Thermal conductivity of penta-graphene: The role of chemical functionalization

Abstract

Penta-graphene (PG) has recently been identified as a novel two-dimensional carbon allotrope comprising entirely of pure pentagons and possessing many unique properties beyond graphene. Herein we investigate the thermal conductivity of hydrogenated and oxidized PGs at different levels of coverage by using non-equilibrium molecular dynamics simulations. Our simulation results show that the oxidized PG possesses a higher thermal conductivity than the hydrogenated counterpart at the same coverage. Interestingly, both functionalized PGs exhibit an unusual down-and-up trend in the thermal conductivity with the increase of coverage level, and the fully functionalized PGs (at 100% coverage) possess almost the same thermal conductivity as the pristine PG. We further explore the underlying mechanisms for the coverage-dependent thermal conduction. Our work provides important insights into the effect of chemical functionalization on the thermal conductivity of this new carbon allotrope.