▎ 摘　　要

NOVELTY - A graphene single crystal film preparing method involves forming a copper single crystal film on a sapphire single crystal substrate, forming a nickel film on the copper single crystal film, subjecting nickel/copper /sapphire to high temperature annealing to obtain a copper-nickel single crystal alloy layer and growing graphene single crystal thin film on the copper-nickel single crystal alloy layer by atmospheric pressure chemical vapor deposition. USE - Method for preparing graphene single crystal film for graphene electronic device. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a graphene single crystal film produced by the method.