▎ 摘　　要

NOVELTY - Producing a graphene oxide-coated graphitic foil, comprises: (a) preparing a core or substrate layer of a graphitic material; (b) preparing a graphene oxide gel having graphene oxide molecules dispersed in a fluid medium, where graphene oxide gel is optically transparent or translucent; (c) depositing graphene oxide gel onto a surface of the core or substrate layer to form a coating on it; (d) partially or completely removing the fluid medium from the coating to form a coated laminate; and (e) heat-treating the coated substrate or coated laminate to form graphene oxide-coated graphitic foil. USE - The process is useful for producing a graphene oxide-coated graphitic foil (claimed), which is useful in heat dissipation system or thermal management system. ADVANTAGE - The process provides the graphene-coated graphitic foil, which: has a thermal conductivity of greater than or equal to 600 W/mK, preferably 600-1900 W/mK, a physical density of greater than or equal to 1.4 g/cm3, preferably 1.4-2.24 g/cm3, electrical conductivity of 5000-20000 S/cm, and a tensile strength of greater than or equal to 10 MPa, preferably greater than 40-20 MPa and a Rockwell hardness of 60-88 (claimed), hence exhibits improved thermal conductivity, electrical conductivity, mechanical strength, surface scratch resistance and hardness; and exhibits less or no tendency to flake off. DETAILED DESCRIPTION - Producing a graphene oxide-coated graphitic foil, comprises: (a) preparing a core or substrate layer of a graphitic material; (b) preparing a graphene oxide gel having graphene oxide molecules dispersed in a fluid medium, where the graphene oxide gel is optically transparent or translucent; (c) depositing graphene oxide gel onto a surface of the core or substrate layer to form a coating on it; (d) partially or completely removing the fluid medium from the coating to form a coated laminate; and (e) heat-treating the coated substrate or the coated laminate to form the graphene oxide-coated graphitic foil. The graphene oxide coating layer has a thickness of 1 nm to 10 mm, and an oxygen content of 0.01-40 wt.% based on the total graphene oxide weight, and comprises a unitary graphene layer or a single crystal of oriented graphene planes that are parallel to one another. The graphene-coated graphitic foil has a thickness of 10 mu m to 10 mm, a thermal conductivity of greater than or equal to 600 W/mK, a physical density of greater than or equal to 1.4 g/cm3, and a tensile strength of greater than or equal to 10 MPa.