▎ 摘　　要

NOVELTY - A graphene is oxidized to obtain graphene oxide. The obtained graphene oxide is dispersed into water to form graphene oxide dispersion solution. The graphene oxide is then reduced, and obtained reduced graphene oxide dispersion solution is then added to a salt solution to form a graphene film at the interface between air and water. USE - Manufacture of large surface area graphene film. ADVANTAGE - The method efficiently and economically provides large surface area graphene film by simple method in short period of time.