Capacitive/Piezoelectric Dual-Mode Flexible Self-Powered Sensor Based on PVDF-TrFE- co -PEG Diamine@IL Nanofiber Membranes

To overcome the limitations of flexible sensors relying on external power supply and single-mode detection, this study proposes a self-powered flexible sensor based on PVDF-TrFE- co -PEG Diamine@ionic liquid nanofiber membrane. This sensor integrates capacitive and piezoelectric dual modes within a compact sandwich structure, enabling high-sensitivity static pressure detection and self-powered dynamic signal generation without requiring an external power source or mode switching. This sensor exhibits ultrahigh sensitivity (32.28 kPa –1, pressure < 12.5 kPa) in capacitive mode and can generate an open-circuit voltage as high as 1.51 V in piezoelectric mode, achieving efficient mechanical energy-to-electrical energy conversion. This will demonstrate broad application prospects in the fields of passive wearable electronics and electronic skin, providing a methodology for designing multifunctional integrated sensing systems.