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You searched for: Journal ACS applied materials Remove constraint Journal: ACS applied materials Publication Year 2016 Remove constraint Publication Year: 2016 Source 2016 v.8 no.1 Remove constraint Source: 2016 v.8 no.1
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21. Impact of Dopant Compensation on Graded p–n Junctions in Si Nanowires

Author:
Amit, Iddo; Jeon, Nari; Lauhon, Lincoln J.; Rosenwaks, Yossi
Source:
ACS applied materials 2016 v.8 no.1 pp. 128-134
ISSN:
1944-8252
Subject:
finite element analysis; nanowires; silicon
Abstract:
... The modulation between different doping species required to produce a diode in VLS-grown nanowires (NWs) yields a complex doping profile, both axially and radially, and a gradual junction at the interface. We present a detailed analysis of the dopant distribution around the junction. By combining surface potential measurements, performed by KPFM, with finite element simulations, we show that the h ...
DOI:
10.1021/acsami.5b07746

22. Impact of Porosity and Electrolyte Composition on the Surface Charge of Hydroxyapatite Biomaterials

Author:
Espanol, Montserrat; Mestres, Gemma; Luxbacher, Thomas; Dory, Jean-Baptiste; Ginebra, Maria-Pau
Source:
ACS applied materials 2016 v.8 no.1 pp. 908-917
ISSN:
1944-8252
Subject:
biocompatible materials; electrolytes; hydroxyapatite; ions; porosity; proteins; topography; zeta potential
Abstract:
... The success or failure of a material when implanted in the body is greatly determined by the surface properties of the material and the host tissue reactions. The very first event that takes place after implantation is the interaction of soluble ions, molecules and proteins from the biological environment with the material surface leading to the formation of an adsorbed protein layer that will lat ...
DOI:
10.1021/acsami.5b10404

23. Influence of Substrate Microstructure on the Transport Properties of CVD-Graphene

Author:
Babichev, Andrey V.; Rykov, Sergey A.; Tchernycheva, Maria; Smirnov, Alexander N.; Davydov, Valery Yu.; Kumzerov, Yurii A.; Butko, Vladimir Y.
Source:
ACS applied materials 2016 v.8 no.1 pp. 240-246
ISSN:
1944-8252
Subject:
Raman spectroscopy; annealing; graphene; microstructure; nanospheres; opal; scanning electron microscopy; scanning tunneling microscopy; semiconductors; silica
Abstract:
... We report the study of electrical transport in few-layered CVD-graphene located on nanostructured surfaces in view of its potential application as a transparent contact to optoelectronic devices. Two specific surfaces with a different characteristic feature scale are analyzed: semiconductor micropyramids covered with SiO₂ layer and opal structures composed of SiO₂ nanospheres. Scanning tunneling m ...
DOI:
10.1021/acsami.5b08479

24. Insight into the Nanoscale Mechanism of Rapid H2O Transport within a Graphene Oxide Membrane: Impact of Oxygen Functional Group Clustering

Author:
Ban, Shuai; Xie, Jing; Wang, Yajun; Jing, Bo; Liu, Bei; Zhou, Hongjun
Source:
ACS applied materials 2016 v.8 no.1 pp. 321-332
ISSN:
1944-8252
Subject:
X-ray photoelectron spectroscopy; differential scanning calorimetry; diffusivity; dynamic vapor sorption method; enthalpy; graphene oxide; hydrogen bonding; hydrophilicity; models; oxygen; permeability; sorption; thermogravimetry; transmission electron microscopy
Abstract:
... Realistic models of graphene oxide membranes were developed and validated to interpret the exceptional water permeation in association with X-ray photoelectron spectroscopy, thermogravimetric and differential scanning calorimetry analysis, and dynamic vapor sorption measurements. With respect to the GO oxidization level, surface distributions of functionalized domains were analyzed in line with TE ...
DOI:
10.1021/acsami.5b08824

