▎ 摘　　要

NOVELTY - Metal ion crosslinked high-strength stable graphene oxide film comprises the graphene oxide film, which is formed by layer-by-layer stacking of graphene oxide nanosheets, and the oxygen-containing functional groups on the graphene oxide nanosheets which are complexed with metal ions to form a regular interlayer channel, where the atomic percentage of the metal elements in the graphene oxide film is 0.48-1.19%, and the tensile breaking stress of the graphene oxide is 108-136 MPa. USE - As metal ion crosslinked high-strength stable graphene oxide film. ADVANTAGE - The metal ion crosslinked high-strength stable graphene oxide film increases the content and uniformity of the distribution of metal ions in the film, improves the stability and mechanical properties of the graphene oxide film, effectively reduces the production cost, and realizes large-area oxidation low-cost preparation of graphene films. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the metal ion crosslinked high-strength stable graphene oxide film, comprising (a) dispersing graphene oxide uniformly in water to form a graphene oxide dispersion with a concentration of 0.5-2.0 mg/ml, (b) flatly laying the metal foil in the container, and laying the base material film soaked with water on the metal foil, where the size and shape of the metal foil are consistent with the substrate film, and (c) pouring the graphene oxide dispersion liquid into a container, submerging the base material film and the metal foil, and leaving still to deposit for at least 6 hours, where in the standing deposition process, the weakly acidic graphene oxide dispersion liquid is etched to etch the metal foil, so that the metal foil continuously releases the metal ions, due to the electrostatic attraction effect, due to the electrostatic attraction effect, the positively charged metal ions penetrate through the substrate film to migrate into the graphene oxide dispersion liquid and are complexed with the oxygen-containing functional groups of the graphene oxide, so that the graphene oxide nanosheet layer is stacked to form an interlayer channel regular metal ion cross-linked graphene oxide film, and after the standing deposition is completed, washing to remove metal ions that are unstable in combination with graphene oxide, drying the metal ion-crosslinked graphene oxide film along with the substrate film, and stripping the dried metal ion-crosslinked graphene oxide film from the substrate film.