Research Information System
19th International Nanoscience and Nanotechnology Conference (NanoTR-19), Middle East Technical University, Ankara, Turkey, 27 - 29 August 2025, pp.1, (Summary Text)
Driving the micro-cantilever
at the resonance frequency enhances sensitivity to tip-sample interaction
forces in single-frequency AFM. Oscillation observables of AFM
micro-cantilevers to Van der Waals forces vary with time at particular
separation distances. Correspondingly, quantification of sensitivity to Van der
Waals forces strongly depends on the selected time periods, which can be simply
extracted from forced displacements. In the present study, oscillatory motions
of the AFM micro-cantilevers with different elastic stiffness, effective
masses, and tip radii are obtained for the fundamental eigenmode in monomodal
operations using the lumped parameter model. It is observed that amplitude,
phase shift, and frequency responses mostly exhibit similar behaviors in the
time domain (19.0 – 19.4 ms) for different mechanical features of the
micro-cantilever. The responses of the dynamic model are compared with the
results in the literature, which are determined for an AFM micro-cantilever
under different operating conditions. For instance, the amplitude of 9.05 nm at
19.02 ms and the phase shift of around 96 degrees at 19.08 ms are closer to the
literature results, which are the amplitude of 9.9 nm and the phase shift of 90
degrees in the separation distance
range of 1 - 5 nm, respectively. Therefore, the time dependency of vibration
observables of micro-cantilevers under external forces is to be considered for
enhanced sensitivity analysis.