Method for preparing graphene-based composite

A method for preparing a graphene-based composite, comprising the steps of:

• (a) providing graphene films, each of the graphene films being obtained by subjecting a raw material component containing a graphene powder, a liquid epoxy resin, and a curing agent to a molding process, followed by conducting a solidification process and a demolding process in sequence;
• (b) aligning and stacking the graphene films along a first direction perpendicular to surfaces of the graphene films, followed by conducting a hot pressing treatment at a pressure ranging from 10 kg/cm2 to 12 kg/cm2 to allow the surfaces of the graphene films to fuse with each other, so as to form a graphene laminated structure;
• (c) cutting the graphene laminated structure along the first direction or a second direction that is parallel to the first direction and that is oriented oppositely to the first direction, so as to obtain a graphene sheet having a cutting surface;
• and
• (d) depositing copper onto the cutting surface of the graphene sheet by a sputtering process to form a copper film on the graphene sheet, so as to obtain the graphene-based composite;
• wherein in step (a), the liquid epoxy resin is present in an amount ranging from 3 parts by weight to 5 parts by weight, based on a total amount of the graphene powder and the liquid epoxy resin as 100 parts by weight.