Ligand-induced chirality in asymmetric CdSe/CdS nanostructures: a close look at chiral tadpoles
HAO, Junjie
Department of Electrical and Electronic Engineering
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
School of Materials Science and Engineering
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Department of Electrical and Electronic Engineering
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
School of Materials Science and Engineering
HAO, Junjie
Department of Electrical and Electronic Engineering
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
School of Materials Science and Engineering
< Réduire
Department of Electrical and Electronic Engineering
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
School of Materials Science and Engineering
Langue
en
Article de revue
Ce document a été publié dans
ACS Nano. 2020, vol. 14, n° 8, p. 10346–10358
American Chemical Society
Résumé en anglais
Ligand-induced chirality in asymmetric CdSe/CdS core–shell nanocrystals (NCs) has been extensively applied in chiral biosensors, regioselective syntheses and assemblies, circularly polarized luminescence (CPL), and ...Lire la suite >
Ligand-induced chirality in asymmetric CdSe/CdS core–shell nanocrystals (NCs) has been extensively applied in chiral biosensors, regioselective syntheses and assemblies, circularly polarized luminescence (CPL), and chiroptic-based devices due to their excellent physiochemical properties, such as the tunable quantum confinement effects, surface functionality, and chemical stability. Herein, we present CdSe/CdS NCs with various morphologies such as nanoflowers, tadpoles, and dot/rods (DRs) with chirality induced by surface chiral ligands. The observed circular dichroism (CD) and CPL activities are closely associated with the geometrical characteristics of the nanostructures, such as the shell thickness and the aspect ratio of the CdSe/CdS NCs. Furthermore, in situ observations of the growth of tadpoles with a single tail indicate that the CD response is mainly attributed to the CdS shell, which has a maximum tail length of ∼45 nm (approximately λ/10 of the incident light wavelength). On the other hand, the CPL activity is only related to the CdSe core, and the activity benefits from a thin CdS shell with a relatively high photoluminescence quantum yield (QY). Further theoretical models demonstrated the aspect-ratio-dependent g-factor and QY variations in these asymmetric nanostructures. These findings provide insights into not only the asymmetric synthesis of CdSe/CdS NCs, but also the rational design of CdSe/CdS nanostructures with tunable CD and CPL activities.< Réduire
Mots clés en anglais
ligand-induced chirality
CdSe/CdS core−shell nanocrystals
circularly polarized luminescence
circular dichroism
nanoflowers
tadpoles
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