期刊
JOURNAL OF ELECTRON MICROSCOPY
卷 61, 期 2, 页码 99-103出版社
OXFORD UNIV PRESS
DOI: 10.1093/jmicro/dfr100
关键词
transmission electron microscopy; aberration correction; in situ; nanoparticles
类别
资金
- Japan Fine Ceramics Center
- Chubu Economic Federation
- Aichi Prefecture
- JSPS
We study in situ behavior of platinum single atoms on amorphous carbon (a-carbon) using a spherical aberration-corrected transmission electron microscope (AC-TEM). Diffusion of single atoms, bi-atoms, clusters (< 1 nm) and nanoparticles (< 3 nm) was recorded in the same image with a time resolution of 1 s, and such diffusion matches the expected mechanism of Ostwald ripening, which was seen on these samples. In situ AC-TEM shows promise for dynamical observation of single atom diffusion, which is important for understanding nanosized catalysts and ceramic sintering processes. We apply in situ AC-TEM to image platinum (Pt) nanoparticles on a-carbon, which is a model catalyst system for the real Pt electrode catalysts using alloys and core-shell structures supported on carbon/oxide composite materials in the proton exchange membrane fuel cell.
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