Flexible capacitive pressure sensor based on carbon black-barium titanate/polyurethane

With the rapid development and application of smart wearable flexible electronic technology in biomedicine, electronic skin, human-computer interaction and other fields, the research demand of flexible pressure sensors with high sensitivity and wide detection range has been put on the agenda. In this paper, a carbon black-barium titanate (CB-BTO)/PU flexible capacitive pressure sensor was prepared by using the polyurethane sponge (PU) as the base and combining CB-BTO/BTO composite material on the polyurethane sponge by ultrasonic dipping coating. After testing, the sensor combines high sensitivity (~0.7911 kPa⁻¹) and wide detection range (0-300 kPa). At the same time, the response time, the minimum detection limit and the stability of the sensor are studied. In addition, the sensor has been tested in four different pressure ranges, which verifies the potential of the sensor in high sensitivity and wide detection range, and provides a new possibility for low-cost and large-scale fabrication of high-performance flexible sensors.