Title
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Thermally induced atomic reconstruction of PbSe/CdSe core/shell quantum dots into PbSe/CdSe bi-hemisphere hetero-nanocrystals
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Author
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Abstract
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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. |
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Language
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English
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Source (journal)
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Journal of materials chemistry / Royal Society of Chemistry [London] - Cambridge, 1991 - 2012
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Publication
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Cambridge
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2011
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ISSN
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0959-9428
1364-5501
[online]
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DOI
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10.1039/C0JM04458J
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Volume/pages
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21
:31
(2011)
, p. 11556-11565
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ISI
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000293190200018
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Full text (Publisher's DOI)
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Full text (open access)
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