Selenium Redox Reactivity on Colloidal CdSe Quantum Dot Surfaces.

Selenium Redox Reactivity on Colloidal CdSe Quantum Dot Surfaces.
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胶体CDSE量子点表面上的硒氧化还原反应性。

DOI:
10.1021/jacs.6b06548
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发表时间:
2016-09-07
影响因子:
15
通讯作者:
Gamelin DR
Gamelin DR
中科院分区:
化学1区
文献类型:
--
作者:
Tsui EY;Hartstein KH;Gamelin DR

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了解半导体纳米晶体中带隙态的结构和组成起源是纳米科学领域的长期挑战。在这里,我们报告了多种可用于胶体 CdSe 量子点的光化学还原的试剂,并且我们确定这些反应在光激发之前通过暗表​​面预还原步骤进行。基于各种还原剂特定性质的机理研究表明,这种表面预还原发生在氧化的表面硒位点。这些结果证明了使用小分子无机化学来控制胶体量子点的物理性质,并提供对其局部表面物种的特性和反应性的微观见解。
Understanding the structural and compositional origins of midgap states in semiconductor nanocrystals 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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