Atomic scale friction between clean graphite surfaces

TL;DR

This study uses molecular dynamics simulations to explore atomic-scale friction between clean graphite surfaces, revealing that the honeycomb structure significantly contributes to low friction, beyond just weak interlayer forces.

Contribution

It demonstrates that the honeycomb structure of graphite layers is a key factor in low friction, providing new insight beyond previous assumptions about interlayer interactions.

Findings

Simulation reproduces atomic stick-slip motion.

Low friction is primarily due to honeycomb structure.

Results align with experimental observations.

Abstract

We investigate atomic scale friction between clean graphite surfaces by using molecular dynamics. The simulation reproduces atomic scale stick-slip motion and low frictional coefficient, both of which are observed in experiments using frictional force microscope. It is made clear that the microscopic origin of low frictional coefficients of graphite lies on the honeycomb structure in each layer, not only on the weak interlayer interaction as believed so far.