Highly-accurateWearable Piezoresistive Sensors without Tension Disturbance Based on Weaved Conductive Yarn

Abstract: Wearablepiezoresistive sensor has attracted wide attention for its application in humanactivities monitoring, smart robot, medical detection etc. However, most of thesensing signals collecting from the piezoresistive sensor are triggered bycoupling forces, such as the combination of tension and pressure. Thus, thepiezoresistive sensor would be incapable of accurately monitoring andevaluating specific human motion due to the mutual interference of the tensionand pressure. As the tension is difficult to be decoupled or eliminated fromthe coupling forces. Herein, the pre-stretchable conductive yarn (PCY) sensorwith pressure sensitivity but tension insensitivity was introduced to remove thedisturbance of tension. The PCY-based piezoresistive sensor exhibits tensioninsensitive (gauge factor of 0.11) but pressure sensitive (sensitivity of187.33 MPa-1). The fabric-based pressure sensor assembled with cross arrangedPCY weft and warp revealed magnified pressure sensitivity of the single PCYyarn sensor, as well as tension insensitive to strain and tensile angle.Moreover, it possessed benign cyclicityduring 5000 cycles of pressing/releasing. Therefore, the fabric piezoresistivesensor based on weaved conductive yarns is suitable for highly-accurate andlarge area pressure detection, such as monitoring massage intensity ofacupuncture point.

Ding Xincheng, et al. Highly Accurate Wearable Piezoresistive Sensors without Tension DisturbanceBased on Weaved Conductive Yarn. ACS Applied Materials & Interfaces, 2020, 12, 35638-35646.