Substrate Coupling Suppresses Size Dependence of Thermal Conductivity in Supported Graphene

Abstract

Thermal conductivity $\kappa$ of both suspended and supported graphene has been studied by using molecular dynamics simulations. Obvious length dependence is observed in $\kappa$ of suspended single-layer graphene (SLG), while $\kappa$ of supported SLG is insensitive to the length. The simulation result of room temperature $\kappa$ of supported SLG is in good agreement with experimental value. In contrast to the decrease in $\kappa$ induced by inter-layer interaction in suspended few-layer graphene (FLG), $\kappa$ of supported FLG is found to increase rapidly with the layer thickness, reaching about 90% of that of bulk graphite at six layers, and eventually saturates at the thickness of 13.4 nm. More interestingly, unlike the remarkable substrate dependent $\kappa$ in SLG, the effect of substrate on thermal transport is much weaker in FLG. The underlying physics is investigated and presented.

18 pages with 4 figures in paper, plus 7 pages with 2 figures in supplementary material

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• Significant Reduction of Graphene Thermal Conductivity by Phononic Crystal Structure
• Generalized two-temperature model for coupled phonons
• Photo-Nernst current in graphene
• Manipulate Temperature Dependence of Thermal Conductivity of Graphene Phononic Crystal
• Nanoscale Graphene Disk: A Natural Functionally Graded Material --The Thermal Conductivity of Nanoscale Graphene Disk by Molecular Dynamics Simulation
• Diffusive nature of thermal transport in stanene
• Hexagonal Boron Nitride-Graphene Heterostructures with Enhanced Interfacial Thermal Conductance for Thermal Management Applications
• Thermal and electronic transport characteristics of highly stretchable graphene kirigami
• Graphene Helicoid: The Distinct Properties Promote Application of Graphene Related Materials in Thermal Management
• Low Thermal Conductivity and Interface Thermal Conductance in SnS2
• Thermal transport in MoS2/Graphene hybrid nanosheets
• Chemical-Vapor-Deposited Graphene as a Thermally Conducting Coating
• Phonon anharmonicity and thermal conductivity of two-dimensional van der Waals materials: A review
• Size Dependence and Ballistic Limits of Thermal Transport in Anisotropic Layered Two-Dimensional Materials