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Nanoscale Friction of Graphene

Published online by Cambridge University Press:  02 July 2018

F. Ptak
Affiliation:
Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Marquês de São Vicente 225, Rio de Janeiro, 22453-900, Brazil
C. M. Almeida
Affiliation:
Divisão de Metrologia de Materiais, Instituto Nacional de Metrologia, Normalização e Qualidade Industrial (INMETRO), Duque de Caxias, Rio de Janeiro, 22250-000, Brazil
R. Prioli*
Affiliation:
Departamento de Física, Pontifícia Universidade Católica do Rio de Janeiro, Marquês de São Vicente 225, Rio de Janeiro, 22453-900, Brazil
*
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Abstract

Despite being one of the oldest phenomena known to mankind and its vast use, there still are open questions about the frictional process between two surfaces, especially at the nanometer scale, such as the energy dissipation mechanism, the influence of the crystallographic orientation and the correlation between macroscopic and microscopic scales. In this work, we analyze the interaction between a sharp tip and graphene by friction force microscopy. The graphene surface roughness and adhesion forces with the microscope tip were measured. Neither roughness nor adhesion were observed to influence the friction forces. The scanning velocity dependence of friction was also measured for a different number of layers. The friction forces were observed to increase with the scanning velocity until a critical velocity is achieved by which we have estimated the effective interaction potential between the tip and the graphene surface.

Type
Articles
Copyright
Copyright © Materials Research Society 2018 

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