College of Mechanical and Electrical Engineering, Beijing University of Chemical Technology, Beijing, China.
J Microsc. 2021 Sep;283(3):219-231. doi: 10.1111/jmi.13035. Epub 2021 Jun 4.
The phase information reflects the energy dissipation of the probe and sample interactions in tapping mode atomic force microscopes (TM AFMs). In this paper, we use the method of tune test in TM AFM to study the contribution of external environment to energy dissipation by changing the probe position and ambient humidity. Finally, the theoretical and experimental quality factors of air viscous damping, squeeze film damping and liquid bridge force are obtained to characterise energy dissipation. The analytically predicted values of the model established on squeeze film damping, viscous damping and liquid bridge force comparing to the experimental results in this paper is rational. And the comparative analysis results show that the main mechanism of energy dissipation is different at different probe positions and different relative humidness. This result is of great significance for understanding the mechanism of phase imaging experimentally and theoretically.
相位信息反映了探针与样品在敲击模式原子力显微镜（TM AFM）中的相互作用的能量耗散。在本文中，我们使用 TM AFM 中的调谐测试方法通过改变探针位置和环境湿度来研究外部环境对能量耗散的贡献。最后，通过获得空气粘性阻尼、挤压膜阻尼和液桥力的理论和实验品质因数来描述能量耗散。与本文的实验结果相比，对挤压膜阻尼、粘性阻尼和液桥力建立的模型的分析预测值是合理的。比较分析结果表明，在不同探针位置和不同相对湿度下，能量耗散的主要机制不同。这一结果对于从实验和理论上理解相成像机制具有重要意义。
