Preparation and Characterization of Water-Soluble CdSe/CdS Core/Shell Quantum Dots

被引：0

作者：

Li, Mingli ^{[1
]}

Yu, Qiong ^{[1
]}

Xu, Ying ^{[1
]}

Zhou, Chunjiang ^{[1
]}

Lu, Qingguo ^{[1
]}

机构：

[1] China Acad Ordnance Sci, Ningbo Branch, Ningbo 315103, Zhejiang, Peoples R China

来源：

CHEMICAL ENGINEERING AND MATERIAL PROPERTIES II | 2012年 / 549卷

关键词：

Quantum dots; Photoluminescence; Cadmium Selenide/Cadmium Sulfide; Core/Shell; NANOCRYSTALS; NANOPARTICLES;

D O I：

10.4028/www.scientific.net/AMR.549.212

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Cadmium Selenide/Cadmium Sulfide (CdSe/CdS) core/shell quantum dots (QDs) in aqueous solution were prepared by solve-separate method using CdSe as core and mercapto-acetate acid as stabilizer and surfactants. The results of experiments indicate that the size of the CdSe/CdS QDs was about 5nm estimated by FE-TEM, which is accordant with that calculated from the XRD data by the Scherer equation after emendation. The QDs belong to the cubic structure (zinc blende) by XRD analysis. The intensity of luminescence of the quantum dots was greatly improved after the surface was coated with CdS shell. With increasing the time of refluence, the intensity of photoluminescence was promoted correspondingly. The excitation wavelength was 350nm, two emission peaks were clearly observed, the first high-energy peak was at 600nm and the second one located in 700nm. The first high-energy band was attributed to electron hole recombination after relaxation and the second energy band was to deep traps in quantum-confined systems.

引用

页码：212 / 215

页数：4

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