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Peak forces and lateral resolution in amplitude modulation force microscopy in liquid

AuthorsVargas Guzmán, Horacio Andrés ; García García, Ricardo
KeywordsPeak force l
Lateral resolution
Force microscopy
Issue Date2013
PublisherBeilstein-Institut zur Förderung der Chemischen Wissenschaften
CitationBeilstein Journal of Organic Chemistry 4: 852-859 (2013)
AbstractThe peak forces exerted on soft and rigid samples by a force microscope have been modeled by performing numerical simulations of the tip motion in liquid. The forces are obtained by using two contact mechanics models, Hertz and Tatara. We present a comparison between the numerical simulations and three analytical models for a wide variety of probe and operational parameters. In general, the forces derived from analytical expressions are not in good quantitative agreement with the simulations when the Young modulus and the set-point amplitude are varied. The only exception is the parametrized approximation that matches the results given by Hertz contact mechanics for soft materials and small free amplitudes. We also study the elastic deformation of the sample as a function of the imaging conditions for materials with a Young modulus between 25 MPa and 2 GPa. High lateral resolution images are predicted by using both small free amplitudes (less than 2 nm for soft materials) and high set-point amplitudes. © 2013 Guzman and Garcia.
DescriptionThis is an Open Access article under the terms of the Creative Commons Attribution License.
Publisher version (URL)http://dx.doi.org/10.3762/bjnano.4.96
Identifiersdoi: 10.3762/bjnano.4.96
issn: 1860-5397
Appears in Collections:(ICMM) Artículos
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