▎ 摘　　要

NOVELTY - Producing graphene, comprises flash annealing the liquid-phase fluid containing graphene grains contained in the vessel or flowing along the flow path to heal the defects of the oxidized graphene, where in the method of producing the graphene in which defects are healed from oxidized graphene oxide. USE - The grapheme is useful for producing patterns, products and devices. ADVANTAGE - The method is capable of smoothing the structural and chemical defects that occur during graphene synthesis or processing through flash annealing in the fluid. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) device comprising a chamber having a microfluidic channel, a liquid phase fluid inlet, a liquid phase fluid outlet, a gas outlet for removing gas generated during the reaction, and a light transmissive window mounted on the chamber; and (2) element produced by the above method, by introducing graphene-containing liquid-phase fluid into the container or performing flash annealing the electrical conductivity and/or the reduced state characteristic of graphene.