Piezoelectricity of PVDF composite film doped with dopamine coated nano-TiO2

In this work, dopamine (DA) coated nano-TiO2 (DA@TiO2) modified polyvinylidene fluoride (PVDF) piezoelectric composite films (DA@TiO2/PVDF) with a high beta-phase content are successfully fabricated by solvothermal method. The beta-phase content of the DA(2.0)@TiO2/PVDF reaches 84.33%. Furthermore, DA(2.0)@TiO2/ PVDF has the highest crystallinity (X-c) and melting enthalpy (Delta H). Due to synergistic effect between DA and TiO2, the piezoelectric coefficients (d(33)) and remnant polarization (P-r) of DA(2.0)@TiO2/PVDF composite films increase by up to 163% and 278% than that of the pure PVDF film, respectively. This work provides a new method to present promise in broadening nanometer preparation technology and improving performance of piezoelectric composites, and contributes to the study on new curved panel energy harvesters for aeroelastic vibration. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

In this study, dopamine-coated nano-TiO2 modified PVDF piezoelectric composite films with a high beta-phase content were successfully fabricated, exhibiting improved piezoelectric properties compared to pure PVDF films. The synergistic effect between dopamine and TiO2 significantly increased the piezoelectric coefficients and remnant polarization of the composite films.