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Microstructure of precipitated Au Nanoclusters in Single Crystal MgO

Published online by Cambridge University Press:  11 February 2011

C. M. Wang ,
S. Thevuthasan ,
V. Shutthanandan ,
A. Cavanagh ,
J. Walton ,
W. Jiang ,
W. J. Weber ,
L. E. Thomas ,
L. M. Wang  and
Jie Lian
C. M. Wang
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
S. Thevuthasan
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
V. Shutthanandan
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
A. Cavanagh
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
J. Walton
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
W. Jiang
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
W. J. Weber
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
L. E. Thomas
Affiliation:
Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
L. M. Wang
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109, USA
Jie Lian
Affiliation:
Department of Nuclear Engineering and Radiological Sciences, The University of Michigan, Ann Arbor, Michigan 48109, USA
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Abstract

Gold nanoclusters dispersed in single crystal MgO were prepared by ion implantation and subsequent annealing at 1000 °C. The morphological feature, size, crystallographic orientation of the Au nanoclusters with respect to the MgO matrix, and the interface structure between the Au nanoclusters and MgO were investigated using transmission electron microscopy. During annealing, the Au clusters nucleate coherently in the MgO lattice, leading to an epitaxial orientation relationship of [010] MgO// [010]Au and (200)MgO//(200)Au that is maintained for all the Au clusters. A critical size for the coherent-semicoherent interface transition is observed to be in the range from ∼5 to 8 nm for Au clusters in MgO. Au clusters larger than this critical size exhibit faceting on the {001} planes. The precipitated Au also exhibits internal dislocations.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 738: Symposium G – Spatially Resolved Characterization of Local Phenomena in Materials and Nanostructures , 2002 , G15.2
Copyright
Copyright © Materials Research Society 2003

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References

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