Volume 62, Number 5, June 2003
|Page(s)||671 - 676|
|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: email@example.com
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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