Atomic Structure of Wurtzite CdSe (Core)/CdS (Giant Shell) Nanobullets Related to Epitaxy and Growth

Eva Bladt, Relinde Moes, Joep Peters, Federico Montanarella, Celso De Mello Donega, Daniël Vanmaekelbergh, Sara Bals*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

Heteronanocrystals consisting of a CdSe core and a giant CdS shell have shown remarkable optical properties which are promising for applications in opto-electrical devices. Since these properties sensitively depend on the size and shape, a morphological characterization is of high interest. Here, we present a high angle annular dark field scanning transmission electron microscopy (HAADF-STEM) study of CdSe (core)/CdS (giant shell) heteronanocrystals. Electron tomography reveals that the nanocrystals have a bullet shape, either ending in a tip or a small dip, and that the CdSe core is positioned closer to the tip (or dip) than to the hexagonal base. Based on a high resolution HAADF-STEM study, we were able to determine all the surface facets. We present a heuristic model for the different growth stages of the CdS crystal around the CdSe core.

Original languageEnglish
Pages (from-to)14288-14293
Number of pages6
JournalJournal of the American Chemical Society
Volume138
Issue number43
DOIs
Publication statusPublished - 2 Nov 2016

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