PROCESS FOR PREPARING GRAPHENE FILM AND GRAPHENE POWDER, AND GRAPHENE FILM AND GRAPHENE POWDER OBTAINED BY SAME PROCESSES

摘要

PURPOSE: A method for manufacturing a graphene film and graphene powder using a graphene oxide solution is provided to easily peel a graphene sheet. CONSTITUTION: A method for manufacturing a graphene oxide solution comprises: a step of oxidizing natural graphite to prepare graphite oxide; a step of adding graphite oxide, first and second oxidants to strong sulfuric acid to prepare a solution containing peeled graphene sheet; a step of inputting the solution into a membrane column and sealing; a step of dipping the membrane column to hydrochloride aqueous solution and performing primary sonication; and a step of dipping the membrane column to ultra-pure water and performing secondary sonication.