Enhancing pyroelectric and ferