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In situ mechanical resonance behaviour of pristine and defective zinc blende GaAs nanowires†
Nanoscale ( IF 5.8 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1039/c7nr07449b Edmund Pickering 1, 2, 3, 4, 5 , Arixin Bo 1, 2, 3, 4, 5 , Haifei Zhan 5, 6, 7, 8, 9 , Xiaozhou Liao 5, 10, 11, 12, 13 , Hark Hoe Tan 5, 14, 15, 16, 17 , YuanTong Gu 1, 2, 3, 4, 5
Nanoscale ( IF 5.8 ) Pub Date : 2018-01-04 00:00:00 , DOI: 10.1039/c7nr07449b Edmund Pickering 1, 2, 3, 4, 5 , Arixin Bo 1, 2, 3, 4, 5 , Haifei Zhan 5, 6, 7, 8, 9 , Xiaozhou Liao 5, 10, 11, 12, 13 , Hark Hoe Tan 5, 14, 15, 16, 17 , YuanTong Gu 1, 2, 3, 4, 5
Affiliation
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The structural versatility of semiconducting gallium arsenide (GaAs) nanowires (NWs) provides an exciting direction for the engineering of their mechanical and dynamic properties. However, the dynamic behaviour of GaAs NWs remains unexplored. In this study, comprehensive in situ mechanical resonance tests were conducted to explore the dynamic behaviour of pristine and defective zinc blende GaAs NWs. The effects of stacking faults (SFs), amorphous shell, NW tapering and end-mass particles were investigated. The quality factors (QFs) of the GaAs NWs were found to be predominately governed by surface effects, which increased linearly with the volume to surface area ratio. Interestingly, SFs were found not to influence the QFs. To extract the mechanical properties, the Euler–Bernoulli beam theory was modified, to incorporate the core–shell model, NW tapering and end-mass particles. It was found that the core–shell model accurately predicts the mechanical properties of the pristine GaAs NWs, which exhibit significant stiffening at radii below 50 nm. Conversely, the mechanical properties of the defective NWs were influenced by the presence of SFs, causing a wide variance in the Young's modulus. Apart from establishing an understanding of the resonance behaviour of GaAs NWs, this research provides guidance for the design of NWs for their applications in dynamic nanomechanical devices with tailorable dynamic properties.
中文翻译：
原始和有缺陷的锌混合GaAs纳米线的原位机械共振行为†
半导体砷化镓（GaAs）纳米线（NWs）的结构多功能性为其工程的机械和动态特性提供了令人兴奋的方向。但是，GaAs NW的动态行为仍未得到探索。在这项研究中，原位综合进行了机械共振测试，以探究原始和有缺陷的锌混合GaAs NW的动力学行为。研究了堆垛层错（SFs），非晶壳，NW锥度和末端质量颗粒的影响。发现GaAs NW的质量因子（QFs）主要受表面效应支配，表面效应随体积与表面积之比线性增加。有趣的是，发现科幻小说不影响QF。为了提取机械性能，对欧拉-伯努利梁理论进行了修改，以合并核-壳模型，NW锥形和末端质量粒子。研究发现，核-壳模型可以准确地预测原始GaAs NWs的机械性能，它们在低于50 nm的半径处会表现出明显的变硬。反过来，SF的存在会影响有缺陷的NW的机械性能，从而导致杨氏模量变化很大。除了建立对GaAs NWs共振行为的理解之外，这项研究还为NWs在具有可定制动态特性的动态纳米机械装置中的应用提供了设计指导。
更新日期：2018-01-04
中文翻译：
原始和有缺陷的锌混合GaAs纳米线的原位机械共振行为†
半导体砷化镓（GaAs）纳米线（NWs）的结构多功能性为其工程的机械和动态特性提供了令人兴奋的方向。但是，GaAs NW的动态行为仍未得到探索。在这项研究中，原位综合进行了机械共振测试，以探究原始和有缺陷的锌混合GaAs NW的动力学行为。研究了堆垛层错（SFs），非晶壳，NW锥度和末端质量颗粒的影响。发现GaAs NW的质量因子（QFs）主要受表面效应支配，表面效应随体积与表面积之比线性增加。有趣的是，发现科幻小说不影响QF。为了提取机械性能，对欧拉-伯努利梁理论进行了修改，以合并核-壳模型，NW锥形和末端质量粒子。研究发现，核-壳模型可以准确地预测原始GaAs NWs的机械性能，它们在低于50 nm的半径处会表现出明显的变硬。反过来，SF的存在会影响有缺陷的NW的机械性能，从而导致杨氏模量变化很大。除了建立对GaAs NWs共振行为的理解之外，这项研究还为NWs在具有可定制动态特性的动态纳米机械装置中的应用提供了设计指导。
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