Contact resonance atomic force microscopy imaging in air and water using photothermal excitation

The Review of Scientific Instruments
Marta KocunR Proksch

Abstract

Contact Resonance Force Microscopy (CR-FM) is a leading atomic force microscopy technique for measuring viscoelastic nano-mechanical properties. Conventional piezo-excited CR-FM measurements have been limited to imaging in air, since the "forest of peaks" frequency response associated with acoustic excitation methods effectively masks the true cantilever resonance. Using photothermal excitation results in clean contact, resonance spectra that closely match the ideal frequency response of the cantilever, allowing unambiguous and simple resonance frequency and quality factor measurements in air and liquids alike. This extends the capabilities of CR-FM to biologically relevant and other soft samples in liquid environments. We demonstrate CR-FM in air and water on both stiff silicon/titanium samples and softer polystyrene-polyethylene-polypropylene polymer samples with the quantitative moduli having very good agreement between expected and measured values.

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Citations

Jul 23, 2015·Advanced Healthcare Materials·Jason I KilpatrickBrian J Rodriguez
Oct 2, 2015·Langmuir : the ACS Journal of Surfaces and Colloids·Allison B ChurnsideJason P Killgore
Jul 8, 2017·Scientific Reports·Naikun GaoDuo Liu
Mar 6, 2019·The Review of Scientific Instruments·Francisco Javier Flores-Ruiz, Valentin Garcia-Vazquez
Jan 14, 2017·Nanotechnology·Ryan Wagner, Jason Killgore
Jul 11, 2019·Small Methods·Callie I Fiedler-HigginsJason P Killgore
Aug 19, 2020·ACS Applied Materials & Interfaces·Sabine NeumayerNina Balke

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