semiconductors; thermal conductivity;     Show all 5 Subjects
Abstract:
... Dynamic precipitation phenomena are usually observed in Cu- and Ag-based thermoelectric compounds undergoing a temperature rise, affecting the stability and thermoelectric figure of merit zT. The present work demonstrates that rational controlling of the Cu content would eliminate unstable factors in BaCu₂Te₂, beneficial for achieving stable and reliable thermoelectric materials. Over-stoichiometr ...
DOI:
10.1039/d0ta00245c

3. Optoelectronic Impacts of Particle Size in Water-Dispersible Plasmonic Copper Selenide Nanoparticles

Author:
Gan, Xing Yee; Crawford, Scott E.; Eikey, Emily A.; Sen, Riti; Killinger, Jack R.; Millstone, Jill E.
Source:
Journal of physical chemistry 2020 v.124 no.8 pp. 4747-4754
ISSN:
1932-7455
Subject:
copper; copper nanoparticles,   etc   ; absorbance; particle size; physical chemistry; selenides;     Show all 6 Subjects
Abstract:
... There is significant interest in earth-abundant plasmonic materials, but whether or not their performance can match or even surpass their noble metal counterparts remains to be established. An important step in determining the extent of their versatility is to understand basic aspects of their plasmonic features. In this work, we measure near-infrared plasmonic molar extinction coefficients of wat ...
DOI:
10.1021/acs.jpcc.9b11547

4. A flexible non-enzymatic glucose sensor based on copper nanoparticles anchored on laser-induced graphene

Author:
Zhang, Yue; Li, Na; Xiang, Yangjun; Wang, Debo; Zhang, Peng; Wang, Yanyan; Lu, Shan; Xu, Rongqing; Zhao, Jiang
Source:
Carbon 2020 v.156 pp. 506-513
ISSN:
0008-6223
Subject:
copper; copper nanoparticles,   etc   ; biosensors; detection limit; diagnostic techniques; glucose; graphene;     Show all 7 Subjects
Abstract:
... An original flexible enzyme-free glucose amperometric biosensor based on Cu nanoparticles anchored on laser-induced graphene (Cu NPs-LIG) composite is successfully developed by a simple substrate-assisted electroless deposition (SAED) technique. The as-prepared Cu NPs-LIG sensor demonstrates an excellent glucose sensitivity of 495 μA mM⁻¹ cm⁻², ultrafast response time less than 0.5 s and the promi ...
DOI:
10.1016/j.carbon.2019.10.006

5. Semiquantitative naked-eye detection of Cu(ii) with a standard colorimetric card via a hydrogel-coated paper sensor

Author:
Fan, Kaiqi; Wang, Xiaobo; Yang, Haoran; Gao, Lijun; Han, Guanglu; Zhou, Liming; Fang, Shaoming
Source:
Analytical methods 2020 v.12 no.12 pp. 1561-1566
ISSN:
1759-9679
Subject:
copper,   etc   ; heavy metals; ions; pH;     Show all 4 Subjects
Abstract:
... A new type of hydrogel-coated paper sensor was developed for the semiquantitative and naked-eye detection of Cu²⁺ ions with high selectivity and good regenerability. The paper sensor showed a continuous color change from colorless to blue, resulting in semiquantitative naked-eye detection. Furthermore, similar to the classical pH test paper, a standard colorimetric card was used in the visual dete ...
DOI:
10.1039/d0ay00038h

6. Approximate rotation vector expressions to consider crystal orientation changes in plastically deformed materials

Author:
Onaka, Susumu
Source:
Journal of materials science 2020 v.55 no.5 pp. 2186-2192
ISSN:
0022-2461
Subject:
copper,   etc   ; crystals; microstructure; plastic deformation;     Show all 4 Subjects
Abstract:
... Orientation changes are important factors when considering microstructural changes in materials caused by plastic deformation because these are related to the arrangement and density of dislocations. The three elements of a logarithm of a rotation matrix are called log angles, which compose a rotation vector that can be used as a parameter to represent crystal orientations. Herein, approximate exp ...
DOI:
10.1007/s10853-019-04030-5

7. A strategy to control the grain boundary density and Cu⁺/Cu⁰ ratio of Cu-based catalysts for efficient electroreduction of CO₂ to C2 products

