▎ 摘　　要

NOVELTY - Liquid type flexible strain sensor prepared by (1) adding graphite nanosheets to the chromic acid washing solution for ultrasonic dispersion, stirring, pouring water, filtering, washing and baking, (2) reacting obtained graphene oxide suspension and hydrogen iodide solution of the uniform mixture, (3) dispersing RGO/chitosan dispersion in the phosphoric acid buffer solution, (4) performing spinning with the RGO/chitosan slurry after defoaming as spinning solution, (5) soaking gained RGO/chitosan conductive fibers in the silver nanowire solution, (6) stirring and dissolving AIEgens in toluene, (7) pulling the RGO/chitosan/silver nanowire conductive fiber and fixing it on both ends of the paper frame with copper foil conductive tape, (8) mixing the tetraethyl orthosilicate and the platinum catalyst, and (9) placing the two ends of the unencapsulated fiber as electrodes on the cured polymer, is claimed. USE - The sensor is useful for fluorescent electronic skin based on liquid gallium (claimed), wear-resistant electronic device, smart watch, bracelet and glasses. ADVANTAGE - The sensor has improved mechanical property of chitosan, electrical and thermal performance, and increased dispersibility of solution. DETAILED DESCRIPTION - Liquid type flexible strain sensor prepared by (1) adding graphite nanosheets to the chromic acid washing solution for ultrasonic dispersion, stirring, pouring water, filtering, washing, baking, and cooling to room temperature, (2) reacting obtained graphene oxide suspension and hydrogen iodide solution of the uniform mixture, and centrifuging and washing to obtain reduced graphene oxide (RGO) suspension, (3) dispersing RGO/chitosan dispersion in the phosphoric acid buffer solution, adding Triton X-100(Polyethylene glycol octylphenol ether) as surface-active agent, performing ultrasonic treatment, adding glacial acetic acid solution, stirring to form uniform RGO acetic acid solution, adding chitosan in the RGO acetic acid solution, stirring until fully dissolved, centrifuging gained RGO/chitosan solution, pouring supernatant to obtain RGO/chitosan slurry, and transferring RGO/chitosan slurry to the spinning vessel for defoaming, (4) performing spinning with the RGO/chitosan slurry after defoaming as spinning solution, extruding spinneret by spinning solution, entering in coagulation bath through air, where coagulation bath is the mixed solution of sodium hydroxide solution and ethanol, solidifying in coagulation bath, washing with water, stretching, and drying to obtain RGO/chitosan conductive fibers, (5) soaking gained RGO/chitosan conductive fibers in the silver nanowire solution, taking out and drying, immersed again, taking out and drying, and repeating the above steps for many times, (6) stirring and dissolving AIEgens in toluene, adding tetraethyl orthosilicate to the obtained AIEgens solution and stirring, evacuating resulting mixture until all the solvent evaporated, adding sulfur for cross-linking, mixing, and vacuum degassing the mixture for pre-curing, (7) pulling the RGO/chitosan/silver nanowire conductive fiber and fixing it on both ends of the paper frame with copper foil conductive tape, wrapping the fiber with paper frame, pouring the fluorescent polymer into the paper frame, and encapsulating the middle section of the fiber after curing, where the two ends are not encapsulated, (8) mixing the tetraethyl orthosilicate and the platinum catalyst, uniformly stirring, pouring it into the sensor mold after vacuum degassing, allowing to stand for curing to obtain cured polymer, inhaling the liquid metal gallium with syringe and injecting it into the liquid metal mold, pressing it with glass sheet, cooling the liquid metal to solid state, obtaining rectangular parallelepiped gallium metal, and taking it out and using it as liquid channel mold, and (9) placing the two ends of the unencapsulated fiber as electrodes on the cured polymer, placing the liquid channel mold on the cured polymer to press the two ends of the fiber, mixing the tetraethyl orthosilicate and the platinum catalyst and uniformly stirring, pouring into the sensor mold after vacuum degassing to wrap the electrodes and the liquid channel mold, and preparing the liquid flexible strain sensor for skin after allowing to stand and curing, is claimed.