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Science 27 February 2004:
Vol. 303. no. 5662, pp. 1348 - 1351
DOI: 10.1126/science.1092356
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Reports

Single-Crystal Nanorings Formed by Epitaxial Self-Coiling of Polar Nanobelts

Xiang Yang Kong, Yong Ding, Rusen Yang, Zhong Lin Wang*

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.

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

* To whom correspondence should be addressed. E-mail: zhong.wang{at}mse.gatech.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Polarity Determination for the CdxZn1-xS Nanocombs by EELS.
X. Z. Zhang, T. Y. Zhai, Y. Ma, J. N. Yao, and D. P. Yu (2008)
J. Electron Microsc. (Tokyo) 57, 7-11
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Piezoelectric nanogenerators based on zinc oxide nanowire arrays..
Z. L. Wang and J. Song (2006)
Science 312, 242-246
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Conversion of Zinc Oxide Nanobelts into Superlattice-Structured Nanohelices.
P. X. Gao, Y. Ding, W. Mai, W. L. Hughes, C. Lao, and Z. L. Wang (2005)
Science 309, 1700-1704
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Science. ISSN 0036-8075 (print), 1095-9203 (online)