▎ 摘　　要

NOVELTY - Preparing high-quality graphene comprises e.g. (i) preparing expanded graphene by adding graphene powder, heating, cooling to room temperature to obtain thermal expansion graphene powder, (ii) cutting to obtain graphene, heating expandable graphite powder with sodium chlorate surfactant by dissolving in methyl pyrrolidone NMP reagent, and then stirring under high speed emulsifying machine, and (iii) removing and sample purification: (iiia) vacuum filtering cut sample reagent to remove reagent, and (iiib) extracting filtered material, and then centrifuging to obtain purified product. USE - The method is useful for preparing high-quality graphene (claimed). ADVANTAGE - The graphene is simple, easy to operate, environmentally friendly and suitable for mass production in a short time, has stable process and low cost and excellent conductivity. DETAILED DESCRIPTION - Preparing high-quality graphene comprises (i) preparing expanded graphene by adding graphene powder in a ceramic crucible, heating at high temperature, cooling to room temperature to obtain thermal expansion graphene powder, (ii) cutting to obtain graphene, heating expandable graphite powder with sodium chlorate surfactant by dissolving in methyl pyrrolidone NMP reagent, and then stirring under high speed emulsifying machine, and (iii) removing and sample purification: (iiia) vacuum filtering cut sample reagent to remove reagent, and (iiib) extracting step (iiia) the filtered material, and then centrifuging to obtain purified product.