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Ag TiO2

Pascal Nbelayim, Go Kawamura, Wai Kian Tan, Hiroyuki Muto, Atsunori Matsuda
The use of plasmonic nanoparticles (NPs) in dye-sensitized solar cells (DSSCs) in an effort to enhance their power conversion efficiencies (PCEs) increases light absorbance of the cells but also affect their electron dynamics. This has contributed to the failure of plasmonic NPs to make the expected high impact of PCE enhancement. Herein, we investigated the wide range effects of plasmonic NPs on the performance of DSSCs, using extended characterization and a systematic approach. We prepared DSSCs using Ag@TiO2 NPs-doped TiO2 photoanodes...
November 16, 2017: Scientific Reports
Rebecca A Scheidt, Gergely F Samu, Csaba Janáky, Prashant V Kamat
The charging of a mesoscopic TiO2 layer in a metal halide perovskite solar cell can influence the overall power conversion efficiency. By employing CsPbBr3 films deposited on a mesoscopic TiO2 film, we have succeeded in probing the influence of electrochemical bias on the charge carrier recombination process. The transient absorption spectroscopy experiments conducted at different applied potentials indicate a decrease in the charge carrier lifetimes of CsPbBr3 as we increase the potential from -0.6 to +0.6 V vs Ag/AgCl...
November 21, 2017: Journal of the American Chemical Society
Iris Hansjosten, Juliane Rapp, Luisa Reiner, Ruben Vatter, Susanne Fritsch-Decker, Ravindra Peravali, Taina Palosaari, Elisabeth Joossens, Kirsten Gerloff, Peter Macko, Maurice Whelan, Douglas Gilliland, Isaac Ojea-Jimenez, Marco P Monopoli, Louise Rocks, David Garry, Kenneth Dawson, Peter J F Röttgermann, Alexandra Murschhauser, Joachim O Rädler, Selina V Y Tang, Pete Gooden, Marie-France A Belinga-Desaunay, Abdullah O Khan, Sophie Briffa, Emily Guggenheim, Anastasios Papadiamantis, Iseult Lynch, Eugenia Valsami-Jones, Silvia Diabaté, Carsten Weiss
Manufactured nanomaterials (MNMs) selected from a library of over 120 different MNMs with varied compositions, sizes, and surface coatings were tested by four different laboratories for toxicity by high-throughput/-content (HT/C) techniques. The selected particles comprise 14 MNMs composed of CeO2, Ag, TiO2, ZnO and SiO2 with different coatings and surface characteristics at varying concentrations. The MNMs were tested in different mammalian cell lines at concentrations between 0.5 and 250 µg/mL to link physical-chemical properties to multiple adverse effects...
November 8, 2017: Archives of Toxicology
Bartosz Bartosewicz, Marta Michalska-Domańska, Malwina Liszewska, Dariusz Zasada, Bartłomiej J Jankiewicz
Core-shell nanostructures have found applications in many fields, including surface enhanced spectroscopy, catalysis and solar cells. Titania-coated noble metal nanoparticles, which combine the surface plasmon resonance properties of the core and the photoactivity of the shell, have great potential for these applications. However, the controllable synthesis of such nanostructures remains a challenge due to the high reactivity of titania precursors. Hence, a simple titania coating method that would allow better control over the shell formation is desired...
2017: Beilstein Journal of Nanotechnology
Mounir Gaidi, Khaled Trabelsi, Anouar Hajjaji, Mohamed Lassad Chourou, Abdulaziz Al Hazza, Brahim Bessais, My Ali El Khakani
Homogeneous decoration of TiO2 nanotubes (NTs) by Ag metallic nanoparticles (NPs) was carried out by a relatively simple photoreduction process. This Ag-NPs decoration was found to improve the photoconversion efficiency of the TiO2-NTs based photoanodes. The X-ray photoelectron spectroscopy and X-ray diffraction analyses confirmed that all the Ag-NPs are metallic and the underlying TiO2-NTs crystallize in the anatase phase after their annealing at 400°C, respectively. Transmission electron microscopy observations have confirmed the effective decoration of the TiO2-NTs' surface by Ag-NPs, and allowed to measure the average Ag-NPs size, which was found to increase linearly from (4 ± 2) nm to (16 ± 4) nm when the photoreduction time is increased from 5 to 20 min...
