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https://www.readbyqxmd.com/read/28806656/sensitive-surface-enhanced-raman-scattering-of-tio2-ag-nanowires-induced-by-photogenerated-charge-transfer
#1
Xin Zhao, Weiwei Zhang, Chuchu Peng, Yujie Liang, Wenzhong Wang
In this work, the semiconductor TiO2 nanowires were successfully coupled with plasmonic metal Ag nanoparticles to fabricate hybrid nanostructures with enhanced sensitive Raman substrate. The SERS activities of fabricated hybrid nanostructures were evaluated by detecting the Raman signals of R6G molecules. The fabricated TiO2/Ag nanowire/nanoparticle hybrid nanostructures show sensitive detection ability for R6G molecules. Based on the band structures of Ag nanoparticle, TiO2 nanowire and R6G molecule, the enhanced sensitive SERS activities of hybrid nanostructures is ascribed to an efficient charge transfer process, in which the photogenerated electrons transfer to the conduction band of TiO2 nanowires from metal Ag nanoparticles, and then to LUMO level of R6G molecules, leading to enhanced SERS activities...
August 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28805870/an-enhanced-degree-of-charge-transfer-in-dye-sensitized-solar-cells-with-a-zno-tio2-n3-ag-structure-as-revealed-by-surface-enhanced-raman-scattering
#2
Xiaolei Wang, Peng Li, Xiao Xia Han, Yasutaka Kitahama, Bing Zhao, Yukihiro Ozaki
A number of recent studies have focused on improving the performance of dye-sensitized solar cells (DSSCs). Cells with a ZnO-TiO2/N3/Ag structure have attracted particular attention because of their excellent power conversion efficiencies. Using a dendritic crystal ZnO-TiO2 composite semiconductor and Ag in conjunction leads to different charge-transfer (CT) processes, and this is the main theoretical basis for the improvement of DSSC performances. Thus, in the present study, TiO2/N3, ZnO/N3, ZnO-TiO2/N3, TiO2/N3/Ag, ZnO/N3/Ag, and ZnO-TiO2/N3/Ag assemblies have been fabricated and their CT processes have been monitored by using surface-enhanced Raman scattering (SERS) spectra, with particular focus on the differences caused by the synergistic effect of the ZnO-TiO2 component...
August 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28796518/plasmonic-photovoltaic-cells-with-dual-functional-gold-silver-and-copper-halfshell-arrays
#3
Ling Wu, Gyu Min Kim, Hiroyasu Nishi, Tetsu Tatsuma
Solid-state photovoltaic cells based on plasmon-induced charge separation (PICS) have attracted growing attention during the last decade. However, the power conversion efficiency (PCE) of the previously reported devices, generally using dispersed metal nanoparticles as light absorbers, has not been sufficiently high. Here we report simpler plasmonic photovoltaic cells with interconnected Au, Ag, and Cu halfshell arrays deposited on SiO2@TiO2 colloidal crystals, which serve both as a plasmonic light absorber and as a current collector...
August 10, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28780436/particle-emission-rates-during-electrostatic-spray-deposition-of-tio2-nanoparticle-based-photoactive-coating
#4
Antti J Koivisto, Alexander C Ø Jensen, Kirsten I Kling, Jens Kling, Hans Christian Budtz, Ismo K Koponen, Ilse Tuinman, Tareq Hussein, Keld A Jensen, Asger Nørgaard, Marcus Levin
Here, we studied the particle release rate during Electrostatic spray deposition of anatase-(TiO2)-based photoactive coating onto tiles and wallpaper using a commercially available electrostatic spray device. Spraying was performed in a 20.3m(3) test chamber while measuring concentrations of 5.6nm to 31μm-size particles and volatile organic compounds (VOC), as well as particle deposition onto room surfaces and on the spray gun user hand. The particle emission and deposition rates were quantified using aerosol mass balance modelling...
July 29, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28780338/facile-functionalization-of-cotton-with-nanostructured-silver-titania-for-visible-light-plasmonic-photocatalysis
#5
Marwa Abid, Soraa Bouattour, Ana M Ferraria, David S Conceição, Ana P Carapeto, Luís F Vieira Ferreira, Ana M Botelho do Rego, Mohamed M Chehimi, Manuel Rei Vilar, Sami Boufi
In the present work, a simple, reliable and cost-effective approach to functionalize cotton fabrics with Ag-TiO2 nanoparticles strongly bound to the fibres and with visible-light-responsive photo-activity is presented. The hybrid cotton-Ag-TiO2 fabrics were characterized by Raman, AFM, FE-SEM, TGA, XPS GSDR, and LIL to confirm the generation of metallic Ag nanoparticles and crystalline TiO2 and investigate how the concentration of Ag and TiO2 precursors affected the morphology and the luminescence properties of the nanostructured layer grafted on the cotton fibres...
