东南大学学报（自然科学版）2012，Vol.42Issue(2)：286-289,4.DOI:10.3969/j.issn.1001-0505.2012.02.018
基于原子力显微镜的纳米尺度摩擦力的速度依赖关系
Velocity-dependent nano-scale friction under atomic force-microscope
摘要
Abstract
The effect of the scanning velocity on the friction in a convex system is studied between a Si tip and a naturally oxidized Si(100) substrate by the atomic force microscope (AFM). Firstly, the normal spring constant and the normal sensitivity of the Si cantilever are calibrated by the thermal noise calibration method. Then, the lateral sensitivity is obtained through scanning a triangular grating by the improved wedge calibration method. Finally, the friction-load relation curves with the scan area of 15 μm ×15 μm, the normal force of -5 ~ 10 nN and the scanning velocity of 2. 5 ~ 1 000 μm/s are obtained. The experimental results show that with different velocities, the friction increases nearly linearly with the load, which obeys the classical Coulomb law. When the scanning velocity is below 40 μm/s, the increase in the friction is insignificant due to the increase in the velocity. In contrast, when the velocity exceeds 40 μm/s, the friction enhancement becomes significant. The nonlinear correlation between the frictional force and the scanning velocity coincides with the results computed by the thermally-excited Tomlinson model.关键词
原子力显微镜/摩擦力/扫描速度/非线性Key words
atomic force microscope/ friction/ scanning velocity/ nonlinear分类
机械制造引用本文复制引用
张艳,卜浩,王玉娟,陈云飞..基于原子力显微镜的纳米尺度摩擦力的速度依赖关系[J].东南大学学报（自然科学版）,2012,42(2):286-289,4.基金项目
国家重大基础研究发展计划(973计划)资助项目(2011CB707605)、国家自然科学基金资助项目(50875047,50925519)、江苏省自然科学基金资助项目(BK2008201). （973计划）
