▎ 摘　　要

NOVELTY - Preparing graphene oxide involves diluting the graphene oxide solution by solvent, where upper layer concentration of obtained graphene solution is 0.01-10mg/ml, stirring at speed of 2000-5000 revolution per minute (rpm) for 10-60 minutes to obtain large-size graphene oxide. The obtained product is centrifuged at speed of 6000-8000rpm at room temperature for 10-60 minutes. The upper layer of obtained solution is stirred at speed of 9000-11000rpm at room temperature for 10-60 minutes, where collected deposition portion is smaller size of graphene oxide. USE - Method for preparing graphene oxide (claimed). DETAILED DESCRIPTION - Preparing graphene oxide involves diluting the graphene oxide solution by solvent, where upper layer concentration of obtained graphene solution is 0.01-10mg/ml, stirring at speed of 2000-5000 revolution per minute (rpm) for 10-60 minutes to obtain large-size graphene oxide. The obtained product is centrifuged at speed of 6000-8000rpm at room temperature for 10-60 minutes. The upper layer of obtained solution is stirred at speed of 9000-11000rpm at room temperature for 10-60 minutes, where collected deposition portion is smaller size of graphene oxide. The upper liquid is the small size of the oxidation of small sized graphene. The obtained product is subjected to ultrasonic treatment at power of 100-900Watt for 10-240 minutes to obtain smaller size and more uniform graphene oxide.