Intrinsically temperature-insensitive flexible pressure sensor based on polyvinyl chloride/carbon black composites

Due to the temperature sensitivity typically exhibited by conductive polymer composites (CPCs), changes in the ambient temperature can seriously affect the measurement accuracy of flexible pressure sensors. Therefore, realizing CPC-based flexible pressure sensors with good resistance to temperature changes is an urgent problem. Herein, a polyvinyl chloride/carbon black (PVC/CB) conductive composite with a resistance temperature coefficient approaching zero (-0.0077%°C -1 in the temperature range of 25–55°C) is developed to successfully prevent the changes in resistance that conductive composite materials typically undergo with temperature fluctuation. PVC/CB functional paste is used to prepare the pressure-sensitive layer of the micro-flexible pressure sensor by screen printing method. The performance of this sensor is not affected by temperature, and it exhibits a high sensitivity of 0.514 kPa -1 , a rapid response time (15 ms), and good stability. These research results provide new ideas for the design and preparation of CPC-based flexible sensors, promoting their application in wearable devices, medical monitoring, aerospace, and other fields.