Papers by Keyword: Ag Nanoparticle

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Authors: Ling Bin Kong, Xiao Wei Wang, Ru Tao Wang, Yong Chun Luo, Long Kang
Abstract: Ag nanoparticles have been fabricated on the surface of CMK-3 mesoporous carbon through an immersion-electrodeposition (IE) technique. Transmission electron microscopy analysis indicated that it was a facile approach to electrochemically prepare nano-sized Ag clusters. Electrochemical experiments showed that Ag nanoproducts were efficient electrocatalysts for anodic oxidation of formaldehyde in alkaline solutions, and as the reduced of the potential value, the electrocatalytic peak current density for the formaldehyde electro-oxidation reaction was increased gradually. Also, the electrocatalytic activity of Ag/CMK-3 nanocatalysts for formaldehyde electro-oxidation is higher than that of Ag/XC-72 nanocatalysts. These findings represented a significant step toward the implementation of individual Ag/CMK-3 nanocatalysts as anodic materials in fuel cells and sensors.
494
Authors: Feng Pan, Jun Ying Zhang, Hai Ying Liu, Tian Min Wang, Wei Chang Hao
Abstract: Ag nano-particles were deposited on the surface of TiO2 self-assembled films by photo-reduction of Ag+ solution. SPM, XPS and UV-Vis spectrophotometer were employed to characterize the microstructure and photo-catalytic performance of the films. An obvious enhancement of photo-catalytic activity had been observed. Since rutile had a lower optical band gap than anatase, a higher photo-catalytic efficiency improvement of rutile than that of anatase was obtained under the help of Ag nano-particles, which acted as electron acceptors.
293
Authors: Huan Di Huang, Hui Juan Zhu, Liang Shu Jiang, Huan Yu Zhao
Abstract: Ag nanoparticle functionalized TiO2 nanowire (TiO2 NW @ Ag NP) was synthesized and the gas sensing properties of the nanowire film was investigated. The size and the distribution density of Ag nanoparticles can be easily controlled. The sensor based on Ag nanoparticle functionalized TiO2 nanowire thin film has promising sensing properties, and at room temperature, its sensitivity towards H2 and O2 can reach 500 ppm and 1000 ppm respectively.
1822
Authors: Li Shuang Liu, Xiu Jian Chou, Tao Chen, Li Ning Sun
Abstract: This paper presents a type of Ag/polydimethylsiloxane (Ag/PDMS) nanocomposite material for use in strain gauge element applications. In these elements, the Ag nanoparticles work as conductive elements by electron tunneling and the PDMS forms the tunneling dielectricstructure. In our experiments, the piezoresistance and piezocapacitance characteristics of these Ag/PDMS composites have been studiedunder applied rain/stress. From the results, the gauge factors for piezoresistance and piezocapacitance can reach up to 153 and 224, respectively. Also, when acting as strain elements, the Ag/PDMS composites show fine levels of repeatability and stability. The results given here prove that the material can be used to form anew type of high-sensitivity element for sensor applications. The detectionmethod used for the sensor signals also offersdiversity by including both piezoresistance and piezocapacitance.
57
Authors: Chen Yang Hu, Xiao Bo Zhang, Xiao Yun Li, Hui Chen
Abstract: A solution method was developed to synthesized heteronanostructure of Ag nanoparticles on titanate nanowires, and then flexible photocatalytic Films were made by these nanowires. The nanowire is about 50 nm in diameter, several hundreds micrometers in length. The size of the Ag nanoparticle grafted on the nanowire is about 50 to 100 nm. The nanowire Film showed excellent photocatalytic activity to decompose the methamidophos and satisfactory antibacterial effect to kill Escherichia coli.
4215
Authors: Xiu Yan Li, Jun Shen, Ai Du, Zhi Hua Zhang, Hui Yu Yang
Abstract: A simple and clean route to synthesize nano-scale mesoporous silver-silica composite aerogels was described here. The composite aerogels were obtained by adding a silver colloid to an about-to-gel silica sol prepared and then dried in supercritical anhydrous ethyl alcohol. The silver colloid and composite aerogels with silver content of 0wt%, 0.5wt%, 1wt% and 3.5wt% were characterized by UV-visible absorption spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectrometer (EDS), X-ray diffractometer (XRD) and N2 Brunauer-Emmett-Teller (BET). The results show that silver nanoparticles with size about 40nm are successfully impregnated into the spongy porous structure of silica. The surface area decreases from 845 to 443m2/g with the increase of silver content. And the nanoscopic surface and bulk properties of each component are retained in the solid composite.
220
Authors: Junki Komori, Tsuyoshi Sueto, Kensuke Nishioka
Abstract: Reflection losses of light at the silicon surface cause a reduction in conversion efficiency of silicon solar cell. There is anisotropic etching silicon to form a textured structure on the silicon surface by a simple wet process as a method of reducing the reflectivity. Further, miniaturization of the textured structure to the nanosize will improve the conversion efficiency by reducing the reflectivity. In this study, we formed texture structure of 1 μm size by applying the particles on a silicon surface as an etching mask.
174
Authors: Ahmad Al Mohammad, Mohamad B. Alsous
Abstract: The effect of surface structures of annealed WO3 thin films on heteroepitaxial growth of molecular beam epitaxy (MBE) deposited silver nanoparticles (Ag NPs) has been investigated. Hexagonal WO3 (h-WO3) and monoclinic WO3 (m-WO3) thin films were used in (1x1) stoichiometric forms. The structure, the density, the particle size and the morphology of Ag NPs on WO3 films were determined by transmission electron microscope (TEM) and selected area electron diffraction (SAEC). Ag NPs on the m-WO3 surface created the (111)Ag//(001)m-WO3 interface without preferred orientations while the epitaxial relationships between Ag NPs and the h-WO3 films were formed as (111)Ag//(0001)h-WO3 and Ag[01-1]//[21-30]h-WO3. It was observed that the particle density, the mean size and the size dispersion of Ag NPs were controlled by either atom diffusion or by particle migration on the substrates. The maximum cluster density method and the Lifethenz theory of Van der Waals energy were used to investigate the Ag NP morphology and Ag//WO3 interface parameters at saturation particle density of NPs.
137
Authors: S. Mohammadnejad, A. Bazmara, M.H. Hajigholam
Abstract: In this article Tio2 thin film Containing dispersed Ag metal particle was prepared by the sol gel method, and the effect of the metal particles on the optical properties such as responsivity, extinction coefficient, plasmonic resonance of the thin films were investigated. UV/Vis optical spectra and Scanning electron microscopy were recorded to characterize the Ag/Tio2 composite films.
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