▎ 摘　　要

NOVELTY - Producing a graphene-based material (4), comprises: (a) providing a mixture of at least one carbide compound (2) and at least one etching compound (1) in the presence of a reaction solvent; (b) subjecting the obtained mixture to sonication at least at one frequency above 15 kHz for forming the graphene-based material. USE - The method is useful for producing a graphene-based material which is useful for producing one of electronic circuits, energy-storage devices, electrically conductive films, chemical sensors, optical materials, optoelectronic devices, composite materials, batteries, membranes, polymers, catalysts, inks or coatings. ADVANTAGE - The method: enables the industrial scale production of different graphene-based materials with high porosity, in a large amount, in a short time and even under mild conditions, i.e. at room temperature and atmospheric pressure; reduces the amount of chemicals required; does not require toxic reactants, and hence the method does not harm the environment; utilizes sonication of the mixture of carbide compound and etching compound which allows direct production of graphene-based materials e.g. two-dimensional porous graphene without the need for further reduction steps; utilizes carbides as starting materials which are cheap and can be easily synthesized in many ways, and hence the method is cost-effective; reduces the requirements regarding the equipment; and can be easily controlled. The obtained porous graphene-based material has excellent electrical conductivity, due to the direct chemical synthesis, and is free of any template and not attached to any substrate. The two-dimensional porous graphene can be directly used without transfer processes. The sonication provides the local reaction environment allowing the formation of the graphene-based material instead of the usual exfoliation environment requiring harsh conditions or toxic chemicals. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for the graphene-based material obtained by the above method. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of producing the graphene-based material. Etching compound in reaction solvent (1) Carbide compound (2) Ultrasonication (3) Graphene-based material or nanoporous two-dimensional graphene (4)