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Theses
Physique Interfeuillet dans les Nanotubes de Carbone Multifeuillets
Physique Interfeuillet dans les Nanotubes de Carbone Multifeuillets
Abstract : This thesis is devoted to the experimental study of electronic and mechanical properties of multiwalled carbon nanotubes. This implies to find some methods to measure the current in inner shells or probe the intershell electronic/mechanical properties. However, the acces to these informations remains difficult because electrodes are in direct contact only with the outer shell. In the linear regime, at low bias, four points resistance measurements show that essentially two shells contribute to conduction and enable the first determination of the intershell conductance. At high bias a technique allowing to remove individual shell one by one reveals that most of the shells are now carrying a saturation current between 10 and 60 microamps depending on their geometry. This shows a weak variation of the number of current carrying modes, in good agreement with a model including a Zener tunneling effect between non-crossed subbands. Finally this technique is used to measure the mechanical friction between two rotating shells. To that end, a novel type of nano-electromechanical system has been fabricated which represents the first step toward the realisation of a nano-motor.
https://tel.archives-ouvertes.fr/tel-00011132
Contributor : Bertrand Bourlon <>
Submitted on : Thursday, December 22, 2005 - 6:07:47 PM
Last modification on : Monday, December 14, 2020 - 9:41:18 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 4:21:07 PM
Contributor : Bertrand Bourlon <>
Submitted on : Thursday, December 22, 2005 - 6:07:47 PM
Last modification on : Monday, December 14, 2020 - 9:41:18 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 4:21:07 PM