Author:
Chen, Chunjun; Sun, Xiaofu; Yan, Xupeng; Wu, Yahui; Liu, Mingyang; Liu, Shuaishuai; Zhao, Zhijuan; Han, Buxing
Source:
Green chemistry 2020 v.22 no.5 pp. 1572-1576
ISSN:
1463-9270
Subject:
copper; copper hydroxide; copper nanoparticles,   etc   ; active sites; carbon dioxide; catalysts; cupric oxide; cuprous oxide; green chemistry;     Show all 9 Subjects
Abstract:
... Cu(OH)₂/CuO nanocomposite-derived Cu₂O/Cu was highly efficient for CO₂ electroreduction to C2 products. The highest faradaic efficiency and current density could reach 64.5% and 26.2 mA cm⁻², respectively. By changing the calcination time, moderate grain boundary density and the Cu⁺/Cu⁰ ratio in catalysts can be controlled, leading to a large number of active sites and low interfacial charge trans ...
DOI:
10.1039/d0gc00247j

8. Distribution and availability of fungicide-derived copper in soil aggregates

Author:
Wang, Quan-Ying; Sun, Jing-Yue; Xu, Xing-Jian; Yu, Hong-Wen
Source:
Journal of soils and sediments 2020 v.20 no.2 pp. 816-823
ISSN:
1439-0108
Subject:
copper; copper oxychloride; copper sulfate,   etc   ; Mollisols; bioavailability; calcium hydroxide; cupric nitrate; fungicides; sieving; soil aggregates; soil separates;     Show all 11 Subjects
Abstract:
... PURPOSE: Soil consists of various sizes of aggregates, and different soil aggregates vary in their abilities to adsorb or transport metals. This study aimed to investigate the distribution behaviors of Cu from different fungicides in soil aggregates after a 15-month incubation. MATERIALS AND METHODS: Bordeaux mixture (CuSO₄/Ca(OH)₂ = 1/1 by weight, BR), copper nitrate (Cu(NO₃)₂·4H₂O, CN), and copp ...
DOI:
10.1007/s11368-019-02441-0

9. A stable and high-energy hybrid supercapacitor using porous Cu₂O–Cu₁.₈S nanowire arrays

Author:
Esfandiar, Ali; Qorbani, Mohammad; Shown, Indrajit; Ojaghi Dogahe, Badrosadat
Source:
Journal of materials chemistry A 2020 v.8 no.4 pp. 1920-1928
ISSN:
2050-7496
Subject:
copper; copper hydroxide; copper nanoparticles,   etc   ; active sites; capacitance; cost effectiveness; electrochemical capacitors; electrochemistry; electrodes; energy; foams; ions; nanowires; polymers;     Show all 14 Subjects
Abstract:
... A three-dimensional electrode based on porous Cu₂O–Cu₁.₈S nanowires is prepared by means of a facile fabrication process. In this electrode, nanowires are decorated with Cu₁.₈S polyhedral nanostructures on the top, which are directly grown on a copper foam, thereby eliminating the need for a polymer binder. As an electrochemical electrode, it exhibits an extrinsic pseudocapacitive charge storage m ...
DOI:
10.1039/c9ta12675a

10. Metal nanoparticle-embedded bacterial cellulose aerogels via swelling-induced adsorption for nitrophenol reduction

Author:
Song, Lian; Shu, Lian; Wang, Yaquan; Zhang, Xiong-Fei; Wang, Zhongguo; Feng, Yi; Yao, Jianfeng
Source:
International journal of biological macromolecules 2020 v.143 pp. 922-927
ISSN:
0141-8130
Subject:
copper; copper nanoparticles; copper sulfate,   etc   ; adsorption; aerogels; catalysts; catalytic activity; cellulose; nickel; p-nitrophenol; scanning electron microscopy;     Show all 11 Subjects
Abstract:
... Bacterial cellulose aerogels were chosen as the substrate for supporting and dispersing metal nanoparticles (Cu and Ni). During the catalyst preparation, we found that the swelling-induced adsorption process could control the metal size and dispersion simultaneously. Cu and Ni nanoparticles were confined into the bacterial cellulose network and SEM results demonstrated that Cu particles had a smal ...
DOI:
10.1016/j.ijbiomac.2019.09.152

11. Influence of water chemistry on colloid-size Cu-based pesticides particles: A case of Cu(OH)2 commercial fungicide/bactericide

