Study Of The Thermal Conductivity Of Graphite Film

Graphite is a good conductor of heat, with high thermal conductivity, is considered an ideal alternative to metal. In this paper, the thermal properties of graphite materials were studied, and different theoretical models for thermal conductivity of different thickness of graphite materials have been established.(1) The home-made graphite films have been characterized by the method of XRD,SEM and HRTEM in the dimensions of microns and nanometers. The degrees of graphitization of the graphite films were obtained.(2) In this paper, the thermal conductivity of graphite film in the range of temperature 90 K ? 350Kwas analyzed. The relationship between the thermal conductivity of the graphite film and the temperature was obtained. And the phonon boundary scattering effect on the size effect has been discussed.(3) Based on the Boltzmann transport theory, the theoretical values of in-plane conductivity in bilayer graphene films are computed. The size effect of thermal conductivity in thin films could be attributed to the diminishing of relaxtion time or mean free path of phonons (lattice vibration) in films. The relationship between the thermal conductivity of the graphite film with the temperature and the Gruneisen parameter was obtained.