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Preferred heteroepitaxial orientations of ZnO nanorods on Ag

Published online by Cambridge University Press:  31 January 2011

J.A. Floro ,
J.R. Michael ,
L.N. Brewer  and
J.W.P. Hsu
J.A. Floro*
Affiliation:
University of Virginia, Department of Materials Science and Engineering, Charlottesville, Virginia 22904
J.W.P. Hsu
Affiliation:
Sandia National Laboratories, Albuquerque, New Mexico 87185
*
a)Address all correspondence to this author. e-mail: floro@virginia.edu
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Abstract

Wurtzite ZnO nanorods were grown from solution onto coarse-grain bulk polycrystalline Ag substrates to explore the nature of preferred heteroepitaxial orientations. ZnO nanorods grow copiously on grains with <111> and <001> surface normals. Two epitaxial orientations were observed: {0001} ZnO ‖ {111} Ag with <20> ZnO ‖ <10> Ag and {0001} ZnO ‖ {001} Ag with <20> ZnO ‖ <10> Ag. Both feature ZnO basal plane growth, and the specific in-plane orientation relationships both feature alignment of close-packed directions in the interface. Nanorod growth was strongly suppressed on Ag grains in most other orientations. Although strain energy minimization is often invoked to explain the {0001} ZnO ‖ {111} Ag with <20> ZnO ‖ <10> Ag orientation, associated with an almost ideal near-coincidence site lattice matching, our data suggests that strain may not be the sole, or even the most important, determinant of the preferred orientations during solution-based epitaxial growth in this system.

Keywords

EpitaxyChemical synthesisNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 7 , July 2010 , pp. 1352 - 1361
Copyright
Copyright © Materials Research Society 2010

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