文献类型：期刊文献

英文题名：Enhanced visible light photocatalytic activity of interlayer-isolated triplex Ag@SiO2@TiO2 core-shell nanoparticles

作者：Zhang, Xiaoqing[1];Zhu, Yihua[1];Yang, Xiaoling[1];Wang, Siwen[1];Shen, Jianhua[1];Lin, Babao[1];Li, Chunzhong[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat, Shanghai 200237, Peoples R China

年份：2013

卷号：5

期号：8

起止页码：3359

外文期刊名：NANOSCALE

收录：;EI(收录号：20133216574755);WOS:【SCI-EXPANDED(收录号:WOS:000316959500034)】；

基金：This work was supported by the National Natural Science Foundation of China (21236003, 21206042, 20925621, 20976054, and 21176083), the Fundamental Research Funds for the Central Universities, and the Program for Changjiang Scholars and Innovative Research Team in University (IRT0825).

语种：英文

外文关键词：Shells (structures) - Photocatalysts - Energy transfer - Plasmonics - Titanium dioxide - Photocatalysis - Sol-gel process - Core shell nanoparticles - Light

摘要：Herein, we demonstrate the design and fabrication of a well dispersed triplex Ag@SiO2@TiO2 core-shell photocatalyst, which shows enhanced visible light photocatalytic activity due to the plasmonic field of the inner Ag core. The SiO2 interlayer is coated on the Ag core by a sol-gel process to prevent oxidation of Ag and adjusting the plasmonic field. The Ag@SiO2@TiO2 nanoparticles with systematic variation of the SiO2 interlayer thickness of 2, 4, 8, 20 nm and TiO2 shell thickness of 2, 10, 20, 40 nm are prepared. The enhancement of the photocatalytic efficiency increases with decreased SiO2 thickness. Nanoparticles with a 2 nm SiO2 interlayer and a 20 nm TiO2 shell exhibited the best photocatalytic performance, ca. 31 times larger in photocatalytic activity and ca. 38 times larger in photocurrent density than P25 under visible light. A brief mechanism relating the plasmon resonance energy transfer from Ag to TiO2 and scattering is proposed. Such an intriguing photocatalyst may find significant applications in various fields.