期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 35, 页码 11105-11108出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b06548
关键词
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资金
- NSF [CHE-1506014, DGE-1256082]
- NIH [F32GM110876]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1506014] Funding Source: National Science Foundation
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.
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