▎ 摘　　要

NOVELTY - Preparing graphene comprises (i) drying plant raw materials and mixing with amine compounds to obtain a mixture; and (ii) heating mixture in a high-temperature furnace. USE - The method is useful for preparing graphene. ADVANTAGE - The method: utilizes readily available raw material cost of graphene and low temperature resistance of the equipment; does not produce metal residue and generate waste gas and residue and produce pollution to the environment; and performs solid-phase synthesis in an ordinary high-temperature furnace with maximum synthesis temperature of about 900 degrees C. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for nitrogen-doped graphene, prepared as mentioned above.