Anisotropic thermal transport in graphene oxide films

W. Yu1 and H. Xie1

1Shanghai Second Polytechnic University, P.R. China

Keywords: thermal properties
property: thermal conductivity
material: graphene oxide film

Recent experimental results showed that graphene has superior thermal conductivity. It is beneficial for electronic applications. Graphene oxide film (GO film, paper) is a new kind of layered material. It outperforms many other paper-like materials in stiffness and strength, combining the macroscopic flexibility and stiffness of a unique interlocking-tile arrangement of the nanoscale graphene oxide sheets. Little knowledge is available for the thermal transport in graphene oxide films, whose preparation can be readily scaled up and have great potential applications. In this work, the flexible GO film was prepared by a assemble method under a directional flow. The thermophysical properties of the layer film material were investigated. The transient electrothermal technique was used to measure the thermal conductivity along in-plane direction of GO film. The real thermal conductivity along in-plane direction is 1.68-2.21 W/m.K, and the real thermal diffusivity is 1.32-1.57×10-6 m2/s. A modified laser flash technique is developed for the thermal conductivity measurement along cross-plane direction. The real thermal diffusivity along cross-plane direction is only 1.68×10-7 m2/s, about 1 order of magnitude below that along in-plane direction, illustrating the strong anisotropic. It reflects the microscopic layer structure in essence. The following two factors may have great influence on the thermal transport in GO film. One is the thermal contact resistance between the adjacent GO, another is the low thermal conductivity for graphene oxide, which is caused by the lattice defects, it will hinder thermal transport and promote diffusion effect.

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