October 30, 2017: Nanotechnology
Q Song, L Li, N Zhuo, H N Zhang, X Chen, Y X Li
Taking cetyltrimethylammonium bromide (CTAB) as the template and using TiO2 as the substrate, coral-globular-like composite Ag/TiO2-SnO2 (CTAB) was successfully synthesized by the sol-gel combined with a temperature-programmed treatment method. X-ray diffraction, scanning electron microscopy (SEM), UV-vis diffuse reflectance spectroscopy, X-ray photoelectron spectroscopy, SEM combined with X-ray energy dispersive spectroscopy, and N2 adsorption-desorption tests were employed to characterize samples' crystalline phase, chemical composition, morphology and surface physicochemical properties...
October 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Hongbo Xia, Suli Wu, Jiajie Bi, Shufen Zhang
Here a simple and effective method was explored to fabricate M/TiO2 (M = Ag, Au) composites, which required neither pre-treatment of TiO2 nor any additives as reducing agent. Using amorphous TiO2 spheres functionalized with SH groups as starting materials, the noble metallic ions (Ag, Au) can be adsorbed by TiO2 due to their special affinity with SH groups, which is beneficial to the uniform dispersion of metallic ions on the surface of TiO2. Then the adsorbed ions were reduced to form noble metal nanoparticles by heating process (95 °C) directly without additive as reduction agent...
October 23, 2017: Nanotechnology
Giovanni Di Liberto, Valentina Pifferi, Leonardo Lo Presti, Michele Ceotto, Luigi Falciola
A concerted theoretical and experimental investigation of the silver/anatase hybrid nanocomposite, a very promising material for advanced sensing applications, is presented. We measure its exceptional electrochemical virtues in terms of current densities and reproducibility, providing their explanation at the atomic-scale level and demonstrating how and why silver acts as a positive electrode. Using periodic plane-wave DFT calculations, we estimate the overall amount of electron transfer toward the semiconductor side of the interface at equilibrium...
November 2, 2017: Journal of Physical Chemistry Letters
Shuangyan Liu, Shencheng Fu, Xiuxiu Han, Xinnong Wang, Ruiya Ji, Xintong Zhang, Yichun Liu
Stability of data storage is essential for optical information processing. TiO2 nanoporous films loaded with small-sized Ag nanoparticles thus attracted much attention due to their fast and polarization-sensitive photochemical response, which is able to realize optical phase modulation and high-density optical memory. However, little attention was given to the modulation of the silver ion migration, which plays a key role in anti-erasure of the recorded hologram. In this paper, the strong coupling of two phase gratings was achieved by long-term recording in the Ag-TiO2 film irradiated with a pair of coherent left- and right-hand circular polarization lights from a Blu-ray (∼405  nm) laser...
August 20, 2017: Applied Optics
Xiuxiu Han, Shencheng Fu, Xintong Zhang, Shuang Lu, Shuangyan Liu, Xinnong Wang, Ruiya Ji, Xiuli Wang, Yichun Liu, Jinhuan Li
Stable and controllable optical memory is necessary for the development of current information technology. In this context, Ag/TiO2 films have received much attention for their photosensitivity in wavelength and polarization, which can be applied to high-density optical storage. Here, we carried out dual-wavelength holographic recording using 403.4 nm and 532 nm lasers, and obtained mixed microfringes based on selective photodissolution of Ag nanoparticles of various sizes in TiO2 nanoporous films. Two recording methods of simultaneous and sequential multiplexing were investigated...
