Abstract
Induced circular dichroism in CdSe and ZnSe nanoplatelets (NPLs) was demonstrated using chiral thermotropic liquid crystals (LCs). Firstly, NPLs were easily dispersed in cholesteryl oleyl carbonate (COC) LC via a simple intercalation chemistry-based approach. Extensive circular dichroism (CD) studies showed remarkably strong and reversible chiroptical properties for these composites as a function of temperature. NPL-COC composites displayed strong exciton-induced CD as well as high anisotropy g-factor values (in the case of CdSe NPLs). Secondly, induced chirality in CdSe NPLs was also demonstrated using right-handed (RH) and left-handed (LH) blue phase LCs. LC-induced chirality in nanoparticles was corroborated by theoretical studies which revealed coupling between the chiral molecular excitons and nonchiral nanocrystals. The temperature-tunability is a useful tool to switch the chirality on/off. This study presents an alternative approach to realize exciton-induced tunable circular dichroism in nanomaterials.
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