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

Kenta Yoshida, Alexander Bright, Nobuo Tanaka

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)99-103
Number of pages5
JournalJournal of Electron Microscopy
Volume61
Issue number2
DOIs
Publication statusPublished - 2012 Apr 1
Externally publishedYes

Keywords

  • Aberration correction
  • In situ
  • Nanoparticles
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Instrumentation

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