Photoinduced Stiffening in ZnO Nanobelts

被引：30
|
作者：
Zhao, M. H. [1 ]
Ye, Zhi-Zhen [2 ]
Mao, S. X. [1 ,2 ]
机构：
[1] Univ Pittsburgh, Dept Mech Engn & Mat Sci, Pittsburgh, PA 15261 USA
[2] Zhejiang Univ, Dept Mat Sci & Engn, Hangzhou 310027, Zhejiang, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2009年 / 102卷 / 04期
基金：
美国国家科学基金会;
关键词：
BRILLOUIN-SCATTERING; THIN-FILMS; SILICON;
D O I：
10.1103/PhysRevLett.102.045502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report the observation of remarkable photoinduced stiffening in a single ZnO nanobelt using nanoindentation and atomic force microscopy. The apparent elastic modulus of a ZnO nanobelt under illumination with a photon energy greater than the band gap becomes much larger than that under darkness. The physical mechanism for the observed phenomena is analyzed in terms of the surface effect and the electronic strain induced by the photogeneration of free carriers in a ZnO nanobelt.
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页数：4
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