Author:
Tegenaw, Ayenachew; Sorial, George A.; Sahle-Demessie, Endalkachew; Han, Changseok
Source:
Chemosphere 2020 v.239 pp. 124699
ISSN:
0045-6535
Subject:
copper; copper hydroxide; copper nanoparticles,   etc   ; calcium; dispersions; environmental exposure; fungicides; hydrochemistry; ionic strength; pH; particle size; toxicity; zeta potential;     Show all 13 Subjects
Abstract:
... The intensive, widespread, and ever-increasing applications of Cu-based pesticides in agriculture could potentially increase environmental exposures via different routes. Unlike ionic/bulk forms, the fate, transport, and toxicity of colloid-size Cu-based pesticides are not well studied. This paper provides evaluation outcomes of granule and dispersion characterizations, stability, and dissolution ...
DOI:
10.1016/j.chemosphere.2019.124699

12. Quantification of synergistic, additive and antagonistic effects of aerosol components on total oxidative potential

Author:
Guo, Huibin; Fu, Haiyan; Jin, Lei; Huang, Sijing; Li, Xiang
Source:
Chemosphere 2020 v.252 pp. 126573
ISSN:
0045-6535
Subject:
copper,   etc   ; aerosols; iron; manganese; prediction; quinones;     Show all 6 Subjects
Abstract:
... The interaction-based oxidative potential (OPᵢₙₜ) represents the prediction of binary mixture effects distinguishing from linear additivity by including information on binary mixtures among PM components. The objective of this work is to develope a reliable estimate on the possible synergistic or antagonistic possibility of binary PM components and to quantify the combined effect. We firstly asses ...
DOI:
10.1016/j.chemosphere.2020.126573

13. Dual use of colorimetric sensor and selective copper removal from aqueous media with novel p(HEMA-co-TACYC) hydrogels: Cyclen derivative as both monomer and crosslinker

Author:
Ozay, Hava; Gungor, Zeynep; Yilmaz, Betul; Ilgin, Pinar; Ozay, Ozgur
Source:
Journal of hazardous materials 2020 v.389 pp. 121848
ISSN:
0304-3894
Subject:
copper,   etc   ; adsorbents; adsorption; colorimetry; hydrogels; rivers; seawater;     Show all 7 Subjects
Abstract:
... Within the scope of this study, p(2-hydroxyethyl methacrylate-co-tetraacrylic cyclen) (p(HEMA-co-TACYC)) hydrogels were synthesized for the first time in the literature using a tetraacrylic cyclen (TACYC) as both functional monomer and crosslinker. The hydrogels designed especially for Cu²⁺ ions showed colorimetric sensor behavior selective for Cu²⁺ ions in all aqueous media (deionized, tap, river ...
DOI:
10.1016/j.jhazmat.2019.121848

14. Hydrogen sorption capacity of crystal lattice defects and low Miller index surfaces of copper

Author:
Lousada, Cláudio M.; Korzhavyi, Pavel A.
Source:
Journal of materials science 2020 v.55 no.15 pp. 6623-6636
ISSN:
0022-2461
Subject:
copper,   etc   ; chemical bonding; hydrogen; physicochemical properties; sorption;     Show all 5 Subjects
Abstract:
... The effect of hydrogen on the physical–chemical properties of copper is directly dependent on the types of chemical bonding between H and lattice defects in Cu. In this work, we performed a systematic study of the bonding of H-atoms with crystal lattice defects of copper. This included three types of symmetric tilt grain boundaries (GBs), Σ3, Σ5 and Σ11, and the low Miller index surfaces, (111), ( ...
DOI:
10.1007/s10853-020-04459-z

15. Suzuki cross coupling followed by cross dehydrogenative coupling: An efficient one pot synthesis of Phenanthrenequinones and analogues

Author:
Sarkar, Pompy; Ahmed, Atiur; Ray, Jayanta K.
Source:
Tetrahedron letters 2020 v.61 no.13 pp. 151701
ISSN:
0040-4039
Subject:
copper,   etc   ; catalytic activity; chemical structure; dehydrogenation; quinones;     Show all 5 Subjects
Abstract:
... An efficient one pot protocol has been developed towards the synthesis of substituted phenanthrenequinone and analogous derivatives via Suzuki cross coupling followed by copper catalyzed cross dehydrogenative coupling. ...
DOI:
10.1016/j.tetlet.2020.151701

16. Order–Disorder Transition in Kesterite Cu₂ZnSnS₄: Thermopower Enhancement via Electronic Band Structure Modification

Author:
Isotta, Eleonora; Mukherjee, Binayak; Fanciulli, Carlo; Pugno, Nicola M.; Scardi, Paolo
Source:
Journal of physical chemistry 2020 v.124 no.13 pp. 7091-7096
ISSN:
1932-7455
Subject:
copper zinc tin sulfide,   etc   ; crystal structure; temperature;     Show all 3 Subjects
Abstract:
... The order–disorder transition of kesterite (CZTS, Cu₂ZnSnS₄) from I4̅ to I4̅2m crystal structures has a marked effect on Seebeck coefficient, which displays a sharp enhancement at the transition temperature, around 533 K. Considered to be detrimental for the performance of photovoltaic kesterite, the order–disorder transition appears to be beneficial for thermopower. Experimental data and ab initi ...
DOI:
10.1021/acs.jpcc.0c00886

