▎ 摘　　要

NOVELTY - Preparation of graphene oxide solution comprises carrying out hummers method to produce graphene oxide, performing centrifugal washing to obtain supernatant, collecting lower layer to obtain graphene oxide precipitate, placing graphene oxide precipitate into the container, adding water, stirring, centrifuging, removing precipitate to obtain good stability high concentration of graphene oxide hydrosol, extracting graphene oxide hydrosol, drying, calculating concentration of graphene oxide hydrosol, adding water, stirring, diluting and adding acid or alkali. USE - Method for preparing graphene oxide solution used for producing graphene film (claimed). ADVANTAGE - The product has good transparency and stability and strong mechanical strength. DETAILED DESCRIPTION - Preparation of graphene oxide solution comprises carrying out hummers method to produce graphene oxide, performing centrifugal washing to obtain supernatant with pH value of 3-7, collecting lower layer to obtain graphene oxide precipitate, placing graphene oxide precipitate into the container, adding water at volume ratio of 1:1-1-1.5, stirring, centrifuging, removing precipitate to obtain good stability high concentration of graphene oxide hydrosol, extracting graphene oxide hydrosol, drying, calculating concentration of graphene oxide hydrosol, adding water, stirring, diluting to the required concentration and adding acid or alkali to adjust the pH value. An INDEPENDENT CLAIM is included for application of graphene oxide solution comprising placing the prepared graphene oxide aqueous solution into an open vessel, putting open container in water bath and carrying out gas-liquid interfacial self-assembly method.