▎ 摘　　要

NOVELTY - The method comprises forming a hexagonal boron nitride layer (130) in an upper side of a noncatalytic substrate (110), forming a metal catalytic layer (150) at an upper part of the hexagonal boron nitride layer, forming a top graphene layer (190) at an upper part of the metal catalytic layer, and removing the metal catalytic layer and the top graphene layer, where carbon is supplied to the metal catalytic layer. The noncatalytic substrate comprises silicon substrate, silicon/silicon dioxide substrate, sapphire substrate, quartz substrate and glass substrate. USE - The method is useful for manufacturing a graphene co-extruded film (claimed). ADVANTAGE - The method is capable of preventing surface roughness problem in the hexagonal boron nitride layer formation. DETAILED DESCRIPTION - The method comprises forming a hexagonal boron nitride layer (130) in an upper side of a noncatalytic substrate (110), forming a metal catalytic layer (150) at an upper part of the hexagonal boron nitride layer, forming a top graphene layer (190) at an upper part of the metal catalytic layer, and removing the metal catalytic layer and the top graphene layer, where carbon is supplied to the metal catalytic layer. The noncatalytic substrate comprises silicon substrate, silicon/silicon dioxide substrate, sapphire substrate, quartz substrate and glass substrate. The metal catalytic layer has a thickness of 10-100 nm. The step of forming the metal catalytic layer comprises patterning the metal catalytic layer and depositing the metal catalytic layer at the upper part of the hexagonal boron nitride layer. The step of patterning the metal catalytic layer comprises patterning a channel region for connecting a source region in a central part of the metal catalytic layer and a drain region. An INDEPENDENT CLAIM is included for a graphene co-extruded film. DESCRIPTION OF DRAWING(S) - The diagram shows a schematic perspective view of a metal catalytic layer before removing a top graphene layer in a graphene co-extruded film manufactured by a graphene co-extruded film manufacturing method. Graphene co-extruded film (100) Noncatalytic substrate (110) Hexagonal boron nitride layer (130) Metal catalytic layer (150) Top graphene layer. (190)