Facile growth of centimeter-sized single-crystal graphene on copper foil at atmospheric pressure

By mildly oxidizing Cu foil and slowing down the total gas flow rate, we develop an easily repeatable atmospheric growth method to grow single-crystal graphene of centimeter-size. The graphene edge, which is different from the previously reported straight edge, is connected by a series of graphene-corners. The graphene-corner, ranging between 100° and 110°, is formed by a zig-zag edge and a mix edge. The oxidation of Cu crystal boundaries results in the rearrangement of active Cu sites for graphene nucleation, thus suppressing graphene nucleation density.