Synthesis and surface modification of PbSe/PbS core-shell nanocrystals for potential device applications

被引：37

作者：

Xu, Jian ^{[1
]}

Cui, Dehu

Zhu, Ting

Paradee, Gary

Liang, Ziqi

Wang, Qing

Xu, Shengyong

Wang, Andrew Y.

机构：

[1] Penn State Univ, Dept Engn Sci, University Pk, PA 16802 USA

[2] Penn State Univ, Dept Mat Sci & Engn, State Coll, PA 16802 USA

[3] Penn State Univ, Dept Phys, State Coll, PA 16802 USA

[4] Ocean Nanotech LLC, Fayetteville, AR 72701 USA

来源：

NANOTECHNOLOGY | 2006年 / 17卷 / 21期

关键词：

D O I：

10.1088/0957-4484/17/21/024

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

We report in this paper the growth of PbS shells over colloidal PbSe nanocrystal quantum dots (NQDs) with monolayer-precision. The technique of successive ion layer adsorption and reaction (SILAR) has been adapted to the growth of high-quality core-shell nanocrystals. The core-shell infrared NQDs were ligand-exchanged with short-chain octylamine, and the photoluminescence efficiency of the surface-engineered core-shell nanoparticles was substantially higher than that of the plain core structures undergoing the same surface processing, which reveals less ligand dependence and enhanced chemical robustness in the core-shell NQDs. The reported results open up the possibility of incorporating semiconductor infrared NQDs in the silicon matrix to develop all-inorganic light-emitting heterojunctions on silicon substrates.

引用

页码：5428 / 5434

页数：7

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