Anomalous friction in suspended graphene

Abstract

Since the discovery of the Amonton's law and with support of modern tribological models, friction between surfaces of three-dimensional materials is known to generally increase when the surfaces are in closer contact. Here, using molecular dynamics simulations of friction force microscopy on suspended graphene, we demonstrate an increase of friction when the scanning tip is retracted away from the sample. We explain the observed behavior and address why this phenomenon has not been observed for isotropic 3-D materials.

References in corpus (2)

• The interlayer cohesive energy of graphite from thermal desorption of polyaromatic hydrocarbons
• The nature and strength of inter-layer binding in graphite

Cited by in corpus (7)

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• Effects of thermal rippling on the frictional properties of free-standing graphene
• Current trends in the physics of nanoscale friction
• Effects of surface compliance and relaxation on the frictional properties of lamellar materials
• Friction and mobility of carbon nanoparticles on a graphene sheet
• Dramatic effect of a transverse electric field on frictional properties of graphene
• Friction on layered media: How deep do phonons reach?