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Quartz tuning fork-based frequency modulation atomic force spectroscopy and microscopy with all digital phase-locked loop

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7 Author(s)
An, Sangmin ; Center for Nano-Liquid, Department of Physics and Astronomy, Seoul National University, Seoul 151-747, South Korea ; Hong, Mun-heon ; Kim, Jongwoo ; Kwon, Soyoung
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We present a platform for the quartz tuning fork (QTF)-based, frequency modulation atomic force microscopy (FM-AFM) system for quantitative study of the mechanical or topographical properties of nanoscale materials, such as the nano-sized water bridge formed between the quartz tip (∼100 nm curvature) and the mica substrate. A thermally stable, all digital phase-locked loop is used to detect the small frequency shift of the QTF signal resulting from the nanomaterial-mediated interactions. The proposed and demonstrated novel FM-AFM technique provides high experimental sensitivity in the measurement of the viscoelastic forces associated with the confined nano-water meniscus, short response time, and insensitivity to amplitude noise, which are essential for precision dynamic force spectroscopy and microscopy.

Published in:

Review of Scientific Instruments  (Volume:83 ,  Issue: 11 )

Date of Publication:

Nov 2012

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