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Mapping surface elastic properties of stiff and compliant materials on the nanoscale using ultrasonic force microscopy

Dinelli, F. and Castell, M. R. and Ritchie, D. A. and Mason, N. J. and Briggs, G. Andrew D. and Kolosov, Oleg (2000) Mapping surface elastic properties of stiff and compliant materials on the nanoscale using ultrasonic force microscopy. Philosophical magazine a-Physics of condensed matter structure defects and mechanical properties, 80 (10). pp. 2299-2323. ISSN 0141-8610

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Abstract

The increasing production of nano-devices and nano-composite materials has prompted the development of new instruments to probe smaller and smaller volumes. Regarding mechanical properties in particular, modified atomic force microscopes using force modulation at frequencies below the cantilever resonance have been successfully employed to investigate relatively compliant materials such as bio-materials and polymers but have shown limitations to highly stiff materials. The alternative approach of ultrasonic force microscopy (UFM) uses sample vibration at frequencies far above the cantilever primary resonance, exploiting the inertial stiffness of an atomic force microscopy cantilever and detection of ultrasonic vibration via nonlinearity of the tip-surface force interaction. In this paper we demonstrate that UFM can discriminate elastic properties of materials ranging from quite stiff to relatively compliant with a lateral resolution of a few nanometres and with high sensitivity to the elastic modulus. Furthermore a phenomenon of ultrasonically induced friction reduction permits imaging of fragile samples otherwise swept away in conventional contact mode atomic force microscopes. The possible influence of adhesive properties also has been analysed and criteria for distinguishing elastic and adhesive contributions have been established. We also explore another promising application of UFM for detection of nanoscale subsurface delamination.

Item Type: Article
Journal or Publication Title: Philosophical magazine a-Physics of condensed matter structure defects and mechanical properties
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 57445
Deposited By: ep_importer_pure
Deposited On: 09 Oct 2012 13:16
Refereed?: Yes
Published?: Published
Last Modified: 10 Apr 2014 00:01
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/57445

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