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Probing the Interaction of Quantum Dots with Chiral Capping Molecules Using Circular Dichroism Spectroscopy
Nano Letters ( IF 9.6 ) Pub Date : 2016-11-30 00:00:00 , DOI: 10.1021/acs.nanolett.6b03143 Assaf Ben-Moshe 1 , Ayelet Teitelboim 2 , Dan Oron 2 , Gil Markovich 1
Nano Letters ( IF 9.6 ) Pub Date : 2016-11-30 00:00:00 , DOI: 10.1021/acs.nanolett.6b03143 Assaf Ben-Moshe 1 , Ayelet Teitelboim 2 , Dan Oron 2 , Gil Markovich 1
Affiliation
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Circular dichroism (CD) induced at exciton transitions by chiral ligands attached to single component and core/shell colloidal quantum dots (QDs) was used to study the interactions between QDs and their capping ligands. Analysis of the CD line shapes of CdSe and CdS QDs capped with l-cysteine reveals that all of the features in the complex spectra can be assigned to the different excitonic transitions. It is shown that each transition is accompanied by a derivative line shape in the CD response, indicating that the chiral ligand can split the exciton level into two new sublevels, with opposite angular momentum, even in the absence of an external magnetic field. The role of electrons and holes in this effect could be separated by experiments on various types of core/shell QDs, and it was concluded that the induced CD is likely related to interactions of the highest occupied molecular orbitals of the ligands with the holes. Hence, CD was useful for the analysis of hole level–ligand interactions in quantum semiconductor heterostructures, with promising outlook toward better general understanding the properties of the surface of such systems.
中文翻译：
用圆二色性光谱探测量子点与手性封端分子的相互作用
通过附着在单组分和核/壳胶体量子点（QD）上的手性配体在激子跃迁上诱导的圆二色性（CD）用于研究QD与它们的封端配体之间的相互作用。用l封端的CdSe和CdS QD的CD线形分析-半胱氨酸表明，复杂光谱中的所有特征都可以分配给不同的激子跃迁。结果表明，每个跃迁都伴随着CD响应中的导数线形状，表明即使在没有外部磁场的情况下，手性配体也可以将激子能级分裂为两个新的亚能级，具有相反的角动量。电子和空穴在这种效应中的作用可以通过对各种类型的核/壳量子点进行实验来分离，并且得出的结论是，诱导的CD可能与配体的最高占据分子轨道与空穴的相互作用有关。因此，CD可用于分析量子半导体异质结构中的空穴能级-配体相互作用，
更新日期：2016-11-30
中文翻译：
用圆二色性光谱探测量子点与手性封端分子的相互作用
通过附着在单组分和核/壳胶体量子点（QD）上的手性配体在激子跃迁上诱导的圆二色性（CD）用于研究QD与它们的封端配体之间的相互作用。用l封端的CdSe和CdS QD的CD线形分析-半胱氨酸表明，复杂光谱中的所有特征都可以分配给不同的激子跃迁。结果表明，每个跃迁都伴随着CD响应中的导数线形状，表明即使在没有外部磁场的情况下，手性配体也可以将激子能级分裂为两个新的亚能级，具有相反的角动量。电子和空穴在这种效应中的作用可以通过对各种类型的核/壳量子点进行实验来分离，并且得出的结论是，诱导的CD可能与配体的最高占据分子轨道与空穴的相互作用有关。因此，CD可用于分析量子半导体异质结构中的空穴能级-配体相互作用，
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