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    Tailoring the thermal and electrical transport properties of graphene films by grain size engineering

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    Author
    Ma, T; Liu, Z; Wen, J; Gao, Y; Ren, X; Chen, H; Jin, C; Ma, X-L; Xu, N; Cheng, H-M; ...
    Date
    2017-02-16
    Source Title
    Nature Communications
    Publisher
    NATURE PUBLISHING GROUP
    University of Melbourne Author/s
    Gao, Yang
    Affiliation
    Electrical and Electronic Engineering
    Metadata
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    Document Type
    Journal Article
    Citations
    Ma, T., Liu, Z., Wen, J., Gao, Y., Ren, X., Chen, H., Jin, C., Ma, X. -L., Xu, N., Cheng, H. -M. & Ren, W. (2017). Tailoring the thermal and electrical transport properties of graphene films by grain size engineering. NATURE COMMUNICATIONS, 8 (1), https://doi.org/10.1038/ncomms14486.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/256002
    DOI
    10.1038/ncomms14486
    Abstract
    Understanding the influence of grain boundaries (GBs) on the electrical and thermal transport properties of graphene films is essentially important for electronic, optoelectronic and thermoelectric applications. Here we report a segregation-adsorption chemical vapour deposition method to grow well-stitched high-quality monolayer graphene films with a tunable uniform grain size from ∼200 nm to ∼1 μm, by using a Pt substrate with medium carbon solubility, which enables the determination of the scaling laws of thermal and electrical conductivities as a function of grain size. We found that the thermal conductivity of graphene films dramatically decreases with decreasing grain size by a small thermal boundary conductance of ∼3.8 × 109 W m-2 K-1, while the electrical conductivity slowly decreases with an extraordinarily small GB transport gap of ∼0.01 eV and resistivity of ∼0.3 kΩ μm. Moreover, the changes in both the thermal and electrical conductivities with grain size change are greater than those of typical semiconducting thermoelectric materials.

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