期刊
NANO LETTERS
卷 11, 期 8, 页码 3420-3424出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl201826e
关键词
Electron tomography; semiconductor nanocrystals; core-shell particles; cation exchange
类别
资金
- European Union under a contract for an Integrated Infrastructure Initiative [026019 ESTEEM]
- Seventh Framework Program [EU-FP7]
- Integrated Infrastructure Initiative [262348]
- European Soft Matter Infrastructure, ESMI
- Fund for Scientific Research-Flanders [G.0247.08, G.0393.11]
Colloidal core-shell semiconductor nanocrystals form an important class of optoelectronic materials, in which the exciton wave functions can be tailored by the atomic configuration of the core, the interfacial layers, and the shell. Here, we provide a trustful 3D characterization at the atomic scale of a freestanding PbSe(core)-CdSe(shell) nanocrystal by combining electron microscopy and discrete tomography. Our results yield unique insights for understanding the process of cation exchange, which is widely employed in the synthesis of core-shell nanocrystals. The study that we present is generally applicable to the broad range of colloidal heteronanocrystals that currently emerge as a new class of materials with technological importance.
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