Patent ID: 9327985
Filing Date: 2016-05-03
CPC Classification: B82Y,C01B,F16D

Claim Text:
1. A method for producing a graphene oxide sheet which changes to a compound having a graphene structure when reduced, the method comprising: (a) dispersing a graphene-containing carbon substance, having aggregates, with a dispersant to reduce the size of the aggregate units and to form a colloidal solution containing the graphene-containing carbon substance; (b) adding an oxidizing agent to the colloidal solution from step (a), and removing water by lyophilization to adjust the water content to 10 wt % or less to obtain a water-removed composition, the water-removed composition being a powder composition containing the oxidizing agent and the graphene-containing carbon substance; and (c) mixing the water-removed composition from step (b) with concentrated sulfuric acid to oxidize the graphene-containing carbon substance.