期刊
JOURNAL OF LUMINESCENCE
卷 127, 期 2, 页码 721-726出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2007.04.007
关键词
CdTe/CdS; core/shell structure; quantum dots; aqueous synthesis; photostability
类别
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.
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