Single-step fabrication of organic nanofibrous membrane for piezoelectric vibration sensor

A modified electrospinning setup with parallel electrode and heater plate was presented to fabricate piezoelectric nanofibrous membrane directly. Thanks to the strong electric field strength, high stretch ratio and high environmental temperature during the electrospinning process, α-phase poly (vinylidene fluoride) (PVDF) would be transformed to β-phase well and have excellent piezoelectric performance. The maximal piezoelectric output voltage increased from 100 mV to 300 mV with increasing excitation frequency from 5 Hz to 1000 Hz, and the noise in the piezoelectric response decreased with increasing excitation frequency. This work would promote the application of polymeric sensor in the NEMS/MEMS system integration.