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Propriétés mécaniques des nanotubes de carbone en tant que nanosondes et leur fonctionnalisation par bio-nanoparticules

Abstract : Carbon nanotube fixation at an AFM tip apex forms one of the best approaches to improve local force probes. We present here a comparative study of carbon nanotubes obtained by chemical vapor deposition either into simple or double walls (typical diameter of about 2 at 4 nm) or in multiple walls (diameter of about 70 nm) welded onto the tip. The study of the mechanical properties of nanotubes, made in dynamic frequency modulation AFM, shows the competition between adhesion of the tube on the sample and elastic energy stored during its distortion. As a nanoprobe, carbon nanotube presents many advantages and, with a specific functionalization, can even become a probe well adapted for studying biological systems. We propose here a measurement method of the specific recognition between a peptide and a non biological material in order to consider thereafter the AFM tips functionalization. This method exploits nanoparticles functionalized with sequences of amino acids, synthesized from results of biological molecular approach. These peptide sequences will then be fixed on an AFM tip, on which is grafted a carbon nanotube or on a tip carved with a focused ion beam. The functionalization is realized by dipping, using a dynamic AFM, an oscillating tip in a solution of diluted nanoparticles. Measurements of frequency shifts and dissipation can explain how the nanoparticles interact with the tip.
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https://tel.archives-ouvertes.fr/tel-00250046
Contributor : Charlotte Bernard <>
Submitted on : Friday, February 8, 2008 - 6:04:12 PM
Last modification on : Monday, January 22, 2018 - 11:02:01 AM
Long-term archiving on: : Monday, May 17, 2010 - 7:59:23 PM

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Charlotte Bernard. Propriétés mécaniques des nanotubes de carbone en tant que nanosondes et leur fonctionnalisation par bio-nanoparticules. Physique [physics]. Université Sciences et Technologies - Bordeaux I, 2007. Français. ⟨tel-00250046⟩

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