The synthesis and kinetic growth of anisotropic silver particles loaded on TiO2 surface by photoelectrochemical reduction method
✍ Scribed by Xin He; Xiujian Zhao; Baoshun Liu
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 446 KB
- Volume
- 254
- Category
- Article
- ISSN
- 0169-4332
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✦ Synopsis
Silver nanorods with average diameters of 120-230 nm and aspect ratio of 1.7-5.0 were deposited on the surface of TiO 2 films by photoelectrochemical reduction of Ag + to Ag under UV light. The composite films prepared on soda-lime glass substrates were characterized by Xray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The results show that the TiO 2 film after UV irradiation in AgNO 3 solution is composed of anatase phase TiO 2 and metallic silver with face centered cubic structure. Other compounds cannot be found in the final films. The maximum deposition content of silver particles on the surface of TiO 2 film was obtained with the AgNO 3 concentration of 0.1 M. The kinetic growth rates of silver particles can be controlled by photocatalytic activity of TiO 2 films. The studies suggest that the growth rates of silver particles increase with the enhancement of photocatalytic activity of TiO 2 films. The maximum growth rate of silver particles loaded on TiO 2 films can be up to 0.353 nm min À1 among samples 1#, 2# and 3#, while the corresponding apparent rate constant of TiO 2 is 1.751 Â 10 À3 min À1 .