▎ 摘　　要

NOVELTY - The graphene oxide-coated graphitic foil comprises a graphitic substrate or core layer having two opposed primary surfaces and a graphene oxide coating layer deposited on each of the two primary surfaces. The graphene oxide coating layer has an oxygen content of 0.01-40 wt.%, and is produced from thermal conversion of a graphene oxide gel. The graphitic substrate layer or graphene oxide coating layer has a thickness of less than 100 mu m. The graphene oxide coating comprises a unitary graphene layer or a single crystal of graphene planes obtained from a heat treatment of a graphene oxide gel. USE - The foil is useful in a graphene oxide-coated graphitic structure (claimed) that is useful as a heat spreader. ADVANTAGE - The foil has high thermal and electrical conductivity, increased mechanical strength, improved surface scratch resistance, and enhanced hardness. DETAILED DESCRIPTION - The graphene oxide-coated graphitic foil comprises a graphitic substrate or core layer having two opposed primary surfaces and a graphene oxide coating layer deposited on each of the two primary surfaces. The graphene oxide coating layer has an oxygen content of 0.01-40 wt.%, and is produced from thermal conversion of a graphene oxide gel. The graphitic substrate layer or graphene oxide coating layer has a thickness of less than 100 mu m. The graphene oxide coating comprises a unitary graphene layer or a single crystal of graphene planes obtained from a heat treatment of a graphene oxide gel. The unitary graphene layer or single crystal has a lateral dimension of greater than 100 mu m. The graphitic substrate or core layer comprises flexible graphite foil produced by re-compression of exfoliated graphite worms or exfoliated graphite flakes of natural graphite and/or artificial graphite, and a graphene film comprising a single-layer graphene sheet or a multiple-layer graphene platelet having less than 100 graphene planes. The multi-layer graphene sheet has a thickness of 6.7-20 nm. The graphene oxide coating is obtained by depositing the graphene oxide gel to form a graphene oxide gel coating on a primary surface of the graphitic core or substrate and removing a residual liquid from the coating, subjecting the graphene-oxide to a heat treatment temperature of 1500-2500 degrees C for re-graphitization, and forms into a unitary structure after a re-graphitization treatment. The graphene oxide-coated graphitic foil has a Rockwell hardness value of greater than 60, a thermal conductivity of greater than 1500 Wm-1K-1, an electrical conductivity of greater than 5000 S/cm, a physical density of greater than 2 g/cm3, and a tensile strength of greater than 60 MPa. INDEPENDENT CLAIMS are included for: (1) a graphene oxide-coated graphitic structure; and (2) a process for producing a graphene oxide-coated graphitic foil. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of a method for forming a graphene single crystal.