▎ 摘　　要

NOVELTY - Preparing small-size graphene comprises (i) adding copper chloride, potassium salt mixture and compound additives into the water to prepare plating solution, performing copper plating using copper rod as the anode and aluminum film silicon dioxide sheet used as cathode to obtain the substrate; (ii) continuously introducing inert gas into the reaction chamber to remove the air in the reaction chamber, and placing the substrate in the reaction chamber under the protection of the inert gas, and heating; (iii) introducing the mixture of inert gas and carbon-containing organic gaseous substance into the reaction chamber to react for 10-30 minutes, stopping the introduction of carbon-containing organic gaseous substance and cooling; and (iv) taking out the substrate, placing in the mixed acid solution for 60-90 minutes, placing in sulfuric acid solution again for 120-200 minutes, filtering, washing the product to neutrality and drying. USE - The method is useful for preparing small-size graphene. ADVANTAGE - The method has high purity, small size, uniform distribution, good controllability and low energy consumption. The graphene is environment-friendly and economical and has transverse size of 50-200 nm, and carbon content of greater than or equal to 87%. DETAILED DESCRIPTION - Preparing small-size graphene comprises (i) adding copper chloride, potassium salt mixture and compound additives into the water to prepare plating solution with pH value of 8 plus minus 0.5, temperature of 40-50 degrees C, current density of 2-5 A/dm2, ultrasonically processing under the conditions of a constant temperature oil bath with an ultrasonic power of 100-140 W and an ultrasonic frequency of 40-50KHz, performing copper plating using copper rod as the anode and aluminum film silicon dioxide sheet used as cathode to obtain the substrate; (ii) continuously introducing inert gas into the reaction chamber to remove the air in the reaction chamber, and placing the substrate in the reaction chamber under the protection of the inert gas, heating the reaction chamber from room temperature to 670-1100 degrees C in stages, heat preserving for 10-30 minutes; (iii) introducing the mixture of inert gas and carbon-containing organic gaseous substance into the reaction chamber to react for 10-30 minutes, stopping the introduction of carbon-containing organic gaseous substance, continuing the flow of inert gas for 10-30 minutes and cooling by circulating cooling oil until the temperature of the reaction chamber drops to room temperature; and (iv) taking out the substrate, placing in the mixed acid solution for 60-90 minutes, placing in sulfuric acid solution again for 120-200 minutes, filtering, washing the product to neutrality and drying.