文献类型：期刊文献

中文题名：L-半胱氨酸修饰CdTe与CdTe/CdS量子点的水相合成与表征

英文题名：Aqueous L-cysteine Capped CdTe and CdTe/CdS Core-Shell Quantum Dots: Preparation and Characterization

作者：张梦亚[1];高兵[1];柳翠[1];袁晓[1];杨云霞[1];李红波[1]

机构：[1]华东理工大学,上海200237

年份：2016

卷号：45

期号：S1

起止页码：554

中文期刊名：稀有金属材料与工程

外文期刊名：Rare Metal Materials and Engineering

收录：CSTPCD;;Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000392168800123)】；北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；

基金：上海市科学技术委员会基金(14521103102);国家高技术研究发展计划("863"计划)(2014AA0521012)

语种：中文

中文关键词：L-半胱氨酸;CdTe量子点;CdTe-CdS核壳量子点;光稳定性

外文关键词：L-cysteine;;CdTe;;CdTe/CdS core-shell quantum dots;;photostability

摘要：用L-半胱氨酸作为配体,直接水相合成了CdTe量子点和核壳结构CdTe/CdS量子点;实验研究了不同回流温度和回流时间下对CdTe量子点的光学性质的影响以及改善光稳定性的方法。利用紫外-可见吸收光谱和荧光光谱表征了CdTe和CdTe/CdS量子点的光学性质;CdTe量子点的荧光发射峰在525~565nm之间,且发射峰较窄;XRD、透射电镜(TEM)测试表明合成了物相较纯、分散性较好、尺寸均匀且粒径在2~3nm的CdTe量子点,但存在光稳定性差的缺点。制备核壳结构CdTe/CdS量子点的方法对所合成的CdTe量子点的光稳定性进行改善,通过荧光发射光谱、紫外吸收光谱、透射电镜(TEM)和XRD测试对CdTe/CdS核壳量子点的形貌和性能进行了表征。
An aqueous phase synthesis of CdTe and CdTe/CdS core-shell quantum dots with use of L-cysteine as ligand was reported, and the influence of reflux time and temperature on the optical properties of Cd Te quantum dots was discussed, and capable method of improving the stability under light irradiation was proposed. The optical properties of quantum dots were studied using UV-visible absorption and fluorescence spectrometers. Results show that the prepared CdTe quantum dots have relatively narrow fluorescent emission bands with peaks in a range of 525~565 nm. The XRD and TEM characterizations indicate that the prepared Cd Te quantum dots possess pure phase and good dispersion with average particle size of 2~3 nm, but their photostability is much poor. Comparatively, the photostability can be improved significantly for the Cd Te/Cd S core-shell quantum dots. Comprehensive investigations on the CdTe/CdS core-shell quantum dots were carried out with UV-visible absorption, fluorescence, TEM and XRD characterizations.