▎ 摘　　要

NOVELTY - Multi-component nanometer carbon fiber yarn strain sensor comprises nanofibers, where the inside of the nanofibers has a multi-component conductive network composed of dot-shaped carbon black, linear carbon nanotubes and sheet-shaped graphene bridging each other. When the mass fraction of the carbon black is 0-35%, the mass fraction of the carbon nanotubes is 0-35%, the mass fraction of the graphene is 0-15%, the carbon black, carbon nanotubes, and the total mass fraction of graphene is 15-35%. When the remaining components are thermoplastic polyurethane, the conductivity of the sensor is 3.59 × 10-6 - 0.212 S/cm, and the maximum detection strain is 93-439%. The sensitivity in the 100% strain range is 4.67-1258.3, and the response time is less than -300 m/second. USE - Multi-element nano-carbon fiber yarn strain sensor used in sensor, capacitor and generator field used in clothes, wrist and knee, sports equipment and other objects on human body such as stick human body movement and physiological information such as breathing and heartbeat. ADVANTAGE - The multi-element nanometre carbon fiber yarn strain sensor is simple and reasonable, and provides conductive nano fiber yarn with weaving and washable property that can be prepared in large scale, and can be directly used as strain sensor. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the multi-component nanometer carbon fiber yarn strain sensor comprising (a) adding carbon black, carbon nanotubes, graphene and a dispersant with anti-settling effect to nano-carbon particles into a mixed solvent of dimethylformamide and tetrahydrofuran, and ultrasonically disperse after stirring, adding the thermoplastic polyurethane particles to the multi-component nano-carbon dispersion liquid, and after stirring, and carrying out ultrasonic dispersion to obtain a spinning solution, (b) using an electrostatic spinning device to continuously prepare multi-component carbon nanofiber bundles from the spinning solution, and merging, twisting and shaping the multi-component carbon nanofiber bundles to form a multi-component carbon nanofiber yarn, and (c) cutting off 3-10 cm multi-component carbon nanofiber yarn, fixing both ends of the yarn between two sheets of 1 cm × 2 cm aluminum foil paper with conductive silver glue to form electrodes, waiting for the multi-component carbon nanofiber at room temperature, after the yarn is completely dried, encapsulating the aluminum foil electrodes with insulating tape, and adjusting the length of the yarn used by the sensor according to the required measurement range to form a multi-component carbon nanofiber yarn strain sensor.