▎ 摘　　要

NOVELTY - Preparation of graphene involves injecting graphite powder and cosolvent into a high-pressure reactor, vacuumizing, sealing the high pressure reactor, adding n-hexane or propane supercritical solvent, slightly increasing the temperature and pressure of the reactor, and collecting the resultant material. USE - Preparation of graphene. ADVANTAGE - The method efficiently provides graphene having high quality and yield, by a simple process.