▎ 摘　　要

NOVELTY - Preparing carbon nanotube/graphene composite fiber comprises (i) adding multi-walled carbon nanotube and graphene into the sodium alginate aqueous solution to obtain uniformly dispersed carbon nanotube/graphene suspension; (ii) placing carbon nanotube/graphene suspension in a syringe pump and injecting into a rotating ethanol solution of calcium chloride at a rate of 40-70 ml/hour to obtain black, flexible, wet carbon nanotube/graphene composite fiber; and (iii) washing carbon nanotube/graphene composite fiber with deionized water and ethanol sequentially, and drying at room temperature to obtain black carbon nanotube/graphene composite fiber. USE - The carbon nanotube/graphene composite fiber is useful in field of high-toughness composite nano preparation. ADVANTAGE - The method solves the stability and dispersion effect of the spinning dope and realizes the problem of continuous and uniform filament production during the spinning process, uses natural polysaccharide material sodium alginate as a surfactant to disperse carbon nanotubes and graphene, compared with traditional surfactants, the introduction of sodium alginate reduces the amount of surfactants reduces the amount of non-nano carbon material components, which is beneficial to the improvement of the mechanical and electrical properties of the final nanocomposite fiber. The composition of the nano-material system in the carbon nanotube/graphene composite fiber can be as high as 80%, the Young's modulus of single filament stretching can reach 2056.24 MPa, the tensile strength can reach 24.46 MPa and the resistivity is as low as 1.6x 103 Omega .m.