▎ 摘　　要

NOVELTY - Preparing hundred micron-sized graphene oxide comprises selecting the natural crystalline flake graphite in the particle diameter range of 200-600 mu m, firstly pre-oxidizing it to obtain expandable graphite, then heating to obtain the expansion graphite, then using concentrated sulfuric acid, sodium nitrate and potassium permanganate oxidation intercalation treatment to graphite, pumping, filtering and washing, washing the solution of metal and inorganic ion, then sieving the grain diameter is more than 200 mu m of graphite oxide, ultrasonic peeling vacuum freeze drying. USE - The method is useful for preparing hundred micron-sized graphene oxide (claimd). ADVANTAGE - The method is simple and has high efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for hundred-micron-sized graphene oxide, the particle diameter is 100 mu m.