Mechanical Properties of Vapor-Liquid-Solid Synthesized Silicon Nanowires
Mechanical Properties of Vapor-Liquid-Solid Synthesized Silicon Nanowires
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DOI：
10.1021/nl902132w
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发表时间：
2009-11-01
期刊：
影响因子：
10.8
通讯作者：
Lu, Wei
中科院分区：
文献类型：
--
作者：
Zhu, Yong;Xu, Feng;Lu, Wei
测量了直径为15 ~ 60 nm、长度为1.5 ~ 4.3 μ m的硅纳米线的杨氏模量和断裂强度。通过气-液-固工艺生长的纳米线在扫描电子显微镜内进行原位拉伸测试。的杨氏模量下降，而断裂强度增加到12.2 GPa，作为纳米线直径减小。断裂强度也随着侧表面积的减小而增加;化学合成的硅纳米线的增加率被发现远高于微加工的硅薄膜。在拉伸试验过程中反复加载和卸载表明，纳米线是线性弹性的，直到断裂，没有明显的塑性。
The Young's modulus and fracture strength of silicon nanowires with diameters between 15 and 60 nm and lengths between 1.5 and 4.3 mu m were measured. The nanowires, grown by the vapor-liquid-solid process, were subjected to tensile tests in situ inside a scanning electron microscope. The Young's modulus decreased while the fracture strength increased up to 12.2 GPa, as the nanowire diameter decreased. The fracture strength also increased with the decrease of the side surface area; the increase rate for the chemically synthesized silicon nanowires was found to be much higher than that for the microfabricated silicon thin films. Repeated loading and unloading during tensile tests demonstrated that the nanowires are linear elastic until fracture without appreciable plasticity.