期刊
ACS NANO
卷 12, 期 6, 页码 5341-5350出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b00112
关键词
CdSe-dot/CdS-rod; ligand-induced chirality; circular dichorism; circularly polarized luminescence; excitonic interactions; orbital coupling theory
类别
资金
- National Natural Science Foundation of China [11404219, 61674074, 51402148]
- Shenzhen Innovation Project [JCYJ2015032414171163, JCYJ20170302142433007, JCYJ20160301113356947, KC2014JSQN0011A, JCYJ20160301113537474]
- Guangdong Distinguished Young Scholar of Natural Science Foundation [2017B030306010]
- Tianjin New Materials Science and Technology Major Project [16ZXCLGX00040]
Ligand-induced chirality in semiconductor nanocrystals (NCs) has attracted attention because of the tunable optical properties of the NCs. Induced circular dichroism (CD) has been observed in CdX (X = S, Se, Te) NCs and their hybrids, but circularly polarized luminescence (CPL) in these fluorescent nanomaterials has been seldom reported. Herein, we describe the successful preparation of L- and D-cysteine-capped CdSe-dot/CdS-rods (DRs) with tunable CD and CPL behaviors and a maximum anisotropic factor (g(lum)) of 4.66 X 10(-4). The observed CD and CPL activities are sensitive to the relative absorption ratio of the CdS shell to the CdSe core, suggesting that the anisotropic g-factors in both CD and CPL increase to some extent for a smaller shell-to-core absorption ratio. In addition, the molar ratio of chiral cysteine to the DRs is investigated. Instead of enhancing the chiral interactions between the chiral molecules and DRs, an excess of cysteine molecules in aqueous solution inhibits both the CD and CPL activities. Such chiral and emissive NCs provide an ideal platform for the rational design of semiconductor nanomaterials with chiroptical properties.
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