Preparation method of double-layer graphene films

The invention discloses a preparation method of double-layer graphene films, which belongs to the technical field of film materials. A catalyst promoter is coated on a cleaned metal foil by spin coating, and then, by using a chemical vapor deposition method, a double-layer graphene film is obtained on the metal foil. According to the method disclosed by the invention, graphene prepared on a metal foil and by using an introduced catalyst promoter is of a double-layer structure, and the coverage rate of the double-layer grapheme is greater than 90%, therefore, the method has the advantages of simple technological process, high controllability on the number of graphene layers, high surface coverage rate of double-layer grapheme, less defects, and the like. The method is applicable to the large-area mass controllable production and preparation of double-layer graphene films, and can be widely applied to the fields of microelectronic and optoelectronic devices.