High-Sensitive PDMS-Encapsulated P(VDF-TrFE) Pressure Sensor for Physiological Monitoring

Based on the remarkable piezoelectric properties of P(VDF-TrFE) developed, we report a skin-conformable flexible pressure sensor for human motion monitoring. This device with serpentine electrodes converts force signals at the skin surface into electrical signals, not only allowing the identification of motion states (e.g., walking and jumping), but also enabling precise detection of subtle physiological signals, such as pulse waves. The superior sensing performance stems from the$\mathrm{P}(\text{VDF}-\text{TrFE})$film fabricated via hot-pressing and annealing, significantly enhancing the piezoelectric$\beta$-phase content. Furthermore, the PDMS-encapsulated sensor exhibits a superior sensitivity of$28.5 \text{mV} \text{kPa}{ }^{-1}$. This fabrication process enables customizable patterning and scalable production of wearable pressure sensors.