▎ 摘　　要

NOVELTY - Flexible stretchable multifunctional nano fiber sensor, is claimed. The flexible stretchable multifunctional nano fiber sensor is prepared by carrying in-situ polymerization of polythiophene on the surface of nano-fiber film, dopping with graphene oxide to prepar a doped graphene oxide/polythiophene nanofiber membrane, where the nanofibers of polyurethane/polythiophene nanofiber membrane that make up the doped graphene oxide have a sheath-core structure, laminating gel film with a conductive copper wire on surface of doped graphene oxide-doped polyurethane/polythiophene nanofiber membrane. USE - Use as flexible stretchable multifunctional nano fiber sensor. DETAILED DESCRIPTION - Flexible stretchable multifunctional nano fiber sensor, is claimed. The flexible stretchable multifunctional nano fiber sensor is prepared by carrying in-situ polymerization of polythiophene on the surface of the nano-fiber film, dopping with graphene oxide to prepar a doped graphene oxide/polythiophene nanofiber membrane, where the nanofibers of the polyurethane/polythiophene nanofiber membrane that make up the doped graphene oxide have a sheath-core structure, laminating gel film with a conductive copper wire on the surface of the doped graphene oxide-doped polyurethane/polythiophene nanofiber membrane having a sheath-core structure to prepare a flexible pull-in cable capable of sensing pressure, stretching and bending of flexible stretchable multifunctional nano fiber sensor; where flexible stretchable multifunctional nano fiber sensor is a nano-fiber film doped with graphene oxide prepared by electrospinning as a flexible substrate. An INDEPENDENT CLAIM is also included for preparing the flexible stretchable multifunctional nano fiber sensor, comprising (1) mixing dimethylformamide and tetrahydrofuran in the mass ratio of 1:1-0.1 to obtain a mixed solvent, adding the graphene oxide powder into the mixed solvent, and dispersing the graphene oxide powder in the mixed solvent at a normal temperature for 3-8 hours to obtain a uniform graphene oxide solution, adding polyurethane particles, magnetic stirring for 5-15 hours at room temperature to obtain doped graphene oxide solution of polyurethane; (2) taking the polyurethane solution doped with graphene obtained in the step (1) as a spinning solution, transferring to a syringe for electrospinning, using a roller as a receiving device to obtain a doped graphene oxide polyurethane nanofiber membrane; (3) placing the polyurethane nanofiber film doped with graphene oxide obtained in the step (2) into a low-temperature plasma processing instrument to obtain a plasma-modified polyurethane grafted nanofiber film doped with graphene oxide; (4) adding ferric chloride powder into absolute ethanol, stirring to obtain a ferric chloride solution with a concentration of 50-100 mmol/L, immersing the polyurethane nanofiber membrane doped with graphene oxide in the step (m) for 3-20 minutes in the ferric chloride solution, taking out polyurethane nanofibrous membrane placed in an oven, and drying to obtain a doped graphene oxide uniformly coated with ferric chloride, (5) oxidizing the doped graphene surface obtained in step (4) uniformly adhered with ferric polyurethane nano fiber membrane suspension with concentration of 30-100 mmol mol/L, performing polymerization reaction for 10-30 hours under the condition of 20-40 degrees C, taking out and washing with absolute ethyl alcohol, adding into 20-70 degrees C vacuum drying box, drying for 0.5-2 hours obtain a polyurethane / polythiophene composite conductive nanofibrous membrane doped with graphene oxide having a sheath-core structure; (6) fixing the two copper wires with the conductive silver paste on both ends of the polyurethane/polythiophene composite conductive nanofibrous membrane with the sheath-core doped doped graphene oxide obtained in the step (5) to form two electrodes of the sensor, coating the liquid polydimethylsiloxane on the upper and lower surfaces of the doped graphene oxide-doped polyurethane/polythiophene composite conductive nanofiber membrane having a sheath-core structure, placing in a vacuum oven at 30-90 degrees C, curing for 30-180 minutes.