25. Interface and Strain Energy Revolution Texture Map To Predict Structure and Optical Properties of Sputtered PbSe Thin Films

Author:
Sun, Xigui; Gao, Kewei; Pang, Xiaolu; Yang, Huisheng
Source:
ACS applied materials 2016 v.8 no.1 pp. 625-633
ISSN:
1944-8252
Subject:
Fourier transform infrared spectroscopy; Gibbs free energy; X-ray diffraction; energy; optical properties; silicon; texture
Abstract:
... The preferred growth orientation of the sputtered lead selenide (PbSe) thin films on Si(100) substrates was thermodynamically simulated and calculated on the basis of the density functional theory. The results showed that the total free energy variation during the grain growth is dominated by the interface and strain energy minimization under certain conditions, indicating that the preferred growt ...
DOI:
10.1021/acsami.5b09724

26. Iron-Doped Carbon Nitride-Type Polymers as Homogeneous Organocatalysts for Visible Light-Driven Hydrogen Evolution

Author:
Gao, Lin-Feng; Wen, Ting; Xu, Jing-Yin; Zhai, Xin-Ping; Zhao, Min; Hu, Guo-Wen; Chen, Peng; Wang, Qiang; Zhang, Hao-Li
Source:
ACS applied materials 2016 v.8 no.1 pp. 617-624
ISSN:
1944-8252
Subject:
carbon; carbon nitride; citric acid; electrochemistry; electron transfer; energy; hydrogen; hydrogen production; impedance; iron; nanomaterials; photocatalysts; photolysis; polymers; solar radiation; solvents; spectral analysis
Abstract:
... Graphitic carbon nitrides have appeared as a new type of photocatalyst for water splitting, but their broader and more practical applications are oftentimes hindered by the insolubility or difficult dispersion of the material in solvents. We herein prepared novel two-dimensional (2D) carbon nitride-type polymers doped by iron under a mild one-pot method through preorganizing formamide and citric a ...
DOI:
10.1021/acsami.5b09684

27. Metal–Support Interactions of Platinum Nanoparticles Decorated N-Doped Carbon Nanofibers for the Oxygen Reduction Reaction

Author:
Melke, Julia; Peter, Benedikt; Habereder, Anja; Ziegler, Juergen; Fasel, Claudia; Nefedov, Alexei; Sezen, Hikmet; Wöll, Christof; Ehrenberg, Helmut; Roth, Christina
Source:
ACS applied materials 2016 v.8 no.1 pp. 82-90
ISSN:
1944-8252
Subject:
X-radiation; X-ray photoelectron spectroscopy; absorption; aromatic compounds; carbon; carbon nanofibers; catalysts; electrochemistry; electrodes; electrons; fuel cells; heat treatment; nanoparticles; oxygen; platinum; transmission electron microscopy
Abstract:
... N-doped carbon materials are discussed as catalyst supports for the electrochemical oxygen reduction reaction (ORR) in fuel cells. This work deals with the preparation of Pt nanoparticles (NPs) supported on N-doped carbon nanofibers (N-CNF) from a polyaniline nanofiber (PANI NF) precursor, and investigates the ORR activity of the produced materials. Initially, Pt NPs are deposited on PANI NFs. The ...
DOI:
10.1021/acsami.5b06225

28. Microstructure of Cu–Ag Uniform Nanoparticulate Films on Polyurethane 3D Catheters: Surface Properties

Author:
Rtimi, Sami; Sanjines, Rosendo; Pulgarin, Cesar; Kiwi, John
Source:
ACS applied materials 2016 v.8 no.1 pp. 56-63
ISSN:
1944-8252
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; catheters; cupric oxide; cuprous oxide; microstructure; nanoparticles; nanosilver; optical properties; polyurethanes; reflectance spectroscopy; silver; transmission electron microscopy
Abstract:
... The preparation, characterization, and antibacterial testing of Cu–Ag sputtered polyurethane (PU) catheters are addressed in this study. PU catheters with different atomic ratios Cu:Ag have been sputtered and led to different optical properties as followed by diffuse reflectance spectroscopy (DRS) and the surface redox properties were also different for different Cu–Ag ratios as observed by X-ray ...
DOI:
10.1021/acsami.5b09738

