▎ 摘　　要

NOVELTY - Preparing few-layer graphene comprises e.g. (i) processing liquid phase intercalation by adding moderate graphite particles into an aqueous solution, stirring, processing ultrasonic treatment, placing tetra-alkyl substituted quaternary amine cation between graphite layers to obtain graphite intercalation complex, filtering, washing, and drying; (ii) processing microwave radiation on filter residue, dispersing treated graphite to perform ultrasonic treatment to peel the graphite to obtain graphene, and centrifuging; and (iii) filtering graphene dispersion liquid, and drying or freeze-drying. USE - The method is useful for preparing few-layer graphene. ADVANTAGE - The method: is simple, short and economical; has high graphene yield, good repeatability, less defects, less oxygen containing radicals and high electric conductivity; easily achieves large-scale industrial production; and produces the few-layer graphene with less than 10 layers. DETAILED DESCRIPTION - Preparing few-layer graphene by combining a liquid phase intercalation technology and a microwave radiation technology, comprises (i) processing liquid phase intercalation by adding moderate graphite particles into an aqueous solution containing tetra-alkyl substituted quaternary amine cation, an aqueous inorganic alkali and a stabilizer, or adding into an aqueous solution containing tetra-alkyl ammonium hydroxide and a stabilizer, uniformly stirring, placing the suspension in an ultrasonic machine, processing ultrasonic treatment, placing the tetra-alkyl substituted quaternary amine cation between graphite layers to obtain a graphite intercalation complex to increase the distance between the graphite layers, filtering the suspension, washing the filter residue with deionized water and ethanol, and drying; (ii) processing microwave radiation on the filter residue obtained in the step (i) in a microwave device to decompose the graphite intercalation complex to obtain large amount of gas for further increasing the distance between the graphite layers, dispersing the treated graphite into a low polar organic solvent to perform ultrasonic treatment to peel the graphite to obtain graphene, centrifuging the ultrasonically treated product in a centrifugal tube to precipitate the graphite which is not completely peeled, where the supernatant is less layer of graphene dispersion liquid; and (iii) filtering the graphene dispersion liquid by a microporous filtration membrane and drying or freeze-drying the graphene dispersion liquid to obtain few-layer graphene dispersion liquid, i.e., few-layer graphene, where the few-layer graphene is prepared by combining a liquid phase intercalation technology and a microwave radiation technology.