Conversion of Zinc Oxide Nanobelts into Superlattice-Structured Nanohelices

作者：Pu Gao, Yong Ling Ding, Wenjie Mai, William L. Hughes, Changshi Lao, Zhong Lin Wang · 发表于：Science · 年份：2005 · DOI：10.1126/science.1116495 · 被引用次数：864 · 研究领域：Advanced Sensor and Energy Harvesting Materials、Advanced Materials and Mechanics、ZnO doping and properties

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 ( \batchmode \documentclass[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \(01{\bar{1}}0\) \end{document} ) surfaces. The nanohelix could be manipulated, and its elastic properties were measured, which suggests possible uses in electromechanically coupled sensors, transducers, and resonators.