Mechanical characterization of nanoporous Au modified with self-assembled monolayers
Mechanical characterization of nanoporous Au modified with self-assembled monolayers
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DOI：
10.1063/1.4972780
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发表时间：
2016-12
影响因子：
4
通讯作者：
N. Miyazawa;J. Ishimoto;M. Hakamada;M. Mabuchi
中科院分区：
文献类型：
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作者：
N. Miyazawa;J. Ishimoto;M. Hakamada;M. Mabuchi
采用6-巯基-1-己醇自组装膜（SAM）对纳米多孔Au进行表面修饰，并对修饰前后的纳米多孔Au进行硬度测试，研究SAM修饰对纳米多孔Au力学性能的影响。此外，化学力学效应的起源进行了研究的第一性原理剪切试验模拟上的Au-S合金。SAM改性的纳米多孔Au显示出比未改性的纳米多孔Au更低的硬度。加载速率依赖性测试表明，活化体积都很低，表明短距离的事件在纳米多孔Au的变形中起着重要的作用，无论纳米多孔Au是否与自组装膜改性。模拟结果表明，SAM改性纳米多孔Au的硬度较低，是因为Au-S键合的化学效应促进了表面位错端点的移动。
The surface of nanoporous Au was modified with self-assembled monolayers (SAMs) of 6-mercapto-1-hexanol and the hardness tests were performed on the SAM-modified and non-modified nanoporous Au to investigate the effects of SAM modification on the mechanical properties of nanoporous Au. In addition, the origin of the chemomechanical effects was investigated by first principles shear test simulations on an Au–S alloy. The SAM-modified nanoporous Au showed lower hardness than the non-modified nanoporous Au. The loading rate dependence tests showed that the activation volume was low for both, indicating that events of a short range play an important role in deformation of nanoporous Au, regardless of whether the nanoporous Au was modified with SAMs. It was suggested from the simulations that the lower hardness for the SAM-modified nanoporous Au is because movement of dislocation endpoints at the surface is facilitated by chemical effects of Au–S bonding.