Thermally induced atomic reconstruction of PbSe/CdSe core/shell quantum dots into PbSe/CdSe bi-hemisphere hetero-nanocrystals

被引：50
|
作者：
Grodzinska, Dominika [1 ]
Pietra, Francesca [1 ]
van Huis, Marijn A. [2 ,3 ]
Vanmaekelbergh, Daniel [1 ]
Donega, Celso de Mello [1 ]
机构：
[1] Univ Utrecht, Debye Inst Nanomat Sci, NL-3508 TA Utrecht, Netherlands
[2] Delft Univ Technol, Kavli Inst Nanosci, NL-2628 CJ Delft, Netherlands
[3] Univ Antwerp, EMAT, B-2020 Antwerp, Belgium
来源：
JOURNAL OF MATERIALS CHEMISTRY | 2011年 / 21卷 / 31期
关键词：
PBSE NANOCRYSTALS; ELECTRONIC-STRUCTURE; DIFFUSION; LUMINESCENCE; INTERFACE; EMISSION; EPITAXY; SURFACE; FACETS; GROWTH;
D O I：
10.1039/c0jm04458j
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The properties of hetero-nanocrystals (HNCs) depend strongly on the mutual arrangement of the nanoscale components. In this work we have investigated the structural and morphological evolution of colloidal PbSe/CdSe core/shell quantum dots upon annealing under vacuum. Prior to annealing the PbSe core has an approximately octahedral morphology with eight {111} facets, and the CdSe shell has zinc-blende crystal structure. Thermal annealing under vacuum at temperatures between 150 degrees C and 200 degrees C induces a structural and morphological reconstruction of the HNCs whereby the PbSe core and the CdSe shell are reorganized into two hemispheres joined by a common {111} Se plane. This thermally induced reconstruction leads to considerable changes in the optical properties of the colloidal PbSe/CdSe HNCs.
引用
收藏
页码：11556 / 11565
页数：10
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