▎ 摘　　要

NOVELTY - Preparing graphene thermal conductive film comprises (i) ultrasonically cleaning a nickel foil with acetone and pure water, and drying with nitrogen; (ii) placing a powdered solid carbon source in crucible, placing nickel foil horizontally at mouth of crucible, pressing a high temperature resistant frame horizontally on the nickel foil, placing the whole body upside down into heating zone of the quartz tube, installing the flanges at both ends of the quartz tube, evacuating to 15-35Pa, filling with inert gas to vacuum, repeating the above operation twice, opening the exhaust valve and feeding the mixed gas of nitrogen and hydrogen, keeping the furnace chamber at vacuum, and heating; (iii) heat preserving for 0.5-8 hours and at lower the temperature when the temperature of furnace rises to 1050-1200℃; and (iv) taking out nickel foil with graphene grown on the surface, corroding the nickel foil with dilute hydrochloric acid, cleaning graphene film with pure water, and drying. USE - The method is useful for preparing graphene thermal conductive film. ADVANTAGE - The method is easy to expand and has great significance for the heat dissipation of microelectronic devices, short production cycle, and low energy consumption, no high-temperature graphitization process is required and solves the problem that the graphene thermal conductive film with a thickness of 250 nm to 10 um is not easy to form. DESCRIPTION OF DRAWING(S) - The drawing shows the structure schematic diagram of the crucible and frame. 1Crucible 2Solid carbon source 3Nickel foil 4High temperature resistant frame