▎ 摘　　要

NOVELTY - The method comprises: dispersing 0.1-10 mg/ml of graphite into quinoline to form a graphene dispersed solution; centrifuging the dispersed solution; and extracting graphene from an upper layer of the dispersed solution. The dispersing step is carried out through stirring process and sonication process. The graphene is grown using hydrothermal synthesis method or solvothermal synthesis method after adding the graphite powder to the quinoline. The quinoline adding step comprises performing electrochemical treatment of graphite, and heat-treating the expandable graphite with a microwave. USE - The method is useful for producing a graphene (claimed) that is used for an electrical and electronic device, a nano-sensor and an optoelectronic device. ADVANTAGE - The method is capable of simply and economically producing graphene with controlled temperature and pressure and high productivity and without any damage. DETAILED DESCRIPTION - The method comprises: dispersing 0.1-10 mg/ml of graphite into quinoline to form a graphene dispersed solution; centrifuging the dispersed solution; and extracting graphene from an upper layer of the dispersed solution. The dispersing step is carried out through stirring process and sonication process. The graphene is grown using hydrothermal synthesis method or solvothermal synthesis method after adding the graphite powder to the quinoline. The quinoline adding step comprises performing electrochemical treatment of graphite, and heat-treating the expandable graphite with a microwave. The method further comprises dispersing graphene in a polar or non-polar solvent, after extraction. The solvothermal synthesis is carried out at a temperature of 10-500 degrees C and pressure of 1-5 MPa.