Structure-mediated thermal transport of monolayer graphene allotropes nanoribbons

HF Zhan and YY Zhang and JM Bell and YW Mai and YT Gu, CARBON, 77, 416-423 (2014).

DOI: 10.1016/j.carbon.2014.05.045

We report the study of the thermal transport management of monolayer graphene allotrope nanoribbons (size similar to 20 x 4 nm(2)) by the modulation of their structures via molecular dynamics simulations. The thermal conductivity of graphyne (GY)-like geometries is observed to decrease monotonously with increasing number of acetylenic linkages between adjacent hexagons. Strikingly, by incorporating those GY or GY- like structures, the thermal performance of graphene can be effectively engineered. The resulting hetero-junctions possess a sharp local temperature jump at the interface, and show a much lower effective thermal conductivity due to the enhanced phonon-phonon scattering. More importantly, by controlling the percentage, type and distribution pattern of the GY or GY-like structures, the hetero-junctions are found to exhibit tunable thermal transport properties (including the effective thermal conductivity, interfacial thermal resistance and rectification). This study provides a heuristic guideline to manipulate the thermal properties of 2D carbon networks, ideal for application in thermoelectric devices with strongly suppressed thermal conductivity. (C) 2014 Elsevier Ltd. All rights reserved.

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