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Science. 2004 Feb 27;303(5662):1348-51.

Single-crystal nanorings formed by epitaxial self-coiling of polar nanobelts.

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1
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0245 USA.

Abstract

Freestanding single-crystal complete nanorings of zinc oxide were formed via a spontaneous self-coiling process during the growth of polar nanobelts. The nanoring appeared to be initiated by circular folding of a nanobelt, caused by long-range electrostatic interaction. Coaxial and uniradial loop-by-loop winding of the nanobelt formed a complete ring. Short-range chemical bonding among the loops resulted in a single-crystal structure. The self-coiling is likely to be driven by minimizing the energy contributed by polar charges, surface area, and elastic deformation. Zinc oxide nanorings formed by self-coiling of nanobelts may be useful for investigating polar surface-induced growth processes, fundamental physics phenomena, and nanoscale devices.

PMID:
14988559
DOI:
10.1126/science.1092356
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