▎ 摘　　要

NOVELTY - A functional nanographene is prepared by adding graphene oxide (GO) into water, where concentration of graphite is 0-100 g/L; adding penetrant(s), ultrasonically stirring or fast mechanically stirring for 1-5 hours to form brown or black suspension; ultrasonically oscillating or fast mechanically stirring, loosening swollen GO and dissociating; increasing temperature to 70-100 degrees C, refluxing for 4-24 hours, washing and drying to obtain nanographene, where diameter of graphite sheet is 1-3 mu m, and thickness is 2-6 nm. USE - Method for preparation of functional nanographene (claimed). ADVANTAGE - The nanographene exhibits folding property and high diameter-thickness ratio. The method has simple process, reliable production theory, easily obtained raw materials, low cost, good nano function, stable structural property and good application effect.