Issue 31, 2011
From the journal:

Journal of Materials Chemistry

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

Dominika Grodzińska,*a   Francesca Pietra,a   Marijn A. van Huis,bc   Daniel Vanmaekelbergh*a  and  Celso de Mello Donegá*a  

* Corresponding authors

a Condensed Matter and Interfaces, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, Utrecht, The Netherlands
E-mail: c.demello-donega@uu.nl, d.vanmaekelbergh@uu.nl

b Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, The Netherlands

c EMAT, University of Antwerp, Groenenborgerlaan 171, Antwerp, Belgium

Abstract

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 °C and 200 °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.

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

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Article information

DOI
https://doi.org/10.1039/C0JM04458J
Article type
Paper
Submitted
20 Dec 2010
Accepted
23 Mar 2011
First published
21 Apr 2011

J. Mater. Chem., 2011,21, 11556-11565

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

D. Grodzińska, F. Pietra, M. A. van Huis, D. Vanmaekelbergh and C. de Mello Donegá, J. Mater. Chem., 2011, 21, 11556 DOI: 10.1039/C0JM04458J

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