Multilayer nanocomposite films with enhanced piezoelectric properties doping PZT nanofibers

Flexible electronics components, including wearable sensors , miniature energy supply devices, and energy harvesting systems based on polymer piezoelectric materials , have garnered extensive attention. This study focuses on the preparation of PZT nanofibers (PZT NFs) via electrospinning and their modification with polydopamine, the fabrication of PVDF/PZT NFs nanocomposite films through casting, and the production of tri-layer nanocomposite films using hot pressing. The alignment of the PZT NFs perpendicular to the electric field direction enhances the breakdown strength ( E b ) and facilitates the polarization of the nanocomposite films. At the interlayer interfaces within the tri-layer structure, electron traps extend the breakdown path, attenuating charge concentration and mitigating the electric field concentration effect. Consequently, the tri-layer films exhibit excellent electrical properties. Notably, the P4P tri-layer nanocomposite films have a high E b of 290.47 kV/mm and a piezoelectric coefficient of -24 pC/N. This paper presents a promising strategy for enhancing the piezoelectric properties of polymer piezoelectric materials applied in sensors and energy harvesting systems.