Wearable piezoelectric device assembled by one-step continuous electrospinning

摘要

A lightweight wearable piezoelectric membrane device with excellent flexibility and air breathability is assembled for the first time using a one step continuous electrospinning method. The piezoelectric membrane device displays a three-layer structure in which the PVDF nanofiber membrane is sandwiched between two PVDF-rGO electrode membranes. Since the whole piezoelectric device is prepared by electrospinning, both the active layer and electrode layer have high levels of electroactive beta-phase crystallinity. The as-prepared device demonstrates high electric output. Open-circuit voltage, short-circuit current and power density can reach up to 46 V, 18 mu A and 18.1 mu W cm(-2), respectively. The electric output is remarkably affected by the frequency and magnitude of the exerted excitation force, specifically, the output demonstrates a linear relationship with the excitation force. Moreover, the piezoelectric membrane device demonstrates a long working stability of over 50 000 cycles and is capable of lighting LEDs directly.