▎ 摘　　要

NOVELTY - A stress sensor comprises two sensing components. Each sensing component comprises a polydimethylsiloxane adhesive base layer and a core-spun yarn-graphene composite conductive layer. The base layer is obtained by spin coating or dripping polydimethylsiloxane prepolymer, and is formed into a film after curing. The core-spun yarn-graphene composite conductive layer is obtained by assembling graphene dispersion liquid to a core yarn frame. Two sensing components are attached. One side of the core-spun yarn-graphene composite conductive layer is provided in middle. The sensor forms a sandwich structure. Each core of the core-spun yarn-graphene composite conductive layer of each sensing component is connected with a lead wire. The yarn frame is a yarn having diameter of 10-30 mu m. The yarn is spandex and/or nylon. The polydimethylsiloxane adhesive base layer has a thickness of 200-500 mu m. USE - Stress sensor. ADVANTAGE - The flexible stress sensor has improved sensitivity, and reduces the detection limit. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation method of stress sensor, which involves (1) preparing graphene dispersion liquid with concentration of 0.01-0.4 mg/mL, (2) mixing component (A) and component (B) in a culture dish in a mass ratio of (10-15):1, stirring for 10-30 minutes, vacuum defoaming to bubble-free surface, and pre-curing in a oven at 55-65 degrees C for 10-20 minutes to obtain polydimethylsiloxane solution, (3) spin-coating polydimethylsiloxane solution on a polyethylene terephthalate substrate, solidifying at 55-65 degrees C for 15-25 minutes, peeling off from the surface of the substrate to obtain viscous polydimethylsiloxane film with thickness of 200-500 mu m, (4) placing core-spun yarn in an UV-ozone cleaning apparatus, performing hydrophilization treatment, immersing core-spun yarn in reduced graphene oxide dispersion for 5-30 minutes, taking out and drying to obtain core-spun yarn-reduced graphene oxide composite, and (5) applying core-spun yarn-reduced graphene oxide composite on a surface of the viscous polydimethylsiloxane film to obtain a sensing assembly for assembling two sensing components, where one side of the core-spun yarn-reduced graphene oxide composite is opposite, and connecting the wires at both ends of the omentum.