P(VDF-TrFE) Piezoelectric Film-Based Wearable Sensors for Force Monitoring

This paper reports a wearable P(VDF-TrFE) thin film pressure sensor for force monitoring, termed the WPFB sensor. The sensor uses PVDF-TrFE film, which is more suitable for wearable devices than traditional piezoelectric ceramics due to its low cost, high flexibility and biocompatibility. We use plasma and annealing to act on the PVDF film to improve the piezoelectric response. This sensor can convert mechanical energy into electrical energy with a voltage sensitivity of 0.1525 V/N. This piezoelectric response is 2.25 times better than the results from commercial pressure sensors. Experimental results show that piezoelectric devices can detect pressure changes. In the future we will aim at pulse detection, which offers broad prospects for detecting the early onset of cardiovascular disease and assessing personal health.