▎ 摘　　要

NOVELTY - The preparation method of small-sized graphene involves mixing purified aphanitic graphite, concentrated acid and strong oxidizing agent, reacting in a closed environment at 80-120 degrees C, pouring the reaction mixture slowly into an excessive deionized water, adding 25% aqueous hydrogen peroxide, stirring to obtain brown or bright yellow suspension, pickling, washing with water to adjust pH to 6-7, and centrifuging. The ratio of L-ascorbic acid and small-sized graphene oxide is 1:0.1-100. The reaction temperature is 40-100 degrees C, and reaction time is 1 minute-5 hours. USE - Preparation of small-sized graphene (claimed). DETAILED DESCRIPTION - The preparation method of small-sized graphene involves mixing purified aphanitic graphite, concentrated acid and strong oxidizing agent, reacting in a closed environment at 80-120 degrees C, pouring the reaction mixture slowly into an excessive deionized water, adding 25% aqueous hydrogen peroxide, stirring to obtain brown or bright yellow suspension, pickling, washing with water to adjust pH to 6-7, and centrifuging. The ratio of L-ascorbic acid and small-sized graphene oxide is 1:0.1-100. The reaction temperature is 40-100 degrees C, and reaction time is 1 minute-5 hours. The ratio of purified aphanitic graphite and concentrated acid is 1:20-80. The ratio of purified aphanitic graphite and strong oxidizing agent is 1:3-10.