▎ 摘　　要

NOVELTY - Preparing heat-conducting graphene heat-dissipating film with adjustable thickness, involves (a) uniformly mixing graphene oxide with deionized water, uniformly stirring and dispersing, adding dopant after the initial stirring viscosity of the mixture increases to 10000 mPa.second, after completing the dispersion, adjusting the pH value and increasing the viscosity of mixture, (b) coating obtained graphene oxide slurry and drying in coating manner to obtain film, (c) pretreating obtained graphene oxide film at 60-300 degrees C, removing partial oxygen-containing group, and increasing the carbon oxygen ratio of graphene oxide film to obtain pretreated graphene oxide film, (d) adding pretreated graphene oxide film to high-temperature graphite furnace, heating, and maintaining vacuum or inert gas protection in whole process to obtain expanded graphene heat dissipation film, and (e) pressing expanded graphene heat dissipation film to density of 1.6-2.2 g/cm3 using calender. USE - The method is used for preparing heat-conducting graphene heat-dissipating film with adjustable thickness (claimed). ADVANTAGE - The method reduces the viscosity of system by destroying hydrogen bond between graphene oxide through addition of dopant, ensures graphene oxide slurry with high solid content (415%) and moderate viscosity (3.15 million mPa.second), and ensures graphene thermal radiation film with thickness of 10500 microns, density of 1.62.2 g/cm3 and thermal conductivity of more than 1000W/m.K. DETAILED DESCRIPTION - Method for preparing heat-conducting graphene heat-dissipating film with adjustable thickness, involves (a) uniformly mixing 4-15 pts. wt. graphene oxide with 84-95.9 pts. wt. deionized water, uniformly stirring and dispersing, adding 0.1-1 pt. wt. dopant after the initial stirring viscosity of the mixture increases to 10000 mPa.second, after completing the dispersion, adjusting the pH value of mixture to more than 7, and increasing the viscosity of mixture to greater than or equal to 3 mPa.second to obtain graphene oxide slurry, (b) coating obtained graphene oxide slurry and drying in coating manner to obtain film, where the thickness of graphene oxide film is 15-2500 mu m, (c) pretreating obtained graphene oxide film at 60-300 degrees C, removing partial oxygen-containing group, and increasing the carbon oxygen ratio of graphene oxide film to more than 4 to obtain pretreated graphene oxide film, (d) adding pretreated graphene oxide film to high-temperature graphite furnace, heating at 1700-3000 degrees C using gradient, and maintaining vacuum or inert gas protection in whole process to obtain expanded graphene heat dissipation film, and (e) pressing expanded graphene heat dissipation film to density of 1.6-2.2 g/cm3 using calender to obtain heat-conducting graphene heat-dissipating film with adjustable thickness.