▎ 摘　　要

NOVELTY - Preparing graphene micro-nano cavity superconducting film, involves mixing graphene oxide with a solvent to prepare graphene oxide slurry. The graphene oxide slurry is mixed with a liquid low-freezing material to obtain a mixture. The graphene oxide composite membrane is prepared from the mixture under solidification temperature of the low-solidification material is lower than that of the low-solidification material. The temperature is raised to remove the low-solidification material in the graphene oxide composite membrane to obtain the graphene oxide membrane from which the low-solidification material is removed. The graphene oxide film is carbonized and graphitized without the low-solidification material. USE - Method for preparing graphene micro-nano cavity superconducting film used as a thermal interface material, a heat-conducting phase-change material or a shielding buffer material, or in preparing a graphene micro-nano cavity phase-change temperature-uniforming plate used in energy sources, and heat dissipation (all claimed). ADVANTAGE - The graphene micro-nano-cavity superconducting film has thermal conductivity of greater than 50 W/mK, shielding efficiency of more than 80 dB in the electromagnetic wave range of 1-10 GHz, and the compression ratio of greater than 50%, and conductivity of greater than 3 .0×105 S/m. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing graphene micro-nano cavity phase change temperature-uniforming plate, which involves: placing the graphene micro-nano cavity superconducting film in a vacuum environment, and exhausting the internal air; heating and melting the phase change material to obtain a liquid phase change material; heating the graphene micro-nano cavity superconducting film discharging the internal air to a temperature higher than the melting point of the phase change material, then immersing the graphene micro-nano cavity superconducting film into the liquid phase change material, and taking out the graphene micro-nano cavity superconducting film after the liquid phase change material is filled in the graphene micro-nano cavity superconducting film; carrying out suspension draining treatment on the graphene micro-nano cavity superconducting film filled with the phase change material; reducing the temperature of the graphene micro-nano cavity superconducting film subjected to suspension draining treatment to be below the melting point of the phase-change material, so that the liquid phase-change material is solidified.