▎ 摘　　要

NOVELTY - Graphite is made up of thousands of graphene layers. If separate the layers, it is graphene. However mechanical grinding can not achieve this purpose. The invention is to immerse graphite in an organic solvent or liquid carbon dioxide, and allow graphite to absorb solvents to saturation. After a few days, take it out and heated it to high temperature and high pressure in an oxygen-free vessel, and then reduce the pressure suddenly to normal pressure. The organic solvent or carbon dioxide between the graphene layer gasifies instantly and bursts the graphite into graphene, just like making popcorn. The fragment is then milled with solvent. The graphene suspend in the solvent and the graphite precipitate. Separate it and get graphene.