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

页码：11556 / 11565

页数：10

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