Feasibility Study on Preparation of Graphene by Exfoliated Graphite

The exfoliated graphite was prepared from natural flake graphite by chemical oxidation intercalation acidification,washing,drying and heat expansion process,then a small layer number of graphene sheets are produced by the way of ultrasonic exfoliation.Besides,related factors and the intercalation mechanism when prepare the exfoliated graphite were discussed.The results showed that the exfoliated graphite prepared under different process conditions,the change of the space between layers was very small,while the diffraction intensity was obviously decreased.No matter the exfoliated graphite was prepared of small or large flake graphite flake graphite,small layers of graphene sheets can be produced by acid treatment and ultrasonic exfoliation after adding the intercalation agent.Using exfoliated graphite to produce graphene was a highly efficient and practicable way.