July 29, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28767221/diffusion-bonding-of-metal-wires-directly-to-the-functional-metal-oxide-semiconductors-for-forming-reliable-electrical-contacts
#6
Faramarz Hossein-Babaei, Mohsen Gharesi, Maryam Moalaghi
Forming reliable ohmic contacts to the functional metal oxide semiconductors has always been problematic in fabricating sensors and actuators. The common practice is to establish wire bonds to the metallic films previously deposited/printed over or under the oxide layer. Here, we describe a method for the diffusion bonding of metallic wire segments directly to the oxide layer surface, and demonstrate the reproducible formation of contacts with reliable mechanical and electrical qualities. Bonding is made at elevated temperatures in the 350-500 °C range under die pressure...
August 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28753508/photocatalytic-ozonation-using-doped-tio2-catalysts-for-the-removal-of-parabens-in-water
#7
João F Gomes, Inês Leal, Katarzyna Bednarczyk, Marta Gmurek, Marek Stelmachowski, Magdalena Diak, M Emília Quinta-Ferreira, Raquel Costa, Rosa M Quinta-Ferreira, Rui C Martins
Conventional wastewater treatments are inefficient for the removal of parabens. The aim of this study was finding a suitable solution using ozone and UVA irradiation combined with TiO2 catalysts doped with different noble metals (Ag, Pt, Pd, Au). Photocatalytic ozonation required lower amounts of ozone for higher efficiency on the removal of parabens, chemical oxygen demand (COD) and total organic carbon (TOC). The best catalyst for the initial contaminants degradation was 0.5% Ag-TiO2 leading to total parabens removal using 46mgO3/L...
July 25, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28719067/one-pot-synthesis-of-cu-nanoclusters-decorated-brookite-tio2-quasi-nanocubes-for-enhanced-activity-and-selectivity-of-co2-photoreduction-to-ch4
#8
Tianyou Peng, Jingpeng Jin, Jiang Luo, Lin Zan
A new kind of metallic Cu-loaded brookite TiO2 composite, in which Cu nanoclusters with small size of 1-3 nm are decorated on brookite TiO2 quasi nanocubes (BTN) surfaces (hereafter referred as Cu-BTN), is synthesized via a one-pot hydrothermal process, and then used as photocatalyst for CO2 reduction. It was found that the decoration of Cu nanoclusters on BTN surfaces can improve the activity and selectivity of CO2 photoreduction to CH4 production, and 1.5% Cu-BTN gives the maximum overall photocatalytic activity (150...
July 18, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28717799/interface-interactions-and-enhanced-room-temperature-ferromagnetism-of-ag-ceo2-nanostructures
#9
Shih-Yun Chen, Eric Tseng, Yi-Ta Lai, William Lee, Alexandre Gloter
Enhancement of room temperature ferromagnetism (RTFM) has been achieved with core-shell metal-oxide nanoparticles (Ag@CeO2). To enhance the magnetic properties, interfacial charge transfer is achieved via the formation of a core-shell interface. Furthermore, by varying the shell thicknesses, additional control of the RTFM can be obtained. The Ag@CeO2 core-shell nanoparticles are synthesized successfully via a two-step method. Ag nanoparticles (NPs) are first synthesized on a TiO2 substrate by a thermally assisted photoreduction method, and then CeO2 NPs are deposited on the surface of Ag NPs by chemical reduction...
August 3, 2017: Nanoscale
https://www.readbyqxmd.com/read/28701638/antibacterial-activity-cytotoxicity-and-mechanical-behavior-of-nano-enhanced-denture-base-resin-with-different-kinds-of-inorganic-antibacterial-agents
#10
Rongrong Chen, Zhihui Han, Zhuoli Huang, Junu Karki, Chenxin Wang, Bangshang Zhu, Xiuyin Zhang
Silanized aluminum borate whiskers (ABWs) of 4 wt%, silanized zirconium dioxide nanoparticles (nano-ZrO2) of 2 wt% were mixed with polymethyl methacrylate (PMMA) powder to get ZrO2-ABWs/PMMA composites. Titanium dioxide (TiO2), silver-supported titanium dioxide (Ag/TiO2), silver-supported zirconium phosphate (Novaron) and tetrapod-like zinc oxide whiskers (T-ZnOw) antibacterial agents of 3 wt% were mixed with ZrO2-ABWs/PMMA composites respectively to fabricate standard specimens. Plaque biofilms on the specimens surface were investigated for colony-forming units (CFUs)...
