TY  - JOUR
AU  - Ma, T
AU  - Liu, Z
AU  - Wen, J
AU  - Gao, Y
AU  - Ren, X
AU  - Chen, H
AU  - Jin, C
AU  - Ma, X-L
AU  - Xu, N
AU  - Cheng, H-M
AU  - Ren, W
Y2  - 2020/12/18
Y1  - 2017/02/16
SN  - 2041-1723
UR  - http://hdl.handle.net/11343/256002
AB  - 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.
LA  - English
PB  - NATURE PUBLISHING GROUP
T1  - Tailoring the thermal and electrical transport properties of graphene films by grain size engineering
DO  - 10.1038/ncomms14486
IS  - Nature Communications
VL  - 8
IS  - 1
L1  - /bitstream/handle/11343/256002/PMC5316893.pdf?sequence=1&isAllowed=y
ER  -