PVDF-Based Piezoelectric Pressure Sensor for Wearable Throat-Motion Monitoring

Thin piezoelectric polymers provide a compliant route for converting transient biomechanical deformation into electrical signals, but wearable sensing also depends on how these high impedance signals are coupled to the electronic readout. This work presents a hybrid sensing platform that combines a piezoelectric film, an InSnZnO (ITZO) dual-gate thin-film transistor (DGTFT), and analog signal conditioning for dynamic force measurement and anterior neck motion sensing. The polymer film contains identifiable electroactive crystalline features and generates repeatable bipolar responses under cyclic loading. The coupled device exhibits gate-dependent drain current responses, while the complete readout provides a force-to-voltage sensitivity of 4.0 V/N over 0.5–1 N. Under continuous 0.5 N cyclic loading for 200 s, the output shows a 3.12% coefficient of variation and a 102.27% final-to-initial response ratio. Neck-mounted measurements further resolve different temporal signatures associated with coughing, swallowing, and pronunciation of “hello”. The results demonstrate a compact polymer-transistor sensing architecture that preserves dynamic mechanical information from controlled loading to wearable biomechanical acquisition.