Measurements of Thermal Conductivity and Thermopower in Suspended Single and Few Layer Graphene

ORAL

Abstract

Detailed study on thermal conductivity and thermopower in suspended single and few layer graphene has been hampered by experimental challenges mainly due to the difficulty of obtaining suspended samples larger than a few micrometers. Here, we report on a high-yield process for the fabrication of suspended graphene samples of one to few atomic layers on micro-thermometer devices, which allow us to investigate electrical and thermal conductivity, and thermopower from 4 K to 500 K. We find that the thermal conductivity values in suspended graphene are largely limited by scattering with surface residues in as-made devices, and they can reach values comparable to those of bulk graphite after thorough cleaning of the sample surfaces. In addition, temperature-dependent thermopower results in suspended graphene are reported.

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Authors

  • Insun Jo

    • Department of Physics, The University of Texas at Austin, Austin, TX78712, USA

  • Michael Pettes

    • Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX78712, USA

  • Zhen Yao

    • Department of Physics, The University of Texas at Austin, Austin, TX78712, USA

  • Li Shi

    • Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX78712, USA