▎ 摘　　要

NOVELTY - Preparing graphene, comprises: (a) oxidizing a graphite material to form graphite oxide; (b) dispersing graphite oxide into water to form an aqueous suspension of graphite oxide; (c) adding a dispersing agent to the aqueous suspension of graphite oxide; and (d) adding an acidic reducing agent to the aqueous suspension of graphite oxide so that the graphite oxide is reduced to graphene by the acidic reducing agent, and the graphene is further bonded with the dispersing agent to form a graphene dispersion including a surface-modified graphene. USE - The method is useful for preparing graphene (claimed), which is useful as a soft electronic material. ADVANTAGE - The method allows simple and effective preparation of thin and strong graphene with high flexibility, purity, yield, stability, electron mobility and thermal conductivity and low optical reflectivity.