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Application of ionic liquids on green exfoliation preparation of graphene in large scale

Graphene has attracted much attention since it was discoveried for its excellent physical and chemical properties. Thus, it is vital to prepare high-quality graphene in large scale, especially in green methods. Among them, liquid phase exfoliation is a promising method for large-scale preparation of graphene. Green solvent ionic liquid-assisted graphite exfoliation is worthy of much attention, which can obtain monolayer and few-layer graphene, and the yield is nearly two orders of magnitude higher than that of the earlier used organic solvent N -methylpyrrolidone. Here, we firstly classified and summarized the various solvents used in liquid phase exfoliation, then based on this, we discussed the application of ionic liquids for the actual exfoliation preparation of graphene. And it provides a reference for seeking strategies which can overcome many of the challenges faced by current liquid phase exfoliation methods in order to develop more efficient green exfoliation systems.