▎ 摘　　要

NOVELTY - Preparing different sizes of graphene oxide, comrpises (i) carrying out oxidation-reduction of graphene, and drying in an oven at 50 degrees C for 24 hours, to obtain graphite oxide; (ii) mixing 0.1 g graphite oxide by placing in a 250 ml flask, adding 150 ml solvent, placing the flask in an ultrasonic cleaning machine to ultrasonically cleaning at 120 Hz for 1 hour, removing the solvent, to obtain a precipitate of colloidal graphene oxide, and precipitating the unseparated and non-distribute sizes of graphene oxide; and (iii) separating different sizes of graphene oxide. USE - The method is useful for preparing different sizes of graphene oxide (claimed). ADVANTAGE - The method overcomes the problems of: reduction method to prepare the graphene oxide product with uniform size, and distribution defects. DETAILED DESCRIPTION - Preparing different sizes of graphene oxide, comrpises (i) carrying out oxidation-reduction of graphene, and drying in an oven at 50 degrees C for 24 hours, to obtain graphite oxide; (ii) mixing 0.1 g graphite oxide by placing in a 250 ml flask, adding 150 ml solvent, placing the flask in an ultrasonic cleaning machine to ultrasonically cleaning at 120 Hz for 1 hour, removing the solvent, to obtain a precipitate of colloidal graphene oxide, and precipitating the unseparated and non-distribute sizes of graphene oxide; and (iii) separating different sizes of graphene oxide by (a) adding graphene oxide precipitate of size of hybrid non-distribution into 150 ml solvent, and allowing to stand for 2-6 hours to obtain an upper layer dispersion liquid A, (b) slowly pouring the upper layer dispersion liquid A, to obtain graphene oxide precipitate A, (c) taking graphene oxide precipitate A, and re-adding 20 ml solvent, and vigorously shaking, uniformly dispersing graphene oxide precipitate into solvent, and allowing to stand for a period of time, separating the upper layer dispersion liquid A, to obtain a precipitate, and repeating this operation for 5 times, to obtain upper layer dispersion liquid B and upper layer dispersion liquid B-graphene oxide sheets 1 (GOSs), where the size of GOSs is larger than 25 mu m of graphene oxide product, (d) allowing the upper layer dispersion liquid B to stand for 12 hours, to obtain the precipitate, and dispersing in solvent, and allowing the stand, and washing for 4 times, and obtaining the precipitate of graphene oxide C-GOSs2, having size of 15-25 mu m of graphene oxide product, (e) taking the dispersion A, and centrifuging at a speed of 500-2000 rotations/minute for 10 minutes, to obtain upper layer dispersion liquid C, and (f) taking graphene oxide precipitate D, washing with solvent, and centrifuging thrice to obtain graphene oxide deposition E-GOSs3, having size of 5 mu m to less than or equal to 15 mu m, and (g) taking dispersion liquid C, removing solvent to obtain graphene oxide deposition F-G0Ss4, having size of less than or equal to 5 mu m, and finally obtaining the product.