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Cluster ‘Contact Epitaxy’- Direct Evidence for Novel Particle: Substrate Interactions

Published online by Cambridge University Press:  10 February 2011

M. Yeadon ,
J.C. Yang ,
M. Ghaly ,
R.S. Averback  and
J.M. Gibson
M. Yeadon
Affiliation:
Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801
J.C. Yang
Affiliation:
Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801
M. Ghaly
Affiliation:
Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801
R.S. Averback
Affiliation:
Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801
J.M. Gibson
Affiliation:
Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana IL 61801
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Abstract

In this paper we describe observations of novel interactions between clusters of Ag deposited on the clean (001) Cu surface. The experiments are analogous to those performed by Gleiter and co-workers in the 1970's, where grain boundary orientations in particles of Cu and Ag supported on single crystal metal substrates were studied. Upon annealing close to the melting point, these particles (∼10–100μm in diameter) were found to rotate on the surface, forming low-energy grain boundary configurations with the substrate. The particles studied in our experiments are ∼104 times smaller, and show rather different behavior. In the case of Ag nanoparticles we have observed a novel phenomenon, which we call ‘contact epitaxy’, involving the formation of several monolayers of epitaxially oriented Ag at the Cu surface upon contact between this surface and the Ag cluster. The phenomenon may be understood from molecular dynamics simulations of the ‘soft impact’ between the nanoparticle and surface, which indicate that the ordered layers form within picoseconds of contact. We will discuss the mechanisms by which ‘contact epitaxy’ is believed to occur.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 570: Symposium V – Epitaxial Growth , 1999 , 279
Copyright
Copyright © Materials Research Society 1999

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References

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