▎ 摘　　要

NOVELTY - A suspension is prepared by performing laser ablation in reaction medium containing 90-98 %mass sulfuric acid with respect to graphite and sulfonated graphite, and adding 60-98 %mass nitric acid and oxidant, by stirring in the presence of solid acid catalyst for sulfonation. 25-40 %mass hydrochloric acid and water is added to obtained suspension and sulfonated graphite is hydrolyzed to obtain graphene oxide. USE - Manufacture of graphene oxide used as intermediate for manufacturing graphene used for forming graphene film for transistor and very large scale integrated circuits. ADVANTAGE - The method is efficient and economical without using apparatus e.g. chemical vapor deposition apparatus.