Phase contrast imaging of nanocomposites and molecularly thick lubricant films in magnetic media
Phase contrast imaging of nanocomposites and molecularly thick lubricant films in magnetic media
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DOI：
10.1088/0957-4484/14/8/309
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发表时间：
2003-08-01
期刊：
影响因子：
3.5
通讯作者：
Qi, J
中科院分区：
文献类型：
--
作者：
Bhushan, B;Qi, J
研究了原子力显微镜测量中相位差的来源以及自由振幅和设定点对几种纳米复合材料和分子厚润滑膜的相位差图像的影响。相位角对比度取决于粘弹性和界面粘附，以及自由振幅和设定点的选择。相位角对比度是随着自由振幅或设定点增加的粘弹性性质的更强函数。然而，粘附对相位角对比度的影响在低自由振幅或设定点处变得更加主导。由于粘弹性和粘附力之间的竞争，相位角对比度可能随着自由振幅和设定点的变化而翻转。地形，摩擦和相位角图像之间的比较表明，相位角图像提供的信息，不能从地形或摩擦图像。通过优化自由振幅和设定值，相位角对比成像技术可以用于检测聚合物纳米复合材料和分子厚润滑表面的组成变化。
The sources of phase angle contrast in measurements using atomic force microscopy and the effect of free amplitude and setpoint on phase angle contrast images of several nanocomposites and molecularly thick lubricant films have been studied. Phase angle contrast depends on viscoelastic properties and interfacial adhesion, as well as on the selection of free amplitude and setpoint. Phase angle contrast is a stronger function of viscoelastic properties with increasing free amplitude or setpoint. However, the effect of adhesion on phase angle contrast becomes more dominant at low free amplitudes or setpoints. As a result of competition between viscoelasticity and adhesion, the phase angle contrast may flip with changes in free amplitude and setpoint. A comparison between topographic, friction and phase angle images shows that phase angle images give information that cannot be obtained from topographic or friction images. By optimizing free amplitude and setpoint, the phase angle contrast imaging technique can be used to detect changes in composition across polymer nanocomposites and molecularly thick lubricated surfaces.