Preparation of water-soluble CdTe/CdS core/shell quantum dots with enhanced photostability

被引：130
|
作者：
Peng, Hui [1 ]
Zhang, Lijuan [1 ]
Soeller, Christian [1 ]
Travas-Sejdic, Jadranka [1 ]
机构：
[1] Univ Auckland, Polymer Elect Res Ctr, Auckland 1, New Zealand
来源：
JOURNAL OF LUMINESCENCE | 2007年 / 127卷 / 02期
关键词：
CdTe/CdS; core/shell structure; quantum dots; aqueous synthesis; photostability;
D O I：
10.1016/j.jlumin.2007.04.007
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
CdTe/CdS core/shell quantum dots (QDs) have been synthesized in an aqueous phase using thioacetamide as a sulfur source. The quantum yield was greatly enhanced by the epitaxial growth of a CdS shell, which was confirmed by X-ray photoelectron spectroscopy (XPS) results. The quantum yield of as-prepared CdTe/CdS core/shell QDs without any post-preparative processing reached 58%. The experimental results illustrate that the QDs with core/shell structure show better photostability than thioglycolic acid (TGA)-capped CdTe QDs. The cyclic voltammograms reveal higher oxidation potentials for CdTe/CdS core/shell QDs than for TGA-capped CdTe QDs, which explains the superior photostability of QDs with a core/shell structure. This enhanced photostability makes these QDs with core/shell structure more suitable for bio-labeling and imaging. (C) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：721 / 726
页数：6
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