Spontaneous polarization-induced nanohelixes, nanosprings, and nanorings of piezoelectric nanobelts

被引：1060

作者：

Kong, XY ^{[1
]}

Wang, ZL ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA

来源：

NANO LETTERS | 2003年 / 3卷 / 12期

关键词：

D O I：

10.1021/nl034463p

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Growth of (0001) facet-dominated, free-standing, piezoelectric zinc oxide (ZnO) nanostructures is challenged by the divergence of the surface energy due to intrinsic polarization. By controlling growth kinetics, we show the success of growing nanobelt-based novel structures whose surfaces are dominated by the polarized +/- (0001) facets. Owing to the positive and negative ionic charges on the zinc- and oxygen-terminated +/- (0001) surfaces, respectively, a spontaneous polarization is induced across the nanobelt thickness. As a result, right-handed helical nanostructures and nanorings are formed by rolling up single-crystal nanobelts; this phenomenon is attributed to a consequence of minimizing the total energy contributed by spontaneous polarization and elasticity. The polar-surface-dominated ZnO nanobelts are likely to be an ideal system for understanding piezoelectricity and polarization-induced ferroelectricity at nanoscale; and they could have applications as one-dimensional nanoscale sensors, transducers, and resonators.

引用

页码：1625 / 1631

页数：7

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