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利用粘有光纤探针的石英调谐音叉,可实现近场扫描光学显微镜(NSOM)和调谐音叉剪切力显微镜(TSM)光纤探针尖端与样品(T-S)间距离的控制。研究了石英调谐音叉控制T-S间剪切力作用的机制,建立了音叉T-S系统的振动方程,理论分析了音叉电流I和T-S间距d的关系,建立了T-S间剪切力作用机制模型。实验测量了不同环境和不同样品下的I-d曲线,实验结果与理论分析相吻合。揭示了nm尺度下,由于毛细凝聚作用在T-S间耦合的H2O和C-H化合物分子所形成的粘滞阻尼是导致T-S间剪切力作用的主要原因。
Using quartz-tuned tuning-fork with a fiber probe, control of the distance between the NSOM and TSM tip and sample (T-S) can be achieved. The mechanism of quartz tuning fork controlling the shear force between T-S and the vibration equation of tuning fork T-S system are established. The relationship between tuning fork current I and T-S spacing d is theoretically analyzed, and the mechanism model of shear force between T-S is established. The I-d curves under different environments and different samples were measured experimentally, and the experimental results were in good agreement with the theoretical analysis. It is found that the viscous damping caused by the molecules of H2O and C-H coupling between T-S at the nm scale is the main cause of the shear force between T-S.