文献类型：期刊文献

英文题名：Single-Nanoparticle Photoelectrochemistry at a Nanoparticulate TiO2-Filmed Ultramicroelectrode

作者：Peng, Yue-Yi[1];Ma, Hui[1];Ma, Wei[1];Long, Yi-Tao[1];Tian, He[1]

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

年份：2018

卷号：57

期号：14

起止页码：3758

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20181104894698);WOS:【SCI-EXPANDED(收录号:WOS:000428350100039)】；

基金：This research was supported by the National Natural Science Foundation of China (21421004, 21775043, 21327807), 973 Program (2014CB748500), the Program of Introducing Talents of Discipline to Universities (B16017), Innovation Program of Shanghai Municipal Education Commission (2017-01-07-00-02-E00023). The authors thank Dr. Jianfu Chen for helpful discussions regarding theoretical simulations.

语种：英文

外文关键词：collision events; photoelectrochemistry; photoinduced electron transfer; single nanoparticles; TiO2 film

摘要：An ultrasensitive photoelectrochemical method for achieving real-time detection of single nanoparticle collision events is presented. Using a micrometer-thick nanoparticulate TiO2-filmed Au ultra-microelectrode (TiO2@Au UME), a sub-millisecond photocurrent transient was observed for an individual N719-tagged TiO2 (N719@TiO2) nanoparticle and is due to the instantaneous collision process. Owing to a trap-limited electron diffusion process as the rate-limiting step, a random three-dimensional diffusion model was developed to simulate electron transport dynamics in TiO2 film. The combination of theoretical simulation and high-resolution photocurrent measurement allow electron-transfer information of a single N719@TiO2 nanoparticle to be quantified at single-molecule accuracy and the electron diffusivity and the electron-collection efficiency of TiO2@Au UME to be estimated. This method provides a test for studies of photoinduced electron transfer at the single-nanoparticle level.