Graphene nanoribbon composite structure and method for making the same

A method for making a graphene nanoribbon composite structure, comprising:

• providing a substrate comprising a plurality of protrusions spaced apart from each other;
• growing a graphene film on a growth substrate;
• placing an adhesive layer on a surface of the graphene film away from the growth substrate;
• removing the growth substrate, and cleaning with water or an organic solvent;
• creating a winkled portion in the graphene film by combining the graphene film, the adhesive layer, and the substrate into a combination;
• and drying the combination, so that a portion of the graphene film becomes wrinkled following contours of the plurality of protrusions, to obtain a first composite structure;
• wherein the first composite structure comprises the substrate, the graphene film, and the adhesive layer;
• and the graphene film is between the adhesive layer and the substrate;
• removing the adhesive layer to obtain a second composite structure comprising the substrate and the graphene film, wherein the graphene film is located on the substrate;
• and
• etching a surface of the graphene film away from the substrate, to remove the graphene films except for the wrinkled portion, to form a plurality of graphene nanoribbons.