文献类型：期刊文献

英文题名：Energy transfer by plasmon-induced local electromagnetic field in Au-based TiO2 plasmonic photocatalysts

作者：Kong, Weihang[1,2];Guan, Zhipeng[1,2];Wang, Shilin[1,2];Zhang, Jinling[1,2];Tian, Baozhu[1,2]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Inst Fine Chem, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2019

卷号：45

期号：10

起止页码：5203

外文期刊名：RESEARCH ON CHEMICAL INTERMEDIATES

收录：;EI(收录号：20192707133246);WOS:【SCI-EXPANDED(收录号:WOS:000486518900028)】；

基金：This work has been supported by the National Natural Science Foundation of China (21573069, U1862112, 21677048, and 21811540394).

语种：英文

外文关键词：Noble metal SPR; Energy transfer mechanism; TiO2; FDTD simulation

摘要：Although Au-based TiO2 plasmonic photocatalysts have received wide research attention as an effective strategy to extend the visible light response of TiO2, the energy transfer mode from plasmon-excited Au to TiO2 is still unclear. Herein, we synthesized Au@SiO2 core-shell structure and further constructed Au@SiO2-P25 (a commercial TiO2) thin film electrode to explore the plasmonic energy transfer mechanism from Au nanoparticles (NPs) to TiO2. The obtained samples were characterized by means of transmission electron microscopy, X-ray diffraction, UV-visible diffuse reflectance spectroscopy, and transient photocurrents. The result of transient photocurrents indicates that the SiO2 interlayer cannot inhibit the generation of electron-hole pairs in TiO2. Combining the finite difference time domain (FDTD) simulations, it was revealed that the photocurrents of Au@SiO2-P25 and Au-P25 are very dependent on the electromagnetic field intensity acting on TiO2. It can be deduced that the electron-hole pairs in TiO2 are excited by the local electromagnetic field induced by surface plasmon resonance (SPR) of Au NPs. Therefore, the energy transfer from Au to TiO2 is realized by the local electromagnetic field. This work provides solid evidence for the local electromagnetic field mechanism in a noble metal-semiconductor plasmonic system.