▎ 摘　　要

NOVELTY - Graphene oxide dispersion liquid comprises a polar solvent as a solvent, and contains no dispersing additive, and absorbs visible light at a wavelength of 330 nm of 50% or more of a completely dispersed state for at least one month. USE - The dispersion liquid is useful for producing a graphene oxide/polymer composite and reduced graphene oxide/polymer composite, and in batteries, catalysts, sensors, separation membranes, adsorbents, lubricants, adhesives, corrosion coatings, heat dissipation materials and transparent electrodes applications. ADVANTAGE - The dispersion liquid has excellent ionic conductivity, semiconductor properties, adsorption properties, electrical conductivity, thermal conductivity, barrier properties, dispersion stability using various polar solvents and non-polar solvents as dispersion solvents, and adsorptivity. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the dispersion liquid, involving (a) subjecting graphite oxide in water to single-layer peeling treatment to obtain a graphite oxide aqueous dispersion containing single-layer graphene oxide, (b) centrifuging the aqueous graphite oxide dispersion to remove a precipitate and collecting a supernatant to obtain a monolayer aqueous graphene oxide dispersion, and (c) subjecting the monolayer aqueous graphene oxide dispersion to a solvent replacement treatment with water or an organic solvent; (2) a process for producing a graphene oxide/polymer composite, involving mixing the graphene oxide dispersion liquid with a polymer or a polymer solution soluble in a solvent of the dispersion, and drying; and (3) a method for producing a reduced graphene oxide/polymer composite, involving reducing graphene oxide in the graphene oxide/polymer composite.