High-performance graphene heat-conducting film and preparation method thereof

The invention discloses a high-performance graphene heat-conducting film and a preparation method thereof, in the method provided by the invention, polyimide molecules are used as bridges to connect adjacent graphene oxide sheets, and a catalyst is added to reduce the activation energy of conversion from amorphous carbon to crystalline carbon, so that the temperature required by graphitization can be reduced. According to the invention, the graphene sheet provides a heat transfer space for phonons, and the addition of the catalyst is beneficial to the formation of a graphite crystal structure, so that the crystal structure of the graphene is more compact and ordered, the structural defects can be effectively repaired, and graphitization can be realized at a lower temperature or the graphitization degree can be improved at the same temperature; and pyridine is beneficial to improving the graphitization degree of polyimide, reducing the graphite spacing and forming polyimide with a highly oriented structure, an