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Theses

Propriétés électromécaniques des nanotubes de carbone multiparois

Abstract : In this PhD thesis, we tackled theoretically and experimentally the problem of designing nanoelectromechanical systems (NEMS) based on multiwalled carbon nanotubes (MWCNTs). Furthermore, we applied our know-how to perform components like switches.
We developed a theoretical model to describe the deflection of a suspended MWCNT stressed by an attractive electrostatic force. Our model highlights a scaling law linking up the electrostatic deflection, geometrical, electrical and physical parameters of MWCNTs based NEMS. This result constitutes a practical designing tool because it predicts their electromechanical behaviour on a "large" range of operational parameters.
At the same time, we developed several processes to fabricate nanostructures incorporating a suspended MWCNT electrostatically actuated. Among these different structures, the simplest was used to develop a method for probing electromechanical properties of MWCNTs. Our method is based on atomic force microscopy measurements on a doubly clamped suspended MWCNT electrostatically deflected by a drive voltage. These measurements show clearly for different MWCNTs (different diameter and length) the existence of such scaling law in agreement with the continuum model prediction. From these results, we extracted the Young's modulus of MWCNTs. For diameters smaller than 30 nm it is constant and its average value equals 400 GPa. Above, we observed a strong decrease that could be explained by the entry in a non-linear regime of deformation.
Finally, we show the realization of an electromechanical switch based on a suspended MWCNT which presents good switching behaviour.
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Theses
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https://tel.archives-ouvertes.fr/tel-00012207
Contributor : Roland Lefevre <>
Submitted on : Thursday, May 4, 2006 - 5:26:25 PM
Last modification on : Friday, September 11, 2015 - 9:58:24 AM
Long-term archiving on: : Monday, September 17, 2012 - 2:05:18 PM

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  • HAL Id : tel-00012207, version 1

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Roland Lefevre. Propriétés électromécaniques des nanotubes de carbone multiparois. Physique [physics]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00012207⟩

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