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Ag TiO2

Xiaolei Zhang, Huimin Sui, Xiaolei Wang, Hongyang Su, Weina Cheng, Xu Wang, Bing Zhao
A nanoscale metal-molecule-semiconductor assembly (Ag/4-mercaptophenol/TiO2) has been fabricated over Au nanoparticle (NP) films as a model to study the interfacial charge transfer (CT) effects involved in Ag/MPH/TiO2. Due to the interaction between Au NPs and Ag NPs, some distinct differences occur in the SERS spectra. We also measured the SERS of Ag/MPH (4-mercaptophenol), Ag/MPH/TiO2, and Au/Ag/MPH/TiO2 assemblies at excitation wavelengths of 477, 514, 532, 633, and 785 nm. We found that the changes in the CT process, caused by the introduction of TiO2 and Au, can be reflected in SERS...
October 24, 2016: Physical Chemistry Chemical Physics: PCCP
Xiang Gao, Shaolong Wu, Jimu Yan, Xiongfei Zhai, Xiaofeng Li
Semiconductor nanostructure photoelectrochemical (PEC) cells for sunlight conversion have the potential to supply continuous, low-cost, high-efficiency and carbon-free energy; however, in order to provide economically competitive energy, long-time stability and high-efficiency are requisite. In this work, the saturation photocurrent density (Jsat) and stability of the silicon nanowires (SiNWs) in a PEC cell are significantly improved via surface modification with Ag@SiO2 nanoparticles and conformal TiO2 ultrathin film...
October 21, 2016: ACS Applied Materials & Interfaces
Lu Yang, Fangyun Ye, Peng Liu, Fazhou Wang
Visible light driven Ag/AgBr/TiO2 /activated carbon (AC) composite was prepared by sol-gel method coupled with photo-reduction method. For comparison, TiO2 , TiO2 /AC and Ag/AgBr/TiO2 were also synthesized. Their characteristics were analyzed by XRD, SEM-EDS, TG-DSC and UV-Vis techniques. Photocatalytic activity and antibacterial performance under visible light irradiation were investigated by ICP-AES, ATR-FT-IR and spectrophotometry methods using methylene blue and Escherichia coli as target systems, respectively...
October 20, 2016: Photochemistry and Photobiology
Gao-Chao Fan, Xiao-Mei Shi, Jianrong Zhang, Jun-Jie Zhu
Generally, photoanode-based photoelectrochemical immunoassay possesses obvious photocurrent response and lower detection limit for ideal sample detection, but it has the inherent imperfection of poor anti-interference capability for real sample detection. Photocathode-based immunoassay can well avoid the intrinsic drawback of photoanode-based immunoassay, but it has low photocurrent response resulting in less good sensitivity. Herein, a promising new cathode photoelectrochemical immunosensing platform integrating photocathode with photoanode was reported for accurate and sensitive detection of biomarkers...
October 17, 2016: Analytical Chemistry
Chung-Hsuan Wu, Wei-Han Wang, Chien-Chong Hong, Kuo Chu Hwang
This paper presents a novel disposable breath-sensing tube with an on-tube single-nanowire (NW) sensor array for noninvasive, simple, and on-site detection of exhaled breath biomarkers. Although various noninvasive detection methods for lung cancer biomarkers in breath samples exist, they are unsuitable for self-diagnostics and immediate detection because they entail complicated handling procedures and are time intensive. In this study, we simulated, fabricated, and characterized disposable nanosensors by using single TiO2 and Ag NWs in flexible plastic tubes...
October 14, 2016: Lab on a Chip
Paula Ribao, Maria J Rivero, Inmaculada Ortiz
Noble metals have been used to improve the photocatalytic activity of TiO2. Noble metal nanoparticles prevent charge recombination, facilitating electron transport due to the equilibration of the Fermi levels. Furthermore, noble metal nanoparticles show an absorption band in the visible region due to a high localized surface plasmon resonance (LSPR) effect, which contributes to additional electron movements. Moreover, systems based on graphene, titanium dioxide, and noble metals have been used, considering that graphene sheets can carry charges, thereby reducing electron-hole recombination, and can be used as substrates of atomic thickness...
October 11, 2016: Environmental Science and Pollution Research International
Sanghyuk Cheong, Jai-Kyeong Kim, Jinhan Cho
There is rising demand for metal or metal oxide nanoparticle (NP)/polymer nanocomposite films with desired functionalities. However, it is difficult to directly combine well-defined NPs synthesized using organic fatty acids in nonpolar media with water-soluble polymers, except polyelectrolytes with specific functional moieties, because they differ in their hydrophobic/hydrophilic properties. We have developed a facile and universal hydrophilic/hydrophobic layer-by-layer (LbL) assembly method that enables perfect nanoblending between water-soluble polymers and hydrophobic NPs, maintaining their specific functionalities...
