Layer and size dependence of thermal conductivity in multilayer graphene nanoribbons

TL;DR

This study investigates how the thermal conductivity of multilayer graphene nanoribbons decreases with more layers, due to phonon resonance effects, and aligns with recent experimental findings.

Contribution

It reveals the layer-dependent decrease in thermal conductivity and attributes it to phonon resonance effects using non-equilibrium molecular dynamics.

Findings

Thermal conductivity decreases monotonically with more layers.

Reduction is proportional to layer size.

Results agree with recent experimental data.

Abstract

Using non-equilibrium molecular dynamics method(NEMD), we have found that the thermal conductivity of multilayer graphene nanoribbons monotonously decreases with the increase of the number of layers, such behavior can be attributed to the phonon resonance effect of out-of-plane phonon modes. The reduction of thermal conductivity is found to be proportional to the layer size, which is caused by the increase of phonon resonance. Our results are in agreement with recent experiment on dimensional evolution of thermal conductivity in few layer graphene.