1. Ligand-induced chirality in asymmetric CdSe/CdS nanostructures: a close look at chiral tadpoles
- Author
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Haochen Liu, Marie-Hélène Delville, Tingchao He, Junjie Hao, Jiagen Li, Yiwen Li, Kai Wang, Xi Zhu, Jun Miao, Rulin Liu, Qiushi Wang, Jiaji Cheng, Huan Liu, Department of Electrical and Electronic Engineering, Southern University of Science and Technology of China (SUSTech), Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), School of Materials Science and Engineering, Hubei University, Department of Chemistry, Purdue University [West Lafayette], Institut für Energie- und Klimaforschung - Photovoltaik (IEK-5), Forschungszentrum Jülich GmbH | Centre de recherche de Juliers, Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association, Shenzhen Institute of Artificial Intelligence and Robotics for Society (AIRS), College of Physics and Optoelectronic Engineering, Shenzhen University, and The work was supported by National Natural Science Foundation of China (No. 61875082), National Key Research and Development Program (Nos. 2017YFE0120400 and 2016YFB0401702), Natural Science Foundation of Guangdong Province (2019A1515012094), Shenzhen Basic Research Project of Science and Technology (JCYJ20190808121211510). Funding from Shenzhen Institute of Artificial Intelligence and Robotics for Society (AIRS) is appreciated. TEM data were obtained using equipment maintained by Southern University of Science and Technology Core Research Facilities, and the authors would like to acknowledge the technical support from Dongsheng He and Yang Qiu in SUSTech CRF.
- Subjects
Circular dichroism ,Materials science ,Photoluminescence ,General Physics and Astronomy ,Quantum yield ,02 engineering and technology ,Sulfides ,Ligands ,010402 general chemistry ,01 natural sciences ,Cadmium Compounds ,Animals ,CdSe/CdS core−shell nanocrystals ,General Materials Science ,Selenium Compounds ,General Engineering ,Enantioselective synthesis ,nanoflowers ,circularly polarized luminescence ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,ligand-induced chirality ,Nanostructures ,0104 chemical sciences ,circular dichroism ,Crystallography ,Nanocrystal ,Quantum dot ,Larva ,tadpoles ,0210 nano-technology ,Luminescence ,Chirality (chemistry) - Abstract
International audience; 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.
- Published
- 2020
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