Highly\nSensitive Fiber Pressure Sensors over a Wide\nPressure Range Enabled by Resistive-Capacitive Hybrid Response

Abstract

Soft capacitive pressure sensors\nwith high performance are becoming\nincreasingly in demand in the emerging flexible wearable field. While\ncapacitive fiber pressure sensors have achieved high sensitivity,\ntheir sensitivity range is limited to low-pressure levels. As fiber\nsensors typically require preloading and fixation, this narrow range\nof high sensitivity poses a challenge for practical applications.\nTo overcome this limitation, the study proposes resistive-capacitive\nhybrid response fiber pressure sensors (HFPSs) with three-layer core–sheath\nstructures. The trigger and sensitivity enhancement mechanisms of\nthe hybrid response are determined through model analysis and experimental\nverification. By adjustment of the sensitivity enhancement range of\nthe hybrid response, the sensitivity attenuation of HFPSs is alleviated\nsignificantly. The obtained results demonstrate that HFPSs have excellent\ncharacteristics such as fast response, low hysteresis, wide response\nfrequency, small signal drift, and good durability. The hybrid response\nenhances the practical sensitivity of HFPSs for various applications.\nWith enhanced sensitivity, HFPSs can effectively monitor pulse signals\nat preloads ranging from 0 to 22.7 kPa. This wide range of preloads\nimproves the fault tolerance of pulse monitoring and expands the potential\napplication scenarios of fiber pressure sensors.