▎ 摘　　要

NOVELTY - Preparing graphene oxide film, comprises: preparing a graphene oxide gel slurry by concentration of a graphite oxide aqueous slurry; depositing the graphene oxide slurry on a surface; spreading the graphene oxide slurry on the low-friction surface by bar coating; and drying the graphene oxide slurry. USE - The method is useful for preparing graphene oxide film, which is useful for preparing a dual-layer graphene-oxide film and a graphene oxide fiber, where the oxide fiber is useful: for preparing a reduced graphene oxide fiber and a graphene oxide weave; and in a supported graphene oxide film (all claimed). ADVANTAGE - The method provides highly elastic graphene oxide films, with excellent mechanical properties, improved morphology as compared with current graphene oxide fibers, high electrical conductivity upon thermal reduction, and improved field emission properties. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) preparing a dual-layer graphene-oxide film, comprising preparing the graphene oxide film and applying a second layer to the graphene oxide film, where the second layer is carbon nanotubes, graphene nanoplatelets, molybdenum disulfide, tungsten disulfide, polymer nanofiber, carbon fibers, or metallic nanowires; (2) preparing a graphene oxide fiber, comprising preparing the graphene oxide film, cutting the graphene oxide film into strips and dry-spinning the graphene oxide film strips into a fiber; (3) preparing a reduced graphene oxide fiber, comprising preparing the graphene oxide fiber and reducing the graphene oxide fiber by at least one of thermal reduction and chemical reduction; (4) preparing a graphene oxide weave, comprising preparing many graphene oxide fibers and weaving the graphene oxide fibers to form a graphene oxide weave; and (5) a supported graphene oxide film, comprising a graphene oxide film bound to a support.