Synthesis of Aqueous CdTe/CdS/ZnS Core/shell/shell Quantum Dots by a Chemical Aerosol Flow Method

This work described a continuous method to synthesize CdTe/CdS/ZnS core/shell/shell quantum dots. In an integrated system by flawlessly combining the chemical aerosol flow system working at high temperature (200-300°C) to generate CdTe/CdS intermediate products and an additional heat-up setup at rel...

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Bibliographic Details
Published in:Nanoscale research letters 2009-10, Vol.5 (1), p.189-194
Main Authors: Yan, Chuanmiao, Tang, Fangqiong, Li, Linlin, Li, Hongbo, Huang, Xinglu, Chen, Dong, Meng, Xianwei, Ren, Jun
Format: Article
Language:English
Subjects:
Aqueous
CdTe/CdS/ZnS
Chemical aerosol flow
Core-shell
Quantum dot
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Summary:This work described a continuous method to synthesize CdTe/CdS/ZnS core/shell/shell quantum dots. In an integrated system by flawlessly combining the chemical aerosol flow system working at high temperature (200-300°C) to generate CdTe/CdS intermediate products and an additional heat-up setup at relatively low temperature to overcoat the ZnS shells, the CdTe/CdS/ZnS multishell structures were realized. The as-synthesized CdTe/CdS/ZnS core/shell/shell quantum dots are characterized by photoluminescence spectra, X-ray diffraction (XRD), energy-dispersive X-ray spectra (EDS), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Fluorescence and XRD results confirm that the obtained quantum dots have a core/shell/shell structure. It shows the highest quantum yield above 45% when compared to the rhodamine 6G. The core/shell/shell QDs were more stable via the oxidation experiment by H₂O₂.
ISSN:1931-7573
1556-276X
1556-276X
DOI:10.1186/1556-276X-5-189