Abstract: The present invention relates to a method of preparing nitrogen-doped graphene, comprising: mixing at least one solid-state nitrogen containing precursor with a graphene to form a mixture, and sintering the mixture under a reducing atmosphere to obtain the nitrogen-doped graphene. The present invention further provides a method of producing a composite heat dispatching plate coated with nitrogen-doped graphene film, comprising: mixing a nitrogen-doped graphene obtained aforementioned with a polymer bonding agent to form a mixture slurry, coating the mixture slurry onto at least one surface of a metal substrate to form a composite material, drying the composite material, and obtaining the composite heat dispatching plate with a film of nitrogen-doped graphene. Structural defects of graphene lattices are reduced during doping process so that crystallinity and thermal conductivity are improved.

Abstract: The present invention relates to a method of preparing nitrogen-doped graphene, comprising: mixing at least one solid-state nitrogen containing precursor with a graphene to form a mixture, and sintering the mixture under a reducing atmosphere to obtain the nitrogen-doped graphene. The present invention further provides a method of producing a composite heat dispatching plate coated with nitrogen-doped graphene film, comprising: mixing a nitrogen-doped graphene obtained aforementioned with a polymer bonding agent to form a mixture slurry, coating the mixture slurry onto at least one surface of a metal substrate to form a composite material, drying the composite material, and obtaining the composite heat dispatching plate with a film of nitrogen-doped graphene. Structural defects of graphene lattices are reduced during doping process so that crystallinity and thermal conductivity are improved.

Abstract: The present invention provides a highly thermal conductive and heat radiation absorptive metal foil with a basis weight of at least 220g/m2 and a metal content of at least 90%. The present invention further provides a composite heat dissipating plate comprising a metal foil having a first surface and an opposite second surface, a basis weight of at least 220g/m2, a metal content of at least 90%, and at least a layer of nitrogen-doped graphene coated on at least one of the first surface and the second surface. At least one of the above-mentioned surfaces has a roughness of 0.19?Ra?0.23 ?m, 1.3?Rt?1.84 ?m and/or 1.02?Rz?1.07 ?m. The metal foil has crystal size between 308 and 434 ?, and a lightness of surface colors of 25<L*<40.