Issue |
Europhys. Lett.
Volume 62, Number 5, June 2003
|
|
---|---|---|
Page(s) | 671 - 676 | |
Section | General | |
DOI | https://doi.org/10.1209/epl/i2003-00426-2 | |
Published online | 01 May 2003 |
Apparent hardening of soft samples through
factor change
in AFM
CPMOH University Bordeaux I - 351 Cours de la Libération, F-33405 Talence, France
Corresponding author: jp.aime@cpmoh.u-bordeaux1.fr
Received:
18
November
2002
Accepted:
21
March
2003
This experimental work aims to show that the Q factor value is an experimental parameter of great importance to access different soft materials properties with a dynamic Atomic Force Microscope. Two dynamic modes have been compared, amplitude modulation, usually called Tapping mode, and the frequency modulation mode. With Tapping, at low or intermediate Q values, the images mostly contain mechanical information. At very high Q values, more than 104, obtained in a vacuum, the experiments performed on a polyisoprene sample show that a pure topographic image can be recorded with Tapping, but not with frequency modulation. For large enough Q values, even on a very soft sample, images in which only topographic information is revealed can be obtained and are in agreement with theoretical predictions.
PACS: 07.79.Lh – Atomic force microscopes / 68.37.Ps – Atomic force microscopy (AFM) / 87.64.Dz – Scanning tunneling and atomic force microscopy
© EDP Sciences, 2003
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