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Dependence of the In-Plane Thermal Conductivity of Graphene on Grain Misorientation

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    Dependence of the In-Plane Thermal Conductivity of Graphene on Grain Misorientation
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    † Institute of Advanced Machinery and Technology, Sungkyunkwan University, Suwon 16419, Republic of Korea
    ‡ Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
    § School of Advanced Material Science and Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
    ⊥ School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Republic of Korea
    ∥ Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS), Suwon 16419, Republic of Korea
    *Ji Won Suk. E-mail: [email protected]
    *Seunghyun Baik. E-mail: [email protected]
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    Chemistry of Materials

    Cite this: Chem. Mater. 2017, 29, 24, 10409–10417
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    https://doi.org/10.1021/acs.chemmater.7b03821
    Published December 4, 2017
    Copyright © 2017 American Chemical Society
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    Abstract

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    The thermal transport across the grain boundary (GB) is inevitably encountered for large-area polycrystalline graphene. However, the influence of GB configuration on thermal transport is not well understood. Here we investigated the effect of grain misorientation angle on the in-plane thermal conductivity (κ) of suspended graphene by using the optothermal Raman technique. Graphene with well-defined grain orientation was synthesized on an electropolished, annealed, and oxygen plasma-treated single-crystalline Cu(111) substrate by low-pressure chemical vapor deposition. The κ was primarily dependent on the grain size of single-, bi-, and polycrystalline graphene, consistent with the Boltzmann transport model. Surprisingly, κ of bicrystalline graphene dramatically decreased with a slight misorientation (<4°) between two neighboring grains. This phonon-boundary scattering was successfully simulated by the GB misorientation model. The GB length or shape also affected κ as a tertiary parameter. The GB misorientation angle and length, in addition to the grain size, were determining factors of κ, which may be applicable for other two-dimensional materials.

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    Supporting Information

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.chemmater.7b03821.

    • Additional Raman spectra and SAED patterns of the suspended graphene membranes, the integral factor (α) calculation, and parameters used for the thermal conductivity calculation (PDF)

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    Chemistry of Materials

    Cite this: Chem. Mater. 2017, 29, 24, 10409–10417
    Click to copy citationCitation copied!
    https://doi.org/10.1021/acs.chemmater.7b03821
    Published December 4, 2017
    Copyright © 2017 American Chemical Society
    Request reuse permissions

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