Tuning of highly piezoelectric bismuth ferrite/PVDF-copolymer flexible films for efficient energy harvesting performance

BiFeO3 (BFO) is a popular multiferroic material exhibiting robust antiferromagnetic and ferroelectric properties and is a promising candidate for use in sensors and transducers. In this work, BFO piezoceramics were synthesized by a simple hydrothermal method and were incorporated into the copolymers PVDF-TrFE and PVDF-HFP to fabricate flexible nanocomposite films. BFO nanoparticles (NPs) act as nucleating agent inside the polymer matrix, thus improving the overall performance of the piezoelectric film. The phase purity of the synthesized BFO NPs was confirmed by XRD and the beta-phase content of the fabricated film was calculated from FTIR analysis. The nanocomposite film PVDF-TrFE/BFO with 6 wt% filler loading (PTB6) showed better piezoelectric performance among others. The intrinsic functional properties of the composite film were evaluated by P-E (polarization-electric field) hysteresis loop test. Further, the nanocomposite film, after corona poling, was used for fabrication of a flexible piezoelectric nanogenerator (PNG). The poled films exhibited better piezoelectric as well as dielectric properties. The fabricated PTB6 based PNG generated a maximum of 18.5 V under a biomechanical finger tapping force. This study suggests that the proposed flexible device is a potential candidate for driving low-power electronic devices.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

In this study, BFO piezoceramics were synthesized using a simple hydrothermal method and incorporated into flexible nanocomposite films. Results showed that the addition of BFO nanoparticles improved the piezoelectric performance of the films, and corona poling further enhanced their properties.