Effects of adsorbed water on plasmon-based dissolution, redeposition and resulting spectral changes of Ag nanoparticles on single-crystalline TiO2

被引:44
作者
Matsubara, Kazuki [1 ]
Kelly, K. Lance [1 ]
Sakai, Nobuyuki [1 ]
Tatsuma, Tetsu [1 ,2 ]
机构
[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan
[2] Japan Sci & Technol Agcy, PRESTO, Kawaguchi, Saitama 3320012, Japan
关键词
D O I
10.1039/b719971f
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Ag nanoparticles photocatalytically deposited on single-crystalline TiO2(111) and (100) surfaces exhibit visible light-induced topographic and spectral changes corresponding to the light wavelength. A certain amount of adsorbed water on the surface is essential for the changes. The photoinduced behaviors strongly depend on the amount of the adsorbed water and on interparticle spacing, indicating that ionic conductivity on the TiO2 surface is a key factor. The results obtained here are rationally explained in terms of a photoelectrochemical mechanism in which photoanodic dissolution of Ag nanoparticles to Ag+ and cathodic re-deposition of Ag play essential roles.
引用
收藏
页码:2263 / 2269
页数:7
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