▎ 摘　　要

NOVELTY - Producing graphite oxide, comprises adding hydrogen peroxide into sulfuric acid solution mixed with graphite (graphite solution), and reacting graphite solution and hydrogen peroxide. USE - The graphite oxide is useful for manufacturing graphene nanosheet (claimed). ADVANTAGE - The method produces graphite oxide having high quality and conductivity, and stretches the folds of graphite. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for manufacturing graphene nanosheet, comprising expanding wrinkles by injecting energy into graphene nanosheet produced by reduction of graphite oxide, and post-processing to obtain terminal portion of graphene nanosheet with carbon nanotube shape.