期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 138, 期 43, 页码 14288-14293出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.6b06443
关键词
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资金
- European Research Council (ERC) [335078-COLOURATOMS]
- Flemish Fund for Scientific Research (FWO Vlaanderen)
Heteronanocrystals consisting of a CdSe core and a giant CdS shell have shown remarkable optical properties which are promising for applications in optoelectrical 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.
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