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

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 elect

SUBMITTER: Ma T 

PROVIDER: S-EPMC5316893 | biostudies-literature | 2017 Feb

REPOSITORIES: biostudies-literature