Preparation of efficient piezoelectric PVDF–HFP/Ni composite films by high electric field poling

Abstract

Poly(vinylidene fluoride) (PVDF) and its copolymers have been widely studied due to their excellent piezoelectricity and ferroelectricity. In this study, composite films are prepared by adding Ni nanoparticles (0.00–0.3 wt%) into poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF–HFP) matrix by solution casting, uniaxial stretching, and high electric field poling. It is found that when the maximum electric field E max for poling is 130 MV m−1, the calibrated open circuit voltage of the pure PVDF–HFP films reaches 3.12 V, which is much higher than those poled by a lower electric field (70 MV m−1: 1.40 V; 90 MV m−1: 2.29 V). This result shows that the effect of poling on the generated output voltage is decisive. By adding 0.1 wt% Ni nanoparticles, it increases to 3.84 V, 23% higher than that of the pure PVDF–HFP films. To further understand the enhancement mechanism, the effects of Ni nanoparticles on initial crystallization, uniaxial stretching, and high electric field poling are investigated by X-ray diffraction, scanning electron microscope, Fourier transform infrared spectroscopy, and differential scanning calorimetry.

Full and In Situ Printing of Nanogenerators that Are Based on an Inherently Viscous Piezoelectric Polymer: An Effort to Minimize “Coffee Ring Effect” and Nonprinting Operations

“…In summary, Figure suggests that under our in situ fabrication conditions, annealing alone promoted the formation of a small amount of PVDF β phase and the subsequent electric poling resulted in a significantly increased β phase fraction. As a matter of fact, for PVDF, electric poling-induced transition from the α to β phase, as confirmed by XRD and/or FTIR analyses, has been widely reported. − …”

Recent Progress on Structure Manipulation of Poly(vinylidene fluoride)‐Based Ferroelectric Polymers for Enhanced Piezoelectricity and Applications

“…[ 178 ] Additionally, the poling process can cause a reduction in crystallinity. [ 179 ] Thus, careful manipulation of the bulk structure of PVDF‐based polymers and poling parameters is essential to achieve optimal piezoelectric properties. It is noted that not all PVDF‐based nanocomposites require a poling process to exhibit piezoelectricity.…”

Smart Biomaterials in Biomedical Applications: Current Advances and Possible Future Directions

“…[ 88 ] PVDF‐HFP solid electrolyte and self‐healing structure redistribute the structural mass in response to dynamic loads due to the piezoelectricity to convert mechanical energy into electrical energy. [ 89 ] These materials showing electromechanical behavior can be guided by physiological electrical changes to increase automated mechanical prompts. Direct and mutual piezoelectric impacts that permit tension on mechanical deformation are seen in a tension application.…”