Synthesis, Structural, Optical and Dielectric Properties of Nanostructured 0–3 PZT/PVDF Composite Films

Abstract

Nanostructured PbZr0.52Ti0.48O3 (PZT) powder was synthesized at 500 °C-800 °C using sol-gel route. X-ray diffraction and Rietveld analysis confirmed the formation of perovskite structure. The sample heat treated at 800 °C alone showed the formation of morphotropic phase boundary with coexistence of tetragonal and rhombohedral phase. The PZT powder and PVDF were used in 0-3 connectivity to form the PZT/PVDF composite film using solvent casting method. The composite films containing 10%, 50%, 70% and 80% volume fraction of PZT in PVDF were fabricated. The XRD spectra validated that the PZT structure remains unaltered in the composites and was not affected by the presence of PVDF. The scanning electron microscopy images show good degree of dispersion of PZT in PVDF matrix and the formation of pores at higher PZT loading. The quantitative analysis of elements and their composition were confirmed from energy dispersive X-ray analysis. The optical band gap of the PVDF film is 3.3 eV and the band gap decreased with increase in volume fraction of PZT fillers. The FTIR spectra showed the bands corresponding to different phases of PVDF (α, β, γ) and perovskite phase of PZT. The thermogravimetric analysis showed that PZT/PVDF composite films showed better thermal stability than the pure PVDF film and hydrophobicity. The dielectric constant was measured at frequency ranging from 1 Hz to 6 MHz and for temperature ranging from room temperature to 150 °C. The composite with 50% PZT filler loading shows the maximum dielectric constant at the studied frequency and temperature range with flexibility.

Enhancement of piezoelectric β‐polymorph formation and properties of graphene oxide and PZT‐incorporated in PVDF‐HFP matrix for energy harvesting applications

“…However, the intensity of the diffraction peak at 2 θ = 21.4° reflects the superposition of the (110) and (200). [ 42 ] A strongly visible crystalline plane (200) indicated that the composite's polar phase was confirmed. These results demonstrated that only 0.05 wt% of PZT/GO is required to nucleate the TT confirmation of the β‐phase in all PVDF‐HFP chains.…”

Flexible, Lead-Free Nanogenerators Using Poly(vinylidene fluoride) Nanocomposites

“…Both the PVDF and nanocomposites are stable up to 420 °C, and after this temperature, there is sudden loss of weight because of cleavage in polymer chains, arising from thermal degradation. 28 However, there is no change of degradation temperature in the composite as compared to pure PVDF. This is to mention that BT does not lose any weight up to 700 °C other than meager quantity of adsorbed water.…”

“…There is no weight loss around 100 °C in the nanocomposites, which shows their hydrophobic nature. Both the PVDF and nanocomposites are stable up to 420 °C, and after this temperature, there is sudden loss of weight because of cleavage in polymer chains, arising from thermal degradation . However, there is no change of degradation temperature in the composite as compared to pure PVDF.…”

Preparation and Property Enhancement of Poly(Vinylidene Fluoride) (PVDF)/Lead Zirconate Titanate (PZT) Composite Piezoelectric Films

“…[18][19][20][21][22] Currently, 0-3 PVDF/lead zirconate titanate (PZT) piezoelectric composites are mostly employed in research because of their superior properties, such as high permittivity and piezoelectric coefficient. [23][24][25][26][27][28] However, they are affected by many problems such as aggregation of fillers 29 and poor compatibility between the PVDF matrix and PZT fillers. To solve these problems, the surface modification of PZT particles to increase their dispersion and compatibility with PVDF has become a research hotspot.…”