October 1, 2017: Applied Optics
Lan Yuan, Bo Weng, Juan Carlos Colmenares, Yugang Sun, Yi-Jun Xu
Promising semiconductor-based photocatalysis toward achieving efficient solar-to-chemical energy conversion is an ideal strategy in response to the growing worldwide energy crisis, which however is often practically limited by the insufficient photoinduced charge-carrier separation. Here, a rational cascade engineering of Au nanoparticles (NPs) decorated 2D/2D Bi2 WO6 -TiO2 (B-T) binanosheets to foster the photocatalytic efficiency through the manipulated flow of multichannel-enhanced charge-carrier separation and transfer is reported...
October 17, 2017: Small
Hailian Tang, Yang Su, Bingsen Zhang, Adam F Lee, Mark A Isaacs, Karen Wilson, Lin Li, Yuegong Ren, Jiahui Huang, Masatake Haruta, Botao Qiao, Xin Liu, Changzi Jin, Dangsheng Su, Junhu Wang, Tao Zhang
Supported metal catalysts play a central role in the modern chemical industry but often exhibit poor on-stream stability. The strong metal-support interaction (SMSI) offers a route to control the structural properties of supported metals and, hence, their reactivity and stability. Conventional wisdom holds that supported Au cannot manifest a classical SMSI, which is characterized by reversible metal encapsulation by the support upon high-temperature redox treatments. We demonstrate a classical SMSI for Au/TiO2, evidenced by suppression of CO adsorption, electron transfer from TiO2 to Au nanoparticles, and gold encapsulation by a TiO x overlayer following high-temperature reduction (reversed by subsequent oxidation), akin to that observed for titania-supported platinum group metals...
October 2017: Science Advances
Nan Hao, Rong Hua, Saibo Chen, Ying Zhang, Zhou Zhou, Jing Qian, Qian Liu, Kun Wang
In this study, Ag/TiO2/3D nitrogen doped graphene hydrogel (3DNGH) was prepared for the first time and the photocurrent intensity of this material was greatly enhanced, which was attributed to the multiple enhancements accomplished in one step. The porous structure of 3DNGH could provide an exceptionally large accessible surface area, which was beneficial for the anchoring of Ag and TiO2 nanoparticles. The introduction of nitrogen doped graphene and metal nanoparticles was capable to facilitate the charge separation efficiency and accelerate the transfer rate of the photogenerated electron-hole pairs...
October 8, 2017: Biosensors & Bioelectronics
Shaomin Liu, Dinglong Zhu, Jinglin Zhu, Qing Yang, Huijun Wu
A cube-like Ag@AgCl-doped TiO2/sepiolite (denoted Ag@AgCl-TiO2/sepiolite) was successfully synthesized via a novel method. X-ray diffraction, scanning electron microscopy, energy dispersion X-ray fluorescence, X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and diffuse reflectance ultraviolet-visible spectroscopy were performed to determine the structure and physicochemical properties of Ag@AgCl-TiO2/sepiolite. SEM micrographs revealed that Ag@AgCl nanoparticles and TiO2 film are well deposited on the surface of tube-like sepiolite...
October 2017: Journal of Environmental Sciences (China)
Hugh G Manning, Subhajit Biswas, Justin D Holmes, John J Boland
Nonpolar resistive switching (RS), a combination of bipolar and unipolar RS, is demonstrated for the first time in a single nanowire (NW) system. Exploiting Ag@TiO2 core-shell (CS) NWs synthesized by postgrowth shell formation, the switching mode is controlled by adjusting the current compliance effectively, tailoring the electrical polarity response. We demonstrate ON/OFF ratios of 10(5) and 10(7) for bipolar and unipolar modes, respectively. In the bipolar regime, retention times could be controlled up to 10(3) s, and in the unipolar mode, >10(6) s was recorded...