July 12, 2017: Dental Materials Journal
https://www.readbyqxmd.com/read/28697649/enhanced-photocatalytic-degradation-of-sulfamethoxazole-by-deposition-of-au-ag-and-cu-metallic-nanoparticles-on-tio2
#11
Rodolfo Zanella, Edwin Avella, Rosa María Ramírez Zamora, Felipe Castillón Barraza, Juan C Durán-Álvarez
Mono- (Au, Ag and Cu) and bi-metallic (Au-Ag and Au-Cu) nanoparticles were deposited on TiO2 and tested for the photocatalytic degradation of sulfamethoxazole using either UV-C or simulated sunlight. The optimal loading of metallic nanoparticles was determined as 1.5 wt. % for Au and Ag, and 1.0 wt. % for Cu. In the case of bi-metallic nanoparticles only the ratio 1:0.5 wt. % for both Au-Ag and Au-Cu was tested. In experiments using UV-C light, the highest degradation performance was found for Ag/TiO2, while bi-metallic nanoparticles supported on TiO2 also showed increased photocatalytic activity compared with unmodified TiO2...
July 12, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28696092/synthesis-of-mesoporous-co2-doped-tio2-nanodisks-derived-from-metal-organic-frameworks-with-improved-sodium-storage-performance
#12
Zhensheng Hong, Meiling Kang, Xiaohui Chen, Kaiqiang Zhou, Zhigao Huang, Mingdeng Wei
TiO2 is a most promising anode candidate for rechargeable Na-ion batteries (NIBs) due to its appropriate working voltage, low cost and superior structural stability during chage/discharge process. Nevertheless, it suffers from intrinsically low electrical conductivity. Herein, we report an in-situ synthesis of Co2+ doped TiO2 through the thermal treatment of metal organic frameworks precursors of MIL-125(Ti)-Co as a superior anode material for NIBs. The Co2+ doped TiO2 possesses uniform nanodisk morphology, a large surface area and mesoporous structure with narrow pore distribution...
July 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28660756/photoelectrochemical-performance-of-the-ag-iii-based-oxygen-evolving-catalyst
#13
Fabrizio Sordello, Manuel Ghibaudo, Claudio Minero
We report the electrosynthesis of a water oxidation catalyst based on Ag oxides (AgCat). The deposited AgCat is composed of mixed valence crystalline Ag oxides with the presence of particle aggregates whose size is ∼1 μm. This catalyst, coupled with TiO2 and hematite, and under photoelectrochemical conditions, substantially increases photocurrents in a wide range of applied potentials compared with bare and Co-Pi-modified photocatalysts. AgCat can sustain current densities comparable with other water oxidation catalysts...
July 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28654287/near-infrared-and-two-wavelength-electrochromism-based-on-nanocrystalline-tio2-films-functionalized-with-ruthenium-amine-conjugated-complexes
#14
Zhi-Juan Li, Jiang-Yang Shao, Yu-Wu Zhong
Two cyclometalated ruthenium complexes 2 and 4 containing a redox-active amine substituent and three carboxylic acid groups were synthesized, where the ruthenium ion and the amine site were separated by a phenyl or biphenyl bridge for 2 and 4, respectively. Nanocrystalline TiO2 films on fluorine doped SnO2 (FTO)/glass substrates anchored with 2 or 4 were prepared. These films display two consecutive anodic waves in the potential region between +0.1 and +1.0 V vs Ag/AgCl. Among four organic solvents examined, the FTO/TiO2/2 film displays the best cyclic electrochemical stability in ClCH2CH2Cl...
July 17, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28643002/genotoxicity-testing-of-different-surface-functionalized-sio2-zro2-and-silver-nanomaterials-in-3d-human-bronchial-models
#15
Andrea Haase, Nils Dommershausen, Markus Schulz, Robert Landsiedel, Philipp Reichardt, Benjamin-Christoph Krause, Jutta Tentschert, Andreas Luch
Inhalation is considered a critical uptake route for NMs, demanding for sound toxicity testing using relevant test systems. This study investigates cytotoxicity and genotoxicity in EpiAirway™ 3D human bronchial models using 16 well-characterized NMs, including surface-functionalized 15 nm SiO2 (4 variants), 10 nm ZrO2 (4), and nanosilver (3), ZnO NM-110, TiO2 NM-105, BaSO4 NM-220, and two AlOOH NMs. Cytotoxicity was assessed by LDH and ATP assays and genotoxicity by the alkaline comet assay. For 9 NMs, uptake was investigated using inductively coupled plasma-mass spectrometry (ICP-MS)...
