摘要
原子力显微镜测定的力曲线需转化为力位移曲线来应用。力位移曲线是以任意点为零点的,当研究粘附或者分子模型对比时,需要知道针尖样品间的作用力或确切的零点位置,这时需将其转化为力-距离曲线。本文首先从力曲线的测定原理得出了典型的力曲线,之后从理论上分析了力曲线、力位移曲线和力-距离曲线间的转化,从中得出了转化过程中需要的两个重要参量:灵敏度和零距离,并提出了确定方法。最后,利用MATLAB实现了曲线的自动转化。
Force curve measured by Atomic Force Microscope needs to be converted into force-displacement curve for application. The zero point in the force-displacement curve is arbitrary. When adhesion or comparison with molecular models is studied, it is vital to know the force between the sample and the tip or whether the tip and the sample are contact or not. So the force-displacement curve needs to be converted into the force-distance curve. In this thesis, at first the classical force curve was obtained according to principle of measurement. Then the theory of conversion is discussed. From the theory two key parameters are gotten： sensitivity and zero distance. Then the method is provided to know them. At last, the curves＇ auto-conversion was realized by MATLAB program.
出处
《机械》
2007年第12期5-8,共4页
Machinery
基金
教育部科学技术研究重点项目支撑(NO.106018)
关键词
力曲线
力位移曲线
力-距离曲线
原子力显微镜
force curve
force-displacement curve
force-distance curve
atomic force microscope
