Dynamic stiffness of the contact between a carbon nanotube and a flat substrate in a peeling geometry

Tianjun Li 1 Lorène Champougny 2 Ludovic Bellon 2
1 Key Laboratory of Computer Vision and System (Ministry of Education), Tianjin University of Technology
2 Phys-ENS - Laboratoire de Physique de l'ENS Lyon
Abstract : We study the physics of adhesion and the contact mechanics at the nanoscale with a peeling experiment of a carbon nanotube on a flat substrate. Using an interferometric atomic force microscope and an extended force modulation protocol, we investigate the frequency response of the stiffness of the nano-contact from DC to 20 kHz. We show that this dynamic stiffness is only weakly frequency dependent, increasing by a factor 2 when the frequency grows by 3 orders of magnitude. Such behavior may be the signature of amorphous relaxations during the mechanical solicitation at the nano-scale.
Keywords : nano-mechanics carbon nanotube peeling adhesion contact dynamics dynamic force spectroscopy
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Tianjun Li, Lorène Champougny, Ludovic Bellon. Dynamic stiffness of the contact between a carbon nanotube and a flat substrate in a peeling geometry. Journal of Applied Physics, American Institute of Physics, 2017, 121, pp.094305 ⟨10.1063/1.4977867⟩. ⟨ensl-01399263v2⟩

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