▎ 摘　　要

NOVELTY - Preparation of graphene solution involves dispersing 25-50 mg graphite and 100-200 mg polyvinylpyrrolidone in 5-10 ml water or ethanol, placing resultant dispersion in supercritical carbon dioxide reaction apparatus, reacting at 40-45 degrees C and 6-20 MPa for 0.5-7 hours under stirring condition, and lowering pressure to atmospheric pressure. USE - Preparation of graphene solution used for graphene composite material, photoelectric functional material and biomedical applications. ADVANTAGE - The method enables preparation of graphene solution having high quality and suppressed defect, with high yield, by simple, environmentally-friendly and economical process.