Direct observation of the initial process of Ostwald ripening using spherical aberration-corrected transmission electron microscopy

Kenta Yoshida, Alexander Bright, Nobuo Tanaka

研究成果: Article査読

33 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)99-103
ページ数5
ジャーナルJournal of Electron Microscopy
61
2
DOI
出版ステータスPublished - 2012 4
外部発表はい

ASJC Scopus subject areas

  • 器械工学

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