Patent ID: 8471237

Claim:
A circuit board having a graphene circuit, comprising: a base substrate; a patterned aluminum oxide film formed on the base substrate, the patterned aluminum oxide film having a composition of Al 2−x O 3+x (where x is 0 or more), the patterned aluminum oxide film having a recessed region whose surface has a flat surface and has one or more cone-shaped recesses therein; a graphene film preferentially grown only on the patterned aluminum oxide film, the graphene film having one or more graphene atomic layers, the graphene film having a contact region that covers the recessed region, the graphene film growing parallel to the flat surface of the recessed region and parallel to an inner wall surface of each cone-shaped recess of the recessed region; and a patterned metal film, an entirety of the contact region being covered by a part of the patterned metal film and having electrical contact directly with the patterned metal film, the patterned metal film filling each recess covered by the graphene film.