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

Teng Ma, Zhibo Liu, Jinxiu Wen, Yang Gao, Xibiao Ren, Huanjun Chen, Chuanhong Jin, Xiu-Liang Ma, Ningsheng Xu, Hui-Ming Cheng () and Wencai Ren ()
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Teng Ma: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Zhibo Liu: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Jinxiu Wen: State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Physics and Engineering, Sun Yat-sen University
Yang Gao: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Xibiao Ren: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Huanjun Chen: State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Physics and Engineering, Sun Yat-sen University
Chuanhong Jin: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Xiu-Liang Ma: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Ningsheng Xu: State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology, School of Physics and Engineering, Sun Yat-sen University
Hui-Ming Cheng: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences
Wencai Ren: Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: 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.

Date: 2017
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DOI: 10.1038/ncomms14486

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