29. Multicompartment Microgel Beads for Co-Delivery of Multiple Drugs at Individual Release Rates

Author:
Lai, Wing-Fu; Susha, Andrei S.; Rogach, Andrey L.
Source:
ACS applied materials 2016 v.8 no.1 pp. 871-880
ISSN:
1944-8252
Subject:
drug delivery systems; drugs; fluorescence; mixing; models; polymers; quantum dots
Abstract:
... Multidrug therapy may yield higher therapeutic effects as compared to monotherapy, yet its wide application has been hampered by the limitations of conventional drug delivery systems, in which not only incompatible drugs cannot be co-delivered but also the release rates of individual co-delivered drugs cannot be tuned separately. Regarding these limitations, we adopt the microfluidic electrospray ...
DOI:
10.1021/acsami.5b10274

30. NiSix/a-Si Nanowires with Interfacial a-Ge as Anodes for High-Rate Lithium-Ion Batteries

Author:
Han, Xiang; Chen, Huixin; Li, Xin; Lai, Shumei; Xu, Yihong; Li, Cheng; Chen, Songyan; Yang, Yong
Source:
ACS applied materials 2016 v.8 no.1 pp. 673-679
ISSN:
1944-8252
Subject:
adhesion; anodes; batteries; electrical conductivity; electrochemistry; energy; germanium; nanowires; silicon
Abstract:
... Conductive metal nanowire is a promising current collector for the Si-based anode material in high-rate lithium-ion batteries. However, to harness this remarkable potential for high power density energy storage, one has to address the interfacial potential barrier that hinders the electron injection from the metal side. Herein, we present that, solely by inserting ultrathin amorphous germanium (a- ...
DOI:
10.1021/acsami.5b09783

31. Nonflammable Alginate Nanocomposite Aerogels Prepared by a Simple Freeze-Drying and Post-Cross-Linking Method

Author:
Shang, Ke; Liao, Wang; Wang, Juan; Wang, Yu-Tao; Wang, Yu-Zhong; Schiraldi, David A.
Source:
ACS applied materials 2016 v.8 no.1 pp. 643-650
ISSN:
1944-8252
Subject:
X-ray photoelectron spectroscopy; alginates; aluminum hydroxide; calorimeters; crosslinking; freeze drying; kaolin; magnesium hydroxide; microstructure; montmorillonite; nanocomposites; oxygen; scanning electron microscopy; sodium; solvents; strength (mechanics); thermogravimetry
Abstract:
... Nonflammable materials based on renewable ammonium alginate and nano fillers (nanoscale magnesium hydroxide, nanoscale aluminum hydroxide, layered double hydroxide, sodium montmorillonite, and Kaolin) were fabricated through a simple, environmentally friendly freeze-drying process, in which water was used as a solvent. A simple and economic post-cross-linking method was used to obtain homogeneous ...
DOI:
10.1021/acsami.5b09768

32. Optical Actuation of Inorganic/Organic Interfaces: Comparing Peptide-Azobenzene Ligand Reconfiguration on Gold and Silver Nanoparticles

Author:
Palafox-Hernandez, J. Pablo; Lim, Chang-Keun; Tang, Zhenghua; Drew, Kurt L. M.; Hughes, Zak E.; Li, Yue; Swihart, Mark T.; Prasad, Paras N.; Knecht, Marc R.; Walsh, Tiffany R.
Source:
ACS applied materials 2016 v.8 no.1 pp. 1050-1060
ISSN:
1944-8252
Subject:
gold; isomerization; ligands; nanoparticles; nanosilver; peptides; silver
Abstract:
... Photoresponsive molecules that incorporate peptides capable of material-specific recognition provide a basis for biomolecule-mediated control of the nucleation, growth, organization, and activation of hybrid inorganic/organic nanostructures. These hybrid molecules interact with the inorganic surface through multiple noncovalent interactions which allow reconfiguration in response to optical stimul ...
DOI:
10.1021/acsami.5b11989

