高光活性II-VI型半导体纳米晶的合成及其圆二色光谱解析

Since 2007 chiral semiconductor nanomaterials got a fast development. The nanomaterials have a potential application in the asymmetric catalysis, enantiomeric detection and separation, spin devices. However, the main problem to impede their progress to the actual application is the weak optical activity. According to the Rosenfold function of circular dichroism intensity, there are two ways to increase the optical activity of materials. One is enhancing the electronic transition moment, and the other one is increasing of the magnetic transition moment. According to above two effective factors, this subject makes II-VI semiconductor nanocrystals as the subject, and expects to get the nanocrystals with highly optical activity by controlling the shape and doped with magnetic ions. Further, the circular dichroism spectrum would be analyzed in detail to get the information of the electronic structures of nanocrystals. The results not only broaden the comprehension of optical activity at nanoscale but also provide guidance for developing novel chiroptical devices, which have both important scientific significance and potential application value.

手性半导体纳米材料从2007年发展到现在，在手性催化，手性识别，自旋电子器件等方面具有潜在的应用价值。然而，目前已有的手性半导体纳米材料的光活性比较弱，远远无法满足实际器件的构建和生产的需求。根据光活性强度的Rosenfold公式，提高其光学活性需要从两个方面着手，一个是提高跃迁电偶极矩，另一个是提高跃迁磁偶极矩。本项目选取广泛研究的II-VI型纳米晶为研究对象，通过形貌调控和磁离子掺杂两种途径，分别针对以上的两个关键影响因素进行调节，以期望获得高光学活性的半导体纳米材料。同时，在研究过程中，对半导体纳米晶的圆二色光谱进行进一步解析，期望从圆二色光谱中获取丰富的量子限域下的电子结构信息。预计研究结果将推动手性纳米材料的发展，扩展人们对于纳米尺度光学活性的认知，为手性半导体纳米材料在器件领域的开发提供依据，具有重要的科学意义和潜在的应用价值。

本项目着重围绕“高光活性II-VI型半导体纳米晶的合成及其圆二色光谱解析”开展系统研究。通过调控II-VI型半导体纳米晶的形貌、结构及组分，在如下手性半导体纳米材料的光学活性及磁光活性方面取得进展：1）新型手性半导体纳米晶的构建及光活性机理研究；2）磁圆二色（MCD）在探测半导体纳米晶电子态结构中的应用；3）局域磁诱导半导体纳米晶光学活性。以上研究，对于实现无机纳米材料光学活性的灵活调控，有一定的参考价值。

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