September 21, 2016: Nanoscale
Yingcui Fang, Bing Zhang, Liu Hong, Kang Zhang, Gongpu Li, Jun Jiang, Rong Yan, Junling Chen
Plasmonic metal Ag nanoparticles (AgNPs) on TiO2 thin films (AgNPs/TiO2) are a kind of excellent photocatalyst of high efficiency under visible light, and thus draw great interest nowadays. Further improvement of their photocatalytic activity (PA) is difficult but is of high importance for their applications. In this paper, oxygen plasma was taken to partially oxidize AgNPs deposited on the surface of TiO2 to form a structure with the configuration of a p-type semiconductor/plasmonic metal/n-type semiconductor (Ag2O/AgNPs/TiO2)...
September 29, 2016: Nanoscale
Zhaojun Jia, Peng Xiu, Pan Xiong, Wenhao Zhou, Yan Cheng, Shicheng Wei, Yufeng Zheng, Tingfei Xi, Hong Cai, Zhongjun Liu, Cai-Mei Wang, Wei-Ping Zhang, Zhi-Jiang Li
Restoring large-scale bone defects, where osteogenesis is slow while infections lurk, with biomaterials represents a formidable challenge in orthopedic clinics. Here, we propose a scaffold-based multipurpose anti-infection and bone repairing strategy to meet such restorative needs. To do this, personalized multifunctional titanium meshes were produced through an advanced additive manufacturing process and dual "TiO2‒poly(dopamine)/Ag (nano)" post modifications, yielding macroporous constructs with micro/nanoporous walls and nanosilver bullets immobilized/embedded therein...
October 5, 2016: ACS Applied Materials & Interfaces
Yilin Du, Houfeng Xiong, Shuangshi Dong, Jun Zhang, Dongmei Ma, Dandan Zhou
The inactivation mechanism of photocatalytic disinfectants on bacteria is well known. In contrast, the potential inactivation of fungal spores by visible-light induced photocatalysis has been recognized, but the inactivation mechanism is poorly understood. We hypothesize that photocatalytically generated reactive oxygen species (ROSs) are directly involved in this mechanism. To test this hypothesis, we identified the roles of ROSs in the inactivation of Fusarium solani spores. As the photocatalysts, we doped TiO2 with 3 typical dopants, forming Ag/TiO2, N/TiO2 and Er(3+):YAlO3/TiO2...
December 2016: AMB Express
Nikhil Tyagi, Sanjeev K Srivastava, Sumit Arora, Yousef Omar, Zohaib Mohammad Ijaz, Ahmed Al-Ghadhban, Sachin K Deshmukh, James E Carter, Ajay P Singh, Seema Singh
Sunscreen formulations containing UVB filters, such as Zinc-oxide (ZnO) and titanium-dioxide (TiO2) nanoparticles (NPs) have been developed to limit the exposure of human skin to UV-radiations. Unfortunately, these UVB protective agents have failed in controlling the skin cancer incidence. We recently demonstrated that silver nanoparticles (Ag-NPs) could serve as novel protective agents against UVB-radiations. Here our goal was to perform comparative analysis of direct and indirect UVB-protection efficacy of ZnO-, TiO2- and Ag-NPs...
September 28, 2016: Cancer Letters
I-Chieh Chen, I-Lun Hsiao, Ho-Chen Lin, Chien-Hou Wu, Chun-Yu Chuang, Yuh-Jeen Huang
An in vitro blood-brain barrier (BBB) model being composed of co-culture with endothelial (bEnd.3) and astrocyte-like (ALT) cells was established to evaluate the toxicity and permeability of Ag nanoparticles (AgNPs; 8nm) and TiO2 nanoparticles (TiO2NPs; 6nm and 35nm) in normal and inflammatory central nervous system. Lipopolysaccharide (LPS) was pre-treated to simulate the inflammatory responses. Both AgNPs and Ag ions can decrease transendothelial electrical resistance (TEER) value, and cause discontinuous tight junction proteins (claudin-5 and zonula occludens-1) of BBB...
September 15, 2016: Environmental Toxicology and Pharmacology
Chun-Ren Ke, Jyun-Sheng Guo, Yen-Hsun Su, Jyh-Ming Ting
In this work, a novel configuration of the photoelectrochemical hydrogen production device is demonstrated. It is based on TiO2 beads as the primary photoanode material with the addition of a heterostructure of silver nanoparticles/graphene. The heterostructure not only caters to a great improvement in light harvesting efficiency (LHE) but also enhances the charge collection efficiency. For LHE, the optimized cell based on TiO2 beads/Ag/graphene shows a 47% gain as compared to the cell having a photoanode of commercial P25 TiO2 powders...