17. Vibronic Fingerprints of the Nickel Oxidation States in Surface-Supported Porphyrin Arrays

Author:
Stredansky, M.; Moro, S.; Corva, M.; Jugovac, M.; Zamborlini, G.; Feyer, V.; Schneider, C. M.; Cojocariu, I.; Sturmeit, H. M.; Cinchetti, M.; Verdini, A.; Cossaro, A.; Floreano, L.; Vesselli, E.
Source:
Journal of physical chemistry 2020 v.124 no.11 pp. 6297-6303
ISSN:
1932-7455
Subject:
copper,   etc   ; methanogens; nickel; oxidation; oxidoreductases; porphyrins; solvents;     Show all 7 Subjects
Abstract:
... The 2D self-assembly of Ni-containing tetrapyrroles on Cu(100) allows control of the Ni atom oxidation state, yielding inactive Ni(II) or active Ni(I) upon modification of the molecule–substrate interaction, resembling the behavior of the biochemical counterpart. Ni(I) is indeed the active site of methanogenic bacteria in the tetrahydrocorphin of the F₄₃₀ coenzyme of methyl-coenzyme reductase. Tun ...
DOI:
10.1021/acs.jpcc.0c01387

18. Sustainable Electrosynthesis of Porous CuN₃ Films for Functional Energetic Chips

Author:
Yu, Chunpei; Zheng, Zilong; Zhang, Wenchao; Hu, Bin; Chen, Yajie; Chen, Junhong; Ma, Kefeng; Ye, Jiahai; Zhu, Junwu
Source:
ACS sustainable chemistry & engineering 2020 v.8 no.9 pp. 3969-3975
ISSN:
2168-0485
Subject:
copper,   etc   ; density functional theory; electrosynthesis; energy;     Show all 4 Subjects
Abstract:
... A porous CuN₃ film has been facilely synthesized by a sustainable electroassisted azidation methodology using the template of porous Cu as a precursor. Such porous CuN₃ films show excellent performances of both superior energy release and tremendous brisance, which can be tuned by changes of the current density and azidation time. Energy release reaches a maximum of 1200 J·g–¹ at a current density ...
DOI:
10.1021/acssuschemeng.0c00295

19. Metallic copper removal optimization from real wastewater using pulsed electrodeposition

Author:
de Morais Nepel, Thayane Carpanedo; Carpanedo de Morais Nepel, Thayane; Landers, Richard; Gurgel Adeodato Vieira, Melissa; Florêncio de Almeida Neto, Ambrósio
Source:
Journal of hazardous materials 2020 v.384 pp. 121416
ISSN:
0304-3894
Subject:
copper,   etc   ; coatings; oxides; temperature; waste utilization; wastewater;     Show all 6 Subjects
Abstract:
... The recovery of metals from wastewater is a recurrent problem due to numerous productive activities that produce wastewaters rich in toxic metals. Within this context, this research presents the study and optimization of copper recovery of real wastewater using pulsed electrodeposition. The studied parameters – method, current, temperature, and rotation– influence both the removal of Cu and the co ...
DOI:
10.1016/j.jhazmat.2019.121416

20. A good combination of strength and ductility of ultra-coarse-grained Cu-Al alloy with coarse-grained surface layer via pre-torsional treatment

Author:
Gong, Yanli; Gu, Ji; Ni, Song; Wu, Hong; Song, Min
Source:
Micron 2020 v.129 pp. 102783
ISSN:
0968-4328
Subject:
copper,   etc   ; alloys; aluminum; deformation; mechanical properties; microstructure;     Show all 6 Subjects
Abstract:
... The trade-off between strength and ductility is a long-standing dilemma in metals and alloys. In this study, we fabricated an ultra-coarse-grained (UCG) Cu-6 wt.%Al alloy with a coarse-grained (CG) surface layer by surface mechanical attrition treatment. Pre-torsional treatment for 45°, 90° and 180° was conducted on the UCG-CG specimens, and the effects of pre-torsional treatment on the microstruc ...
DOI:
10.1016/j.micron.2019.102783