▎ 摘　　要

NOVELTY - Method for preparing graphene or graphite film, involves using a high-temperature substrate, rapidly cooling in a liquid carbon source by quenching under the protection of a gas, and growing graphene or graphite film on the surface of the substrate using cracking of the liquid carbon source during the quenching process. USE - The method is useful for preparing graphene or graphite film used in electronic devices, optoelectronic devices, electrochemical energy storage, anti-corrosion and wear-resistant coatings, high-strength and high-conductivity composite materials, transparent conductive films, electromagnetic shielding electromagnetic shielding thermal management and thermal power application. ADVANTAGE - The method has simple preparation process, high efficiency and excellent controllability, and is economical manner.