Surface-Plasmon-Induced Visible Light Photocatalytic Activity of TiO2 Nanospheres Decorated by Au Nanoparticles with Controlled Configuration
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- 作者：Saji Thomas Kochuveedu ; Dong-Pyo Kim ; Dong Ha Kim
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：January 26, 2012
- 年：2012
- 卷：116
- 期：3
- 页码：2500-2506
- 全文大小：1016K
- 年卷期：v.116,no.3(January 26, 2012)
- ISSN：1932-7455
文摘
This work is focused on the development of a surface plasmon-induced visible light active photocatalyst system composed of silica鈥搕itania core鈥搒hell (SiO2@TiO2) nanostructures decorated with Au nanoparticles (Au NPs). The influence of size and distribution of Au NPs on photocatalysis, its fabrication methods, and exploration of the mechanism of visible light activity were investigated. A favorable architecture of SiO2 beads with a thin layer of TiO2 was decorated with Au NP arrays having different size and areal density. Surface modification of SiO2@TiO2 leads to a viable and homogeneous loading of Au NPs on the surface of TiO2, which renders visible light-induced photocatalytic activity on the whole TiO2 surface. An optimized system employing Au NP arrays with 15 nm size and 700/渭m2 density showed best catalytic efficiency due to a synergistic effect of the firm contact between Au NPs and TiO2 and efficiently coupled SPR excitation. A brief mechanism relating the electron transfer from surface-plasmon-stimulated Au NPs to the conduction band of TiO2 is proposed.