Mechanical properties of ZnO nanowires under different loading modes
Mechanical properties of ZnO nanowires under different loading modes
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DOI：
10.1007/s12274-010-1030-4
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发表时间：
2010-03
期刊：
影响因子：
9.9
通讯作者：
F. Xu;Q. Qin;A. Mishra;Y. Gu;Yong Zhu
中科院分区：
文献类型：
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作者：
F. Xu;Q. Qin;A. Mishra;Y. Gu;Yong Zhu
对不同加载方式下的氧化锌纳米线的弹性和破坏特性进行了系统的实验和理论研究。在现场扫描电子显微镜下，对单个氧化锌纳米线进行了沿极向[0001]的拉伸和屈曲测试。当NW直径从80 nm减小到20 nm时，拉伸模量(由拉伸引起)和弯曲模量(由屈曲引起)均增大。弯曲弹性模量的增长速度快于拉伸弹性模量的增长速度，说明纳米氧化锌纳米管的弹性尺寸效应主要是由于表面硬化引起的。基于连续介质力学的两个模型均能很好地拟合实验数据。拉伸实验表明，随着纳米管直径的减小，断裂应变和断裂强度增大。纳米氧化锌具有良好的弹性，有利于其在纳米尺度的驱动、传感和能量转换等方面的应用。
A systematic experimental and theoretical investigation of the elastic and failure properties of ZnO nanowires (NWs) under different loading modes has been carried out.In situscanning electron microscopy (SEM) tension and buckling tests on single ZnO NWs along the polar direction [0001] were conducted. Both tensile modulus (from tension) and bending modulus (from buckling) were found to increase as the NW diameter decreased from 80 to 20 nm. The bending modulus increased more rapidly than the tensile modulus, which demonstrates that the elasticity size effects in ZnO NWs are mainly due to surface stiffening. Two models based on continuum mechanics were able to fit the experimental data very well. The tension experiments showed that fracture strain and strength of ZnO NWs increased as the NW diameter decreased. The excellent resilience of ZnO NWs is advantageous for their applications in nanoscale actuation, sensing, and energy conversion.