Shell distribution on colloidal CdSe/ZnS quantum dots

被引：64
|
作者：
Yu, ZH
Guo, L
Du, H
Krauss, T
Silcox, J [1 ]
机构：
[1] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA
[2] Cornell Univ, Dept Phys, Ithaca, NY 14853 USA
[3] Univ Rochester, Dept Chem, Rochester, NY 14627 USA
来源：
NANO LETTERS | 2005年 / 5卷 / 04期
关键词：
D O I：
10.1021/nl048245n
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
Scanning transmission electron microscopy (STEM) coupled with electron energy loss spectroscopy (EELS) was used to determine the chemical distribution of semiconductor shell material around colloidal core-shell CdSe/ZnS quantum dots (QDs). EELS signals from positions around the OD indicate a well-defined shell of ZnS surrounding the CdSe core, but the distribution of the shell material is highly anisotropic. This nonuniformity may reflect the differences in chemical activity of the crystal faces of the core QD and implies a nonoptimal QD surface passivation.
引用
收藏
页码：565 / 570
页数：6
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