October 28, 2016: Nanotechnology
Haifeng Zhao, Fei Huang, Juan Hou, Zhiyong Liu, Qiang Wu, Haibin Cao, Qun Jing, Shanglong Peng, Guozhong Cao
A high efficiency quantum dot sensitized solar cell (QDSC) based on Ag nanoparticles (NPs) decorated TiO2/ZnO nanorod arrays (NAs) photoelectrode has been constructed. The incorporation of Ag NPs to TiO2/ZnO NAs photoelectrode not only increases light harvesting efficiency and facilitates exciton dissociation but also decreases surface charge recombination and prolongs electron lifetime, which collectively contribute to improving the Jsc of the CdS/CdSe QDs cosensitized solar cells. The direct contact of Ag NPs with TiO2 NPs is undergoing Fermi level alignment; thus, the apparent Fermi level is supposed to trigger an upward shift of more negative potential, which results in an increase the Voc of the QDSCs...
October 12, 2016: ACS Applied Materials & Interfaces
Carolyn M Wilke, Tiezheng Tong, Jean-François Gaillard, Kimberly A Gray
Engineered nanomaterials (ENMs) are incorporated into thousands of commercial products, and their release into environmental systems creates complex mixtures with unknown toxicological outcomes. To explore this scenario, we probe the chemical and toxicological interactions of nanosilver (n-Ag) and nanotitania (n-TiO2) in Lake Michigan water, a natural aqueous medium, under dark conditions. We find that the presence of n-Ag induces a stress response in Escherichia coli, as indicated by a decrease in ATP production observed at low concentrations (in the μg L(-1) range), with levels that are environmentally relevant...
October 4, 2016: Environmental Science & Technology
Majid Mirzaee, Mohammadreza Vaezi, Yahya Palizdar
Silver-doped hydroxyapatite (Ca10-xAgx(PO4)6(OH)2-x) films were synthesized and deposited on anodized titanium (Ti) using electrophoretic. The influence of different silver-dopant contents (X=0, 0.02, 0.05, 0.08 and 0.1) on the phase formation and microstructure of the powders were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscope (XPS), and Fourier transform infrared spectrum analysis (FT-IR). XRD analysis confirmed the formation of Hexagonal structure of hydroxyapatite (HAp) annealed at 600°C with a small shift in the major peak position toward lower angles with adding silver...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
Maria Harmati, Zsofia Tarnai, Gabor Decsi, Sandor Kormondi, Zsolt Szegletes, Laszlo Janovak, Imre Dekany, Okay Saydam, Edina Gyukity-Sebestyen, Gabriella Dobra, Istvan Nagy, Katalin Nagy, Krisztina Buzas
BACKGROUND: Head and neck cancers comprise the sixth most common cancer type worldwide. One of the most remarkable malignancies of the head and neck is the cancer of the nasopharynx, with a strong metastatic tendency already in the early stage. Besides the conventional pathways of metastasis formation, the information content of exosomes produced by the cancer cells may play a key role in metastatic transformation. The aim of this study was to investigate how stressors alter the characteristic of tumor derived exosomes...
September 6, 2016: Journal of Oral Pathology & Medicine
Kerstin Hund-Rinke, Anders Baun, Denisa Cupi, Teresa F Fernandes, Richard Handy, John H Kinross, José M Navas, Willie Peijnenburg, Karsten Schlich, Benjamin J Shaw, Janeck J Scott-Fordsmand
Regulatory ecotoxicity testing of chemicals is of societal importance and a large effort is undertaken at the OECD to ensure that OECD test guidelines (TGs) for nanomaterials (NMs) are available. Significant progress to support the adaptation of selected TGs to NMs was achieved in the context of the project MARINA ( ) funded within the 7th European Framework Program. Eight OECD TGs were adapted based on the testing of at least one ion-releasing NM (Ag) and two inert NMs (TiO2). With the materials applied, two main variants of NMs (ion releasing vs...
September 20, 2016: Nanotoxicology
Pengtao Sheng, Weili Li, Pengwei Du, Kesheng Cao, Qingyun Cai
Vertically aligned single crystalline CuO nanowire arrays (NWs) grown directly on TiO2 nanotube arrays (NTAs) supporting by Ti foil have been successfully fabricated using facile thermal oxidation of Cu nanocrystals in static air. CuO NWs growth behavior dependent on parent Cu nanocrystals sizes has been well investigated. Mass transport channel of Cu ions in horizontal and vertical for supporting CuO NWs diameter and length changes has been confirmed through a novel step-by-step surface diffusion process. CuO NWs, nano-mushrooms and nanosheets can be easily obtained by varying growth conditions...
November 1, 2016: Talanta
Guomin Wang, Hongqing Feng, Ang Gao, Qi Hao, Weihong Jin, Xiang Peng, Wan Li, Guosong Wu, Paul K Chu
Titania loaded with noble metal nanoparticles exhibits enhanced photocatalytic killing of bacteria under light illumination due to the localized surface plasmon resonance (LSPR) property. It has been shown recently that loading with Au or Ag can also endow TiO2 with the antibacterial ability in the absence of light. In this work, the antibacterial mechanism of Au-loaded TiO2 nanotubes (Au@TiO2-NT) in the dark environment is studied, and a novel type of extracellular electron transfer (EET) between the bacteria and the surface of the materials is observed to cause bacteria death...
September 21, 2016: ACS Applied Materials & Interfaces
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