期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 47, 页码 14183-14186出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201507263
关键词
cation exchange; nanoparticles; PbSe; reaction kinetics; ZnSe
资金
- German Research Foundation (DFG) via the Cluster of Excellence Centre for Ultrafast Imaging (CUI)
How can ion-exchange process occur in nanocrystals without the size and shape changing and why is the ion transport much faster than in classical interdiffusion processes in macrocrystalline solids? We have investigated these processes at the molecular level by means of high-resolution and analytical electron microscopy in temperature-dependent kinetic experiments for several model reactions. The results clearly show a diffusion process that proceeds exclusively through the interstitial lattice positions with a subsequent kick out to remove individual ions from lattice sites without the formation of vacancies. This mechanism has not been observed in nanocrystalline systems before.
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