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Motion of Gold Atoms on Carbon in the Aberration-Corrected STEM

Published online by Cambridge University Press:  21 December 2007

Philip E. Batson
Philip E. Batson
Affiliation:
IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598, USA
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Abstract

The movement of heavy atoms on a thin carbon substrate is readily observed using a sub-Ångstrom 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.

Keywords

atom movementnanoparticlesaberration correctionSTEMHAADF
Type
Research Article
Information
Microscopy and Microanalysis , Volume 14 , Issue 1: Special Issue: Materials Research in an Aberration-Free Environment , February 2008 , pp. 89 - 97
Copyright
© 2008 Microscopy Society of America

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