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Surface-plasmon-induced visible light photocatalytic activity of TiO 2 nanospheres decorated by au nanoparticles with controlled configuration

Title
Surface-plasmon-induced visible light photocatalytic activity of TiO 2 nanospheres decorated by au nanoparticles with controlled configuration
Authors
Kochuveedu S.T.Kim D.-P.Kim D.H.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2012
Journal Title
Journal of Physical Chemistry C
ISSN
1932-7447JCR Link
Citation
vol. 116, no. 3, pp. 2500 - 2506
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
This work is focused on the development of a surface plasmon-induced visible light active photocatalyst system composed of silica-titania core-shell (SiO 2@TiO 2) 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 SiO 2 beads with a thin layer of TiO 2 was decorated with Au NP arrays having different size and areal density. Surface modification of SiO 2@TiO 2 leads to a viable and homogeneous loading of Au NPs on the surface of TiO 2, which renders visible light-induced photocatalytic activity on the whole TiO 2 surface. An optimized system employing Au NP arrays with 15 nm size and 700/μm 2 density showed best catalytic efficiency due to a synergistic effect of the firm contact between Au NPs and TiO 2 and efficiently coupled SPR excitation. A brief mechanism relating the electron transfer from surface-plasmon-stimulated Au NPs to the conduction band of TiO 2 is proposed. © 2011 American Chemical Society.
DOI
10.1021/jp209520m
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자연과학대학 > 화학·나노과학전공 > Journal papers
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