Accurate formula for dissipative interaction in frequency modulation atomic force microscopy

作者：Suzuki Kazuhiro^*; Kobayashi Kei; Labuda Aleksander; Matsushige Kazumi; Yamada Hirofumi

来源：Applied Physics Letters, 2014, 105(23): 233105.

DOI：10.1063/1.4903484

Much interest has recently focused on the viscosity of nano-confined liquids. Frequency modulation atomic force microscopy (FM-AFM) is a powerful technique that can detect variations in the conservative and dissipative forces between a nanometer-scale tip and a sample surface. We now present an accurate formula to convert the dissipation power of the cantilever measured during the experiment to damping of the tip-sample system. We demonstrated the conversion of the dissipation power versus tip-sample separation curve measured using a colloidal probe cantilever on a mica surface in water to the damping curve, which showed a good agreement with the theoretical curve. Moreover, we obtained the damping curve from the dissipation power curve measured on the hydration layers on the mica surface using a nanometer-scale tip, demonstrating that the formula allows us to quantitatively measure the viscosity of a nano-confined liquid using FM-AFM.

• 出版日期2014-12-8
• 单位McGill