Abstract:

In order to obtain eco-friendly, flexible, permeable and piezoelectric materials and to widen applications thereof in nanogenerators, sensors and wearable electronic devices, the high piezoelectric ZnO/PVDF composite fibrous membranes were successfully prepared by electrospinning. The morphology, structure and piezoelectricity of samples were characterized by the scanning electron microscope, attenuated total reflectance fourier transform infrared spectroscopy, X-ray diffraction and oscilloscope. The results demonstrate that the addition of appropriate contents of zinc oxide nano-particles (ZnO NPs) in PVDF fiber matrix contributes to improving crystallinity and electroactive β cuystal form concentration of PVDF fiber to some extent, leading to the increase of the total crystal form of PVDF. Meanwhile, ZnONPs have piezoelectricity, which further enhances the piezoelectric performances of the composites. The output voltage of the ZnO/PVDF composite fibrous membranes are improved dramatically. The output voltage of the composite membrane is up to 60V when the content of ZnONPs is 30%, which is increased by 200% in comparison with pure PVDF fibers.

Key words: electrospenning, zinc oxide, poly (vinylidene fluoride), piezoelectricity, composite fibrous membrane