Selenium Redox Reactivity on Colloidal CdSe Quantum Dot Surfaces

被引：50

作者：

Tsui, Emily Y. ^{[1
]}

Hartstein, Kimberly H. ^{[1
]}

Gamelin, Daniel R. ^{[1
]}

机构：

[1] Univ Washington, Dept Chem, Seattle, WA 98195 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2016年 / 138卷 / 35期

基金：

美国国家科学基金会;

关键词：

PBSE NANOCRYSTAL SOLIDS; SEMICONDUCTOR NANOCRYSTALS; ZNO NANOCRYSTALS; ELECTRON; PHOTOCATALYSIS; FILMS; SIZE; NANOPARTICLES; CONFINEMENT; DEPENDENCE;

D O I：

10.1021/jacs.6b06548

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Understanding the structural and compositional origins of midgap states in semiconductor nano crystals is a longstanding challenge in nanoscience. Here, we report a broad variety of reagents useful for photochemical reduction of colloidal CdSe quantum dots, and we establish that these reactions proceed via a dark surface prereduction step prior to photoexcitation. Mechanistic studies relying on the specific properties of various reductants lead to the proposal that this surface prereduction occurs at oxidized surface selenium sites. These results demonstrate the use of small-molecule inorganic chemistries to control the physical properties of colloidal QDs and provide microscopic insights into the identities and reactivities of their localized surface species.

引用

收藏

页码：11105 / 11108

页数：4

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