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

作者：Zhang Mengya; Gao Bing; Liu Cui; Yuan Xiao; Yang Yunxia; Li Hongbo^*

来源：Rare Metal Materials and Engineering, 2016, 45: 554-559.

• L-cysteine
• CdTe
• CdTe/CdS core-shell quantum dots
• photostability

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 CdTe 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 CdTe quantum dots possess pure phase and good dispersion with average particle size of 2 similar to 3 nm, but their photostability is much poor. Comparatively, the photostability can be improved significantly for the CdTe/CdS 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.

• 出版日期2016-6
• 单位华东理工大学