June 22, 2017: Archives of Toxicology
https://www.readbyqxmd.com/read/28639671/construction-of-unique-two-dimensional-mos2-tio2-hybrid-nanojunctions-mos2-as-a-promising-cost-effective-cocatalyst-toward-improved-photocatalytic-reduction-of-co2-to-methanol
#16
Wenguang Tu, Yichang Li, Libang Kuai, Yong Zhou, Qinfeng Xu, Haijin Li, Xiaoyong Wang, Min Xiao, Zhigang Zou
Two-dimensional MoS2 nanosheets were in situ grown on TiO2 nanosheets to form two-dimensional (2D) hybrid nanojunctions, with which MoS2 nanosheets compactly contact with TiO2 to increase the interfacial area. MoS2 was identified as a promising cost-effective substitute for noble metal cocatalysts such as Pt, Au, and Ag, and shows superior activity and selectivity for reducing CO2 to CH3OH in aqueous solution to these metal cocatalysts under UV-vis light irradiation. The photo-luminescence (PL) spectra and transient time-resolved PL decay measurements reveal that the fast electron transfer from TiO2 to MoS2 can minimize charge recombination losses to improve the conversion efficiency of photoreduction...
July 6, 2017: Nanoscale
https://www.readbyqxmd.com/read/28639026/regulation-of-engineered-nanomaterials-current-challenges-insights-and-future-directions
#17
Racliffe W S Lai, Katie W Y Yeung, Mana M N Yung, Aleksandra B Djurišić, John P Giesy, Kenneth M Y Leung
Substantial production and wide applications of engineered nanomaterials (ENMs) have raised concerns over their potential influences on the environment and humans. However, regulations of products containing ENMs are scarce, even in countries with the greatest volume of ENMs produced, such as the United States and China. After a comprehensive review of life cycles of ENMs, five major challenges to regulators posed by ENMs are proposed in this review: (a) ENMs exhibit variable physicochemical characteristics, which makes them difficult for regulators to establish regulatory definition; (b) Due to diverse sources and transport pathways for ENMs, it is difficult to monitor or predict their fates in the environment; (c) There is a lack of reliable techniques for quantifying exposures to ENMs; (d) Because of diverse intrinsic properties of ENMs and dynamic environmental conditions, it is difficult to predict bioavailability of ENMs on wildlife and the environment; and (e) There are knowledge gaps in toxicity and toxic mechanisms of ENMs from which to predict their hazards...
June 22, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28629075/fabrication-of-chitosan-au-tio2-nanotube-based-dry-electrodes-for-electroencephalography-recording
#18
Yanjuan Song, Penghai Li, Mingji Li, Hongji Li, Cuiping Li, Dazhi Sun, Baohe Yang
In this paper, we describe a method for fabricating dry electrodes for use in recording electroencephalograms (EEGs), which are based on the use of chitosan (Ch), gold (Au) particles, and titanium dioxide (TiO2) nanotube arrays deposited on titanium (Ti) thin sheets. The samples were characterized by scanning electron microscopy, X-ray diffraction, electrochemical impedance spectroscopy, and EEG signal collection. The TiO2 nanotube arrays were grown on the Ti thin sheet by an electrochemical anodic oxidation method...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28626359/noble-metal-modified-octahedral-anatase-titania-particles-with-enhanced-activity-for-decomposition-of-chemical-and-microbiological-pollutants
#19
Z Wei, M Endo, K Wang, E Charbit, A Markowska-Szczupak, B Ohtani, E Kowalska
Octahedral anatase particles (OAPs) were prepared by hydrothermal (HT) reaction of titanate nanowires (TNWs). OAPs were modified with noble metals (Au, Ag, Cu and Pt) by two photodeposition methods: in the absence and in the initial presence of oxygen in the system. Photocatalytic activities for oxidative decomposition of acetic acid and anaerobic dehydrogenation of methanol under UV/vis irradiation and for oxidation of 2-propanol under visible light irradiation were investigated. Antibacterial activities for bacteria (Escherichia coli) and fungi (Candida albicans) were investigated in the dark and under UV irradiation and/or visible light irradiation...
June 15, 2017: Chemical Engineering Journal
https://www.readbyqxmd.com/read/28605067/nanometer-scale-phase-transformation-determines-threshold-and-memory-switching-mechanism
#20
Byeong-Gyu Chae, Jae-Bok Seol, Jeong-Hwan Song, Kyungjoon Baek, Sang-Ho Oh, Hyunsang Hwang, Chan-Gyung Park
Creation of nanometer-scale conductive filaments in resistive switching devices makes them appealing for advanced electrical applications. While in situ electrical probing transmission electron microscopy promotes fundamental investigations of how the conductive filament comes into existence, it does not provide proof-of-principle observations for the filament growth. Here, using advanced microscopy techniques, electrical, 3D compositional, and structural information of the switching-induced conductive filament are described...
August 2017: Advanced Materials
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