33. Pt- and TCO-Free Flexible Cathode for DSSC from Highly Conducting and Flexible PEDOT Paper Prepared via in Situ Interfacial Polymerization

Author:
Anothumakkool, Bihag; Agrawal, Ishita; Bhange, Siddheshwar N.; Soni, Roby; Game, Onkar; Ogale, Satishchandra B.; Kurungot, Sreekumar
Source:
ACS applied materials 2016 v.8 no.1 pp. 553-562
ISSN:
1944-8252
Subject:
catalytic activity; cathodes; cellulose; coatings; electrochemistry; glass; oxides; paper; photovoltaic cells; polymerization
Abstract:
... Here, we report the preparation of a flexible, free-standing, Pt- and TCO-free counter electrode in dye-sensitized solar cell (DSSC)-derived from polyethylenedioxythiophene (PEDOT)-impregnated cellulose paper. The synthetic strategy of making the thin flexible PEDOT paper is simple and scalable, which can be achieved via in situ polymerization all through a roll coating technique. The very low she ...
DOI:
10.1021/acsami.5b09579

34. Quasi-Instantaneous Bacterial Inactivation on Cu–Ag Nanoparticulate 3D Catheters in the Dark and Under Light: Mechanism and Dynamics

Author:
Rtimi, Sami; Sanjines, Rosendo; Pulgarin, Cesar; Kiwi, John
Source:
ACS applied materials 2016 v.8 no.1 pp. 47-55
ISSN:
1944-8252
Subject:
Fourier transform infrared spectroscopy; catheters; coatings; copper; cytotoxicity; hydrophilicity; hydrophobicity; ions; irradiation; mass spectrometry; oxides; polyurethanes; semiconductors; silver
Abstract:
... The first evidence for Cu–Ag (50%/50%) nanoparticulate hybrid coatings is presented leading to a complete and almost instantaneous bacterial inactivation in the dark (≤5 min). Dark bacterial inactivation times on Cu–Ag (50%/50%) were observed to coincide with the times required by actinic light irradiation. This provides the evidence that the bimetal Cu–Ag driven inactivation predominates over a C ...
DOI:
10.1021/acsami.5b09730

35. Real Colorimetric Thrombin Aptasensor by Masking Surfaces of Catalytically Active Gold Nanoparticles

Author:
Chen, Zhengbo; Tan, Lulu; Hu, Liangyu; Zhang, Yimeng; Wang, Shaoxiong; Lv, Fanyi
Source:
ACS applied materials 2016 v.8 no.1 pp. 102-108
ISSN:
1944-8252
Subject:
aminophenols; aptasensors; blood serum; color; colorimetry; cost effectiveness; detection limit; humans; nanogold; p-nitrophenol; thrombin
Abstract:
... We presented a simple, cost-effective, and ultrasensitive colorimetric approach for visually detecting thrombin by the catalytic amplification of gold nanoparticles (AuNPs) and aptamer-thrombin recognition. Thrombin can be quantified in the presence of catalytic AuNP surface by using color-change time of 4-nitrophenol. Without thrombin, yellow 4-nitrophenol can freely access the surface of AuNP an ...
DOI:
10.1021/acsami.5b08975

36. Robust Design of a Particle-Free Silver-Organo-Complex Ink with High Conductivity and Inkjet Stability for Flexible Electronics

Author:
Vaseem, Mohammad; McKerricher, Garret; Shamim, Atif
Source:
ACS applied materials 2016 v.8 no.1 pp. 177-186
ISSN:
1944-8252
Subject:
adhesion; electronics; radio waves; reducing agents; shelf life; silver; standard operating procedures; temperature; viscosity
Abstract:
... Currently, silver-nanoparticle-based inkjet ink is commercially available. This type of ink has several serious problems such as a complex synthesis protocol, high cost, high sintering temperatures (∼200 °C), particle aggregation, nozzle clogging, poor shelf life, and jetting instability. For the emerging field of printed electronics, these shortcomings in conductive inks are barriers for their wi ...
DOI:
10.1021/acsami.5b08125

