▎ 摘　　要

NOVELTY - Preparation of monocrystalline copper foil involves annealing metal element-doped polycrystalline copper foil. The monocrystalline copper foil is monocrystalline copper(III) foil. USE - Preparation of monocrystalline copper foil used for growing two-dimensional large-sized graphene and boron nitride material (all claimed). ADVANTAGE - The method provides monocrystalline copper foil by simple and economical process. The two-dimensional large-sized graphene obtained using the monocrystalline copper foil has high quality. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for large-sized monocrystalline graphene.