Conversion of zinc oxide nanobelts into superlattice-structured nanohelices |
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| Authors: | Gao Pu Xian Ding Yong Mai Wenjie Hughes William L Lao Changshi Wang Zhong Lin |
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| Institution: | School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245, USA. |
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| Abstract: | A previously unknown rigid helical structure of zinc oxide consisting of a superlattice-structured nanobelt was formed spontaneously in a vapor-solid growth process. Starting from a single-crystal stiff nanoribbon dominated by the c-plane polar surfaces, an abrupt structural transformation into the superlattice-structured nanobelt led to the formation of a uniform nanohelix due to a rigid lattice rotation or twisting. The nanohelix was made of two types of alternating and periodically distributed long crystal stripes, which were oriented with their c axes perpendicular to each other. The nanohelix terminated by transforming into a single-crystal nanobelt dominated by nonpolar (0110) surfaces. The nanohelix could be manipulated, and its elastic properties were measured, which suggests possible uses in electromechanically coupled sensors, transducers, and resonators. |
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