▎ 摘　　要

NOVELTY - Preparation of ferromagnetic graphene by supercritical carbon dioxide involves (s1) dispersing graphite and polyvinylpyrrolidone into absolute ethanol, and adding hydrogen peroxide to obtain mixed solution, (s2) placing the mixed solution in a supercritical device, injecting carbon dioxide, reacting for 3-6 hours under a supercritical condition, cooling to room temperature, and slowly releasing the carbon dioxide to release pressure, and (s3) ultrasonically treating the obtained reaction liquid, performing centrifugal separation (C1) at 8000-10000 rpm, taking the upper layer solution, performing centrifugal separation (C2) at 15000-20000 rpm, taking the precipitate, washing with ethanol, and drying. The volume ratio of absolute ethanol and hydrogen peroxide is 1:(1-3). USE - Preparation of ferromagnetic graphene by supercritical carbon dioxide used in energy storage, composite materials, electronics and sensor. ADVANTAGE - The process utilizes supercritical carbon dioxide to directly process the non-magnetic graphite powder, realizes the induction of intrinsic ferromagnetism, and greatly improves the ferromagnetic response compared with the traditional defect engineering.