Modulation in polymer properties in PVDF/BCZT  composites with ceramic content and their energy density capabilities

Garg, Tarun; Annapureddy, Venkateswarlu; Sekhar, K. C.; Jeong, Dae‐Yong; Dabra, Navneet; Hundal, Jasbir S.

doi:10.1002/pc.25795

Cited by 37 publications

(35 citation statements)

References 71 publications

(195 reference statements)

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“…The XRD results confirmed the formation of an α-phase and γ-phase with traces of a β-phase with meltpressing and solution-casting, respectively. 5,8,18,24,27,43 These results were in good agreement with FTIR results of pure PVDF films.…”

Section: X-ray Diffraction (Xrd) Studiessupporting

confidence: 87%

“…Glacial acetic acid was added as a chelating agent. 45,46 On drying the precursor solution the obtained white solids were crushed and annealed at 1000°C for 4-5 h. 33,43,45,46…”

Section: Experimental Synthesis and Characterizationmentioning

confidence: 99%

“…The as-prepared dried film was used for further analysis and testing. 9,18,[25][26][27]33,43 b) Melt-Pressing: For comparative studies of the processing temperature, pure PVDF and PVDF/BCZT composite films with 40 wt.%, 50 wt.% and 60 wt.% of BCZT were synthesized by melt-pressing. The BCZT powder and PVDF taken in different wt.% ratios were mixed and ground using a mortar and pestle.…”

Section: Pure Pvdf and Pvdf/bczt Composite Filmsmentioning

confidence: 99%

“…The ferroelectric PVDF/BCZT composites are widely studied for energy storage related applications. 1,2,29,43 The addition to BCZT particles in PVDF matrix has enhanced the electric response of the composite films which is most desirable in flexible electronics.…”

Section: Dielectric Propertiesmentioning

confidence: 99%

“…41 Because of the high permittivity, good polarization and large energy density, the BCZT ceramics are also studied for energy storage purposes. 27,40,42,43 In this article, the as-synthesized BCZT ceramic particles with composition 0.5((Ba 0.7 Ca 0.3 )TiO 3 )-0.5(Ba(Zr 0.2 Ti 0.8 )O 3 ) were dispersed in the PVDF matrix to enhance the electric properties of the polymer. The purpose is to integrate the enhanced electric properties of BCZT ceramic with the flexibility of PVDF polymer via a proper fabrication technique to form a suitable flexible electroactive material.…”

Section: Introductionmentioning

confidence: 99%

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Dielectric Properties and Phase Stabilization of PVDF Polymer in (1−x)PVDF/xBCZT Composite Films

Garg

Annapureddy

Sekhar

et al. 2021

J. Electron. Mater.

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Polyvinylidene fluoride (PVDF) is a semi-crystalline ferroelectric polymer which can be stabilized in its distinct electroactive polymorphs α and γ by selective processing techniques. In this article, to study the effect of processing temperature and barium calcium zirconium titanate (BCZT) ceramic-doping on PVDF phase stabilization, the pure PVDF and PVDF/BCZT composite films were fabricated by solution-casting and melt-pressing. The Fourier-transform infrared spectroscopy and x-ray diffraction studies showed that the pure PVDF and PVDF/BCZT composite films fabricated by solution-casting possessed the characteristic γ-PVDF peaks while melt-pressing stabilized PVDF mostly in the α-phase. The BCZT ceramic particles were found to have no significant effect on PVDF phase stabilization, but it enhanced the overall crystallinity of polymer matrix. The dielectric studies revealed that the relative permittivity (ε r ) of γ-and α-PVDF phases in pure PVDF film samples was ≈ 10 and 7.5 (at 120 Hz) respectively. The ε r of PVDF/BCZT composite films having 50 wt.% BCZT content synthesized by solution-casting and melt-pressing were estimated to be ≈ 31 and 20 (at 120 Hz), respectively, which was about three times that of pure PVDF film synthesized by the respective technique. The value of loss tangent (tanδ) for pure PVDF films synthesized by solution-cast and melt-press technique were ≈ 0.07 and 0.35 (at 120 Hz) respectively. In temperature-dependent dielectric studies, γ-PVDF showed distinct α-relaxation peak at ≈ 120°C and polymer melting at temperature > 130°C. For α-PVDF, the increase in ε r and tanδ was observed during α-relaxation transition at higher temperatures. The dielectric studies indicated that the introduction of BCZT ceramic particles in PVDF matrix increased the ε r -value by enhancing the dipolar and interfacial polarizations in composites, while the decrease in tanδ-value was observed due to decrease in molecular dipoles with a decrease in wt.% of PVDF content. These phenomena collectively improved the overall electric properties of ceramic/polymer composites which makes them suitable candidates to explore for flexible electroactive material form.

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Section: X-ray Diffraction (Xrd) Studiessupporting

confidence: 87%

“…Glacial acetic acid was added as a chelating agent. 45,46 On drying the precursor solution the obtained white solids were crushed and annealed at 1000°C for 4-5 h. 33,43,45,46…”

Section: Experimental Synthesis and Characterizationmentioning

confidence: 99%

Section: Pure Pvdf and Pvdf/bczt Composite Filmsmentioning

confidence: 99%

Section: Dielectric Propertiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Dielectric Properties and Phase Stabilization of PVDF Polymer in (1−x)PVDF/xBCZT Composite Films

Garg

Annapureddy

Sekhar

et al. 2021

J. Electron. Mater.

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Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Muduli

Parida

Behura

et al. 2022

Polymers for Advanced Techs

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Piezoelectric energy harvester has attracted considerable attention as an independent power source for applications in biocompatible, implantable, and flexible electronic devices. However, the lacuna of getting enhanced piezoelectric response from flexible lead‐free polymer‐based composite persists in this field. Here, we present a detailed study on the electrical characteristics such as dielectric, ferroelectric, and piezoelectric properties of (PVDF)‐[0.5Ba(Zr0.2Ti0.8)O3–0.5(Ba0.7Ca0.3)TiO3]‐graphene oxide (GO) three‐phase composite films synthesized by solvent‐casting followed by a hot pressing method. Structural investigations reveal that the fraction of β‐phase of PVDF in all the composites is more than 65%. The dielectric constant of the composite increases up to the threshold value (0.16 wt% for GO and 0.08 wt% for rGO), and further loading causes a decrease in the dielectric constant. The composite with GO concentration of 0.16 wt% (G‐0.16) shows a dielectric constant of 25.6 with a loss tangent of 0.0498. In contrast, composite with reduced graphene oxide (rGO) concentration of 0.08 wt% (R‐0.08) are 24.3 and 0.0681, respectively, at 1 kHz. Remnant polarization and d33 value of G‐0.16 are 0.012 μC cm−2 and 11 pC N−1, respectively, which are six times and four times more than pure PVDF. The piezoelectric harvester from G‐0.16 produces an open‐circuit voltage of ~4 V and a short‐circuit current of ~1.6 μA with simple hand tapping, which is the highest among the compositions, makes it a suitable candidate for piezoelectric energy harvesting applications.

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Low‐frequency nanocomposite piezoelectric energy harvester with embedded zinc oxide nanowires

Meschino

Wang

et al. 2021

Polymer Composites

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Sweeping developments in microelectromechanical systems and low power electronics have pushed the need for piezoelectric energy harvesters (PEHs).Increasing environmental and biocompatibility issues have drawn interest in lead-free piezoelectric materials. In this paper, cantilever-type PEHs at centimeter scale have been proposed to harvest the energies of low-frequency vibrations caused by a human's movements. The proposed PEHs are made of a

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Modulation in polymer properties in PVDF/BCZT composites with ceramic content and their energy density capabilities

Cited by 37 publications

References 71 publications

Dielectric Properties and Phase Stabilization of PVDF Polymer in (1−x)PVDF/xBCZT Composite Films

Dielectric Properties and Phase Stabilization of PVDF Polymer in (1−x)PVDF/xBCZT Composite Films

Synergistic effect of graphene on dielectric and piezoelectric characteristic of PVDF‐(BZT‐BCT) composite for energy harvesting applications

Low‐frequency nanocomposite piezoelectric energy harvester with embedded zinc oxide nanowires

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