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Open Access Nano Express

Anisotropic epitaxial ZnO/CdO core/shell heterostructure nanorods

Sang Hyun Lee*, Chad M Parish and Jun Xu*

Author Affiliations

Oak Ridge National Laboratory, P.O. Box 2008, Oak Ridge, TN 37831, USA

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Nanoscale Research Letters 2012, 7:626  doi:10.1186/1556-276X-7-626

Published: 14 November 2012

Abstract

Various surface structures and polarities of one-dimensional nanostructures offer additional control in synthesizing heterostructures suitable for optoelectronic and electronic applications. In this work, we report synthesis and characterization of ZnO-CdO nanorod-based heterostructures grown on a-plane sapphire. The heterojunction formed on the sidewall surface of the nanorod shows that wurtzite ZnO {1010} planes are interfaced with rocksalt CdO {100}. This is evidently different from the heterojunction formed on the nanorod top surface, where a ZnO (0001) top plane is interfaced with a CdO (111) plane. Such anisotropic heterostructures are determined by different surface structures of the nanorods and their polarities. Revelation of such anisotropic heterojunctions will provide a clue for understanding charge transport properties in electronic and optoelectronic nanodevices.

Keywords:
ZnO nanorod; CdO; Heterojunction; Anisotropy