Critical shear stress of gold nanocontacts estimated by in situ transmission electron microscopy equipped with a quartz length-extension resonator
Critical shear stress of gold nanocontacts estimated by in situ transmission electron microscopy equipped with a quartz length-extension resonator
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DOI：
10.35848/1882-0786/ac09bd
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发表时间：
2021-07-01
影响因子：
2.3
通讯作者：
Oshima, Yoshifumi
中科院分区：
文献类型：
--
作者：
Liu, Jiaming;Zhang, Jiaqi;Oshima, Yoshifumi
利用自制的原位透射电镜支架，以石英长度扩展谐振器（LER）作为力传感器，对金纳米触点（nc）的临界剪切应力（CSS）进行了估算。利用调频方法将LER在其共振频率上振荡，使我们能够测量nc中的耗散能量。从耗散能的LER幅值依赖性来看，我们确定CSS的值为0.94 GPa。将该CSS值应用于具有滞回力-位移曲线的简单滑移模型，再现了耗散现象，为阐明塑性变形机制提供了可能。
The critical shear stress (CSS) of gold nanocontacts (NCs) was estimated using a home-made in situ transmission electron microscopy holder equipped with a quartz length-extension resonator (LER) as a force sensor. The LER was being oscillated at its resonance frequency utilizing frequency modulation method, enabled us to measure the dissipative energy in the NCs. From the LER amplitude dependence of dissipative energy, we determined the value of CSS to be 0.94 GPa. The dissipation was reproduced by applying this CSS value to a simple slip model with a hysteretic force-displacement curve, suggesting the possibility of elucidating the plastic deformation mechanism.