November 8, 2017: ACS Applied Materials & Interfaces
Ajay Kumar Baranwal, Hideaki Masutani, Hidetaka Sugita, Hiroyuki Kanda, Shusaku Kanaya, Naoyuki Shibayama, Yoshitaka Sanehira, Masashi Ikegami, Youhei Numata, Kouji Yamada, Tsutomu Miyasaka, Tomokazu Umeyama, Hiroshi Imahori, Seigo Ito
Research of CH3NH3PbI3 perovskite solar cells had significant attention as the candidate of new future energy. Due to the toxicity, however, lead (Pb) free photon harvesting layer should be discovered to replace the present CH3NH3PbI3 perovskite. In place of lead, we have tried antimony (Sb) and bismuth (Bi) with organic and metal monovalent cations (CH3NH3(+), Ag(+) and Cu(+)). Therefore, in this work, lead-free photo-absorber layers of (CH3NH3)3Bi2I9, (CH3NH3)3Sb2I9, (CH3NH3)3SbBiI9, Ag3BiI6, Ag3BiI3(SCN)3 and Cu3BiI6 were processed by solution deposition way to be solar cells...
2017: Nano Convergence
Chia-Jui Li, Chuan-Ming Tseng, Sz-Nian Lai, Chin-Ru Yang, Wei-Hsuan Hung
Although TiO2 was formerly a common material for photocatalysis reactions, its wide band gap (3.2 eV) results in absorbing only ultraviolet light, which accounts for merely 4% of total sunlight. Modifying TiO2 has become a focus of photocatalysis reaction research, and combining two metal oxide semiconductors is the most common method in the photocatalytic enhancement process. When MoO3 and TiO2 come into contact to form a heterogeneous interface, the photogenerated holes excited from the valence band of MoO3 should be transferred to the valence band of TiO2 to effectively reduce the charge recombination of photogenerated electron-hole pairs...
October 6, 2017: Nanoscale Research Letters
Rajeshkumar S Hyam, Jihoon Jeon, Songhwa Chae, Yong Tae Park, Sung Jae Kim, Byeongchan Lee, Choongyeop Lee, Dukhyun Choi
In this study, we report the crystallinity effects of submicrometer titanium dioxide (TiO2) nanotube (TNT) incorporated with silver (Ag) nanoparticles (NPs) on surface-enhanced Raman scattering (SERS) sensitivity. Furthermore, we demonstrate the SERS behaviors dependent on the plasmonic-photonic interference coupling (P-PIC) in the TNT-AgNP nanoarchitectures. Amorphous TNTs (A-TNTs) are synthesized through a two-step anodization on titanium (Ti) substrate, and crystalline TNTs (C-TNTs) are then prepared by using thermal annealing process at 500 °C in air...
October 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Eman Jameel Fatani, Hamed H Almutairi, Ali O Alharbi, Yasser Obaidallah Alnakhli, Darshan Devang Divakar, Muzaheed, Abdulaziz Abdullah Alkheraif, Aftab Ahmed Khan
Orthodontic brackets made from stainless steel were introduced in dentistry, though they have less ability in reducing enamel demineralization and are not successful in preventing microbial as well as biofilm growth. In this study, we evaluated the significant role of different brackets in reducing enamel demineralization indirectly. Results from different tests indicate the significant reduction in adhesion, biofilm formation and slow growth of tested bacterial species on brackets coated with Ag + TiO2 and found to be statistically significant lower than control...
September 29, 2017: Microbial Pathogenesis
Wing-Lam Poon, Harri Alenius, Joseph Ndika, Vittorio Fortino, Vesa Kolhinen, Arūnas Meščeriakovas, Mingfu Wang, Dario Greco, Anna Lähde, Jorma Jokiniemi, Jetty Chung-Yung Lee, Hani El-Nezami, Piia Karisola
Nano-sized metal oxides are currently the most manufactured nanomaterials (NMs), and are increasingly used in consumer products. Recent exposure data reveal a genuine potential for adverse health outcomes for a vast array of NMs, however the underlying mechanisms are not fully understood. To elucidate size-related molecular effects, differentiated THP-1 cells were exposed to nano-sized materials (n-TiO2, n-ZnO and n-Ag), or their bulk-sized (b-ZnO and b-TiO2) or ionic (i-Ag) counterparts, and genome-wide gene expression changes were studied at low-toxic concentrations (<15% cytotoxicity)...
September 29, 2017: Nanotoxicology
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