Yarn-based strain sensors serve as essential elements for wearable electronics in the applications of personal health monitoring,motion detection,and smart garments.In the paper,a yarn-based strain sensor was created by coating conductive polymer,polypyrrole(PPy),onto a double covered elastic yarn,i.e.,polyurethane/polyamide/polyamide(PU/PA/PA)yarn.Surface morphology of the yarn-based strain sensors demonstrates that the PPy conductive particles are evenly distributed on the surface of the PA multi-filaments as well as immersed into the PU core.Cyclic tensile test is conducted to characterize the electro-mechanical performance of the yarn-based strain sensor.The mechanical hysteresis of the sensor is low,which mainly comes from the geometrical change of the PA filaments around the PU core.However,the electro-mechanical hysteresis of the sensor is large mainly due to the unrecoverable cracks of the PPy layers on the PU core.
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