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- Title
Single‐Nanoparticle Photoelectrochemistry at a Nanoparticulate TiO<sub>2</sub>‐Filmed Ultramicroelectrode.
- Authors
Peng, Yue‐Yi; Ma, Hui; Ma, Wei; Long, Yi‐Tao; Tian, He
- Abstract
Abstract: 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.
- Subjects
PHOTOELECTROCHEMISTRY; METAL nanoparticles; COLLISIONS (Physics); TITANIUM oxides; ULTRAMICROELECTRODES; ELECTRON diffusion
- Publication
Angewandte Chemie, 2018, Vol 130, Issue 14, p3820
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201710568