Manipulate Temperature Dependence of Thermal Conductivity of Graphene Phononic Crystal

TL;DR

This study uses molecular dynamics simulations to show how the thermal conductivity of graphene phononic crystals can be tuned by altering their size, affecting their temperature dependence for potential thermal management applications.

Contribution

It demonstrates that the temperature dependence of thermal conductivity in GPnCs can be effectively controlled by adjusting the characteristic size of the holes, revealing a new way to manipulate heat flow.

Findings

Thermal conductivity follows a $T^{- ext{alpha}}$ behavior.

The power exponent $ ext{alpha}$ can be tuned by changing GPnC size.

Long-range phonon modes are more affected by larger hole sizes.

Abstract

By using non-equilibrium molecular dynamics simulations(NEMD), the modulation on temperature dependence of thermal conductivity of graphene phononic crystals (GPnCs) are investigated. It is found that the temperature dependence of thermal conductivity of GPnCs follows $T^{-\alpha}$ behavior. The power exponents ($\alpha$) can be efficiently tuned by changing the characteristic size of GPnCs. The phonon participation ratio spectra and dispersion relation reveal that the long-range phonon modes are more affected in GPnCs with larger size of holes ($L_0$). Our results suggest that constructing GPnCs is an effective method to manipulate the temperature dependence of thermal conductivity of graphene, which would be beneficial for developing GPnCs-based thermal management and signal processing devices.