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Amplitude calibration of the quartz tuning fork (QTF) sensor includes the measurement of the sensitivity factor (αTF). We propose, AFM based methods (cantilever tracking and z-servo tracking of the QTF's amplitude of vibration) to determine the sensitivity factor of the QTF. The QTF is mounted on a xyz-scanner of the AFM and a soft AFM probe is approached on the apex of a tine of the QTF by driving...
This paper presents an easy-to-use and efficient implementation of the added mass method for calibrating various atomic force microscope (AFM) probes without damage to the probe, which is based on the added mass method. The method is achieved by using a pneumatic control system and a home-made glass micro-pipette. Compared with the conventional added mass method, this method achieves the operation...
A force sensor in the heart of an atomic force microscope (AFM) plays a key role in the AFM measurements. Quartz tuning fork (QTF) based force sensor is attracting huge attention due to its peculiar traits such as self-actuating and sensing capability, high quality factor and high force sensitivity. Unfortunately, mounting a tip on a tine of the QTF degrades its quality (Q)-factor and sensitivity...
The atomic force microscope (AFM) has been widely used as a nano-effector with a function of force sensing to detect interaction forces between an AFM tip and a sample, thereby controlling the process of the nanomanipulation. However, both the extent and accuracy of force application are significantly limited by the nonlinearity of the commonly used optical lever with a nonlinear position-sensitive...
Using higher resonant modes of microcantilevers promises higher sensitivity in the bio/chemical molecular detection. Compared with the first flexure modes, the first torsional mode can provide an improved mass-sensing resolution due to the higher quality factor. For the accurate characterization of the torsional mode and further detection of the multi-mass attached to the microcantilevers, models...
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