37. Self-Actuation of Liquid Metal via Redox Reaction

Author:
Gough, Ryan C.; Dang, Jonathan H.; Moorefield, Matthew R.; Zhang, George B.; Hihara, Lloyd H.; Shiroma, Wayne A.; Ohta, Aaron T.
Source:
ACS applied materials 2016 v.8 no.1 pp. 6-10
ISSN:
1944-8252
Subject:
alloys; anodes; gallium; hydrophilicity; oxygen
Abstract:
... Presented here is a method for actuating a gallium-based liquid-metal alloy without the need for an external power supply. Liquid metal is used as an anode to drive a complementary oxygen reduction reaction, resulting in the spontaneous growth of hydrophilic gallium oxide on the liquid-metal surface, which induces flow of the liquid metal into a channel. The extent and duration of the actuation ar ...
DOI:
10.1021/acsami.5b09466

38. Silica Foams for Fire Prevention and Firefighting

Author:
Vinogradov, Alexander V.; Kuprin, D.S.; Abduragimov, I.M.; Kuprin, G.N.; Serebriyakov, Evgeniy; Vinogradov, Vladimir V.
Source:
ACS applied materials 2016 v.8 no.1 pp. 294-301
ISSN:
1944-8252
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; biocompatibility; biodegradation; chemical structure; durability; explosions; fire fighting; fires; foams; gelation; insulating materials; nanoparticles; particle size distribution; scanning electron microscopy; silica; specific heat; thermal stability; transmission electron microscopy; viscosity
Abstract:
... We report the new development of fire-extinguishing agents employing the latest technology of fighting and preventing fires. The in situ technology of fighting fires and explosions involves using large-scale ultrafast-gelated foams, which possess new properties and unique characteristics, in particular, exceptional thermal stability, mechanical durability, and full biocompatibility. We provide a d ...
DOI:
10.1021/acsami.5b08653

39. Spectroscopic and Intensity Modulated Photocurrent Imaging of Polymer/Fullerene Solar Cells

Author:
Gao, Yongqian; Wise, Adam J.; Thomas, Alan K.; Grey, John K.
Source:
ACS applied materials 2016 v.8 no.1 pp. 285-293
ISSN:
1944-8252
Subject:
fullerene; image analysis; ionizing radiation; oxygen; photovoltaic cells; polymers; spectroscopy; temperature
Abstract:
... Molecular spectroscopic and intensity modulated photocurrent spectroscopy (IMPS) imaging techniques are used to map morphology-dependent charge recombination in organic polymer/fullerene solar cells. IMPS uses a small (∼10%) sinusoidal modulation of an excitation light source and photocurrent responses are measured while modulation frequencies are swept over several decades (∼1 Hz–20 kHz). Solar c ...
DOI:
10.1021/acsami.5b08724

40. Understanding and Tuning the Intrinsic Hydrophobicity of Rare-Earth Oxides: A DFT+U Study

Author:
Carchini, Giuliano; García-Melchor, Max; Łodziana, Zbigniew; López, Núria
Source:
ACS applied materials 2016 v.8 no.1 pp. 152-160
ISSN:
1944-8252
Subject:
adsorption; aluminum; aluminum oxide; cations; ceric oxide; dissociation; geometry; hydrophobicity; methodology; oxygen; wettability
Abstract:
... Rare-earth oxides (REOs) possess a remarkable intrinsic hydrophobicity, making them candidates for a myriad of applications. Although the superhydrophobicity of REOs has been explored experimentally, the atomistic details of the structure at the oxide–water interface are still not well understood. In this work, we report a density functional theory study of the interaction between water and CeO₂, ...
DOI:
10.1021/acsami.5b07905