▎ 摘　　要

NOVELTY - Preparation method of graphene-based hybrid multilayer structure fiber material, comprises (i) injecting graphene oxide aqueous dispersion into the coagulation bath of the transition metal salt with the solute mass fraction of 5% to prepare the grapheme oxide (GO) fiber through the wet spinning technology and adjusting the injector speed and coagulation bath rotation speed and other parameters to prepare continuous and uniform diameter GO fibers, where the size of the fiber can be determined by selecting spinning nozzles of different sizes; (ii) placing GO fiber obtained at room temperature for 12 hours to dry, and placing the fiber; (iii) mixing rGO fiber with an melamine, thermally reducing mixture in a tube furnace under an inert gas atmosphere at a heating rate of 5 degrees C/minutes at 700 degrees C for 0.5 hours, where the in-situ growth of carbon nanotubes CNT on the surface and inside of the rGO fiber is realized. USE - The material is useful for sensor conductive material and in single or multiple fibers to obtain different sensor performance (claimed). ADVANTAGE - The material has high sensitivity, large detection range, fast response speed, good stability and simple preparation process; avoids toxic product generated in the reaction process; reduces energy consumption; and is environmentally-friendly. DETAILED DESCRIPTION - Preparation method of graphene-based hybrid multilayer structure fiber material, comprises (i) injecting graphene oxide aqueous dispersion into the coagulation bath of the transition metal salt with the solute mass fraction of 5% to prepare the grapheme oxide (GO) fiber through the wet spinning technology and adjusting the injector speed and coagulation bath rotation speed and other parameters to prepare continuous and uniform diameter GO fibers, where the size of the fiber can be determined by selecting spinning nozzles of different sizes; (ii) placing GO fiber obtained at room temperature for 12 hours to dry, and placing the fiber under the airtight condition of a strong reducing agent solution atmosphere and heating at 90 degrees C for 2 hours to chemically reduce graphene oxide to obtain reduced graphene oxide (rGO) fiber; (iii) mixing rGO fiber with an melamine, thermally reducing mixture in a tube furnace under an inert gas atmosphere at a heating rate of 5 degrees C/minutes at 700 degrees C for 0.5 hours, where the in-situ growth of carbon nanotubes CNT on the surface and inside of the rGO fiber is realized INDEPENDENT CLAIMS are also included for (1) graphene-based hybrid multilayer structure fiber material prepared as mentioned above; and (2) use method of fiber material in manufacturing method of a sensor conductive material comprising (a) spreading layer of polydimethylsiloxane (PDMS) on the polytetrafluoroethylene board, and using it as the sensor substrate after drying, (b) cutting fiber to a suitable length, connecting the two ends with a conductive silver glue to the copper wire as electrodes, and placing the whole on the substrate, solidifying the silver glue, covering the fiber with a layer of polydimethylsiloxane, encapsulating, cutting off the excess part to get the sensor, carrying out mechanical performance test on the universal material testing machine and the current signal is collected by the current source after the data collection is completed and using the origin software for drawing and analysis.