▎ 摘　　要

NOVELTY - Graphene oxide material with high strength and high toughness comprises a microfibrillated structure and is composed of graphene oxide microfibers arranged side by side, and the graphene oxide microfibers are combined through van der Waals force between graphene oxide sheets. The material is a fiber or a film; the smaller the diameter of the microfibers, and the more microfibers contained in the material, and its strength and toughness is higher. The spinning liquid used in preparation is an aqueous phase dispersion liquid, dimethylformamide phase dispersion liquid, dimethylacetamide (DMAc) phase dispersion liquid, and dimethyl sulfoxide phase dispersion liquid of graphene oxide, and the coagulation bath is ethyl acetate, dichloromethane, acetic acid, ethanol, water, isopropyl alcohol, chloroform, and acetone or their mixed coagulation bath. The reagent used by the chemical reduction is hydroiodic acid, hydrazine hydrate, sodium ascorbate, and stannous chloride. USE - The graphene oxide material is useful in the field of nanomaterials. ADVANTAGE - The graphene oxide material has increased crack propagation path when the material breaks, and increased energy consumed during the break, so it exhibits properties of both high strength and high toughness. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: a graphene material with high strength and high toughness; preparing graphene oxide material; and preparing graphene material.