Motion of gold atoms on carbon in the aberration-corrected STEM

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Abstract

The movement of heavy atoms on a thin carbon substrate is readily observed using a sub-ngstrom electron probe. The observed movement is consistent with an electron beam activation mechanism whereby atoms are occasionally detached from bonding sites, allowing rapid diffusion to new sites that may be quite far from the original. The bonding sites are most often observed to lie at defects, steps, and other asperities in the substrate. Formation of three-dimensional clusters can occur during diffusion of several isolated atoms. Coalescence and dissolution of larger clusters and islands both occur under varying observation conditions, but island coalescence appears most probable for islands that are greater than 2 nm in size.

Original languageEnglish (US)
Pages (from-to)89-97
Number of pages9
JournalMicroscopy and Microanalysis
Volume14
Issue number1
DOIs
StatePublished - Feb 1 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Instrumentation

Keywords

  • Aberration correction
  • Atom movement
  • HAADF
  • Nanoparticles
  • STEM

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