The kinetic frictional shear stress of ZnO nanowires on graphite and mica substrates
The kinetic frictional shear stress of ZnO nanowires on graphite and mica substrates
复制标题
ZnO纳米线在石墨和云母基底上的动摩擦剪切应力
DOI：
10.1016/j.apsusc.2018.09.143
复制
发表时间：
2018
影响因子：
6.7
通讯作者：
Huang Han
中科院分区：
文献类型：
--
作者：
Hou Lizhen;Mead James Lee;Wang Shiliang;Huang Han
纳米结构与光滑衬底之间的摩擦剪切应力在纳米器件的发展中起着至关重要的作用；然而，它极难测量。本文采用光学显微镜纳米操作技术，在环境气氛下测量了石墨和云母衬底上六方ZnO纳米线的动摩擦剪切应力。两种衬底具有相似的亚埃级表面粗糙度值和与ZnO纳米线的界面粘附能。zno -石墨体系的动摩擦剪应力为0.51 MPa，明显低于zno -云母体系的5.1 MPa。结果表明，在完全光滑的接触界面上的动摩擦可能不受粘附的控制，而通常被称为粘附摩擦或粘附主导摩擦。与粘附的组合方程类似，我们提出了两个经验组合方程来估计两个光滑表面之间的摩擦剪切应力，使用从参考表面更简单地获得的结果。我们的实验结果和最近发表的在类似环境条件下获得的原子光滑界面系统的数据支持了方程的有效性。
The frictional shear stress between a nanostructure and a smooth substrate plays a crucial role in the development of nanodevices; however, it is extremely difficult to measure. In this work, the kinetic frictional shear stress of hexagonal ZnO nanowires on graphite and mica substrates was measured in an ambient atmosphere by optical microscope based nanomanipulation. Both substrates have similar surface roughness values of sub-angstrom-scale and interfacial adhesion energies with ZnO nanowires. Yet, a kinetic frictional shear stress of 0.51 MPa was obtained for the ZnO-graphite system, significantly lower than that of 5.1 MPa for the ZnO-mica system. The results demonstrate that the kinetic friction at a perfectly smooth contact interface may not be controlled by the adhesion, whilst being commonly referred to as adhesive friction or adhesion-dominated fiction. Similar to the combining equations for adhesion, we propose two empirical combining equations to estimate the frictional shear stress between two smooth surfaces using results more simply obtained from a reference surface. The validity of the equations is supported by our experimental results and recently published data for atomically smooth interface systems obtained under the similar environmental conditions.