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Phonon-interface scattering in multilayer graphene on an amorphous support.

Mir Mohammad Sadeghi¹, Insun Jo, Li Shi

¹Department of Mechanical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712.

Proceedings of the National Academy of Sciences of the United States of America

|September 27, 2013

Summary

This summary is machine-generated.

Multilayer graphene (MLG) on amorphous silicon dioxide shows suppressed thermal conductivity even at 34 layers. Phonon scattering at the interface limits heat transfer, suggesting support material choice is key for improving MLG thermal performance.

Keywords:

boundary scattering nanoscale thermal transport phonon transport thermal management two-dimensional materials

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Area of Science:

Materials Science
Condensed Matter Physics
Nanotechnology

Background:

Two-dimensional (2D) phonon physics in graphene is crucial for device performance.
Understanding thermal conductivity suppression in supported graphene is an open question.

Purpose of the Study:

Investigate the layer thickness required for supported multilayer graphene (MLG) to achieve graphite's thermal conductivity.
Identify the causes of suppressed basal-plane thermal conductivity in graphene on amorphous materials.

Main Methods:

Sensitive in-plane thermal transport measurements of graphene on amorphous silicon dioxide.
Application of an interface scattering model for anisotropic materials.

Main Results:

Full recovery of thermal conductivity to that of natural graphite was not observed even with 34 layers of MLG.
Long phonon scattering mean free paths and diffuse interface scattering contribute to suppressed thermal conductivity.
Phonon transmission coefficient calculations revealed significant scattering at the MLG-amorphous support interface.

Conclusions:

Supported MLG's thermal conductivity is limited by interface scattering, even for thick layers.
Rational selection of support materials offers a potential strategy to enhance the thermal conductivity of supported MLG.