期刊
APPLIED SURFACE SCIENCE
卷 255, 期 9, 页码 4747-4753出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2008.09.009
关键词
CdTe quantum dots; Water-phase preparation; Thioalkyl acid; Ligand; Capillary electrophoresis
类别
资金
- National Natural Science Foundation of China [20575047]
- SRFDP of MOE, China [20030486011]
In a systematic investigation has been found that ligands play an important role in both the water-phase preparation and optical properties of CdTe quantum dots. Experiments were performed using three typical thioalkyl acids as ligands, namely mercaptoacetic acid (MAA), L-cysteine (Cys) and reduced glutathione (GSH). The growth rate and size-distribution of CdTe quantum dots (QDs) are shown to depend on the type of ligands. A proper choice of ligand enables to make lager nanocrystals with narrower size-distribution. The effects of pH (buffer solution), illumination, heating and cations on the spectroscopic properties of CdTe QDs for the three ligands are reported. In addition, three same-size CdTe QDs were individually characterized by micellar electrokinetic capillary electrophoresis with laser-induced. fluorescent detection, which proved their monodisperse size-distribution and different electric charge distribution on the surface for each of the three different type of QDs. (C) 2009 Published by Elsevier B. V.
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