▎ 摘　　要

NOVELTY - Supercritical sulfur hexafluoride stripping method for preparing graphene or graphene nano-sheets, involves (i) adding graphite and oxidant into a high pressure reactor, (ii) pumping sulfur hexafluoride into high pressure reactor, introducing sulfur hexafluoride after pressure in the reactor reaches preset value, (iii) reducing the pressure in the reactor to a normal pressure after the circulating flow time of sulfur hexafluoride reaches a preset value, (iv) repeating step (ii) and step (iii), so that material is subjected through repeated step-up and depressurization processes. USE - Supercritical sulfur hexafluoride stripping method for preparing graphene or graphene nano-sheets (claimed). DETAILED DESCRIPTION - Supercritical sulfur hexafluoride stripping method for preparing graphene or graphene nano-sheets, involves (i) adding graphite and oxidant into a high pressure reactor in a mass ratio of 1:0.1-50, (ii) pumping sulfur hexafluoride into high pressure reactor after the temperature in the reactor reaches a preset value, introducing sulfur hexafluoride after the pressure in the reactor reaches the preset value, (iii) reducing the pressure in the reactor to a normal pressure after the circulating flow time of the sulfur hexafluoride reaches a preset value, (iv) repeating the step (ii) and step (iii), so that the material is subjected through repeated step-up and depressurization processes, and obtaining graphene or graphene nano-sheets with different sizes by controlling number of step-up and step-down processes and the amount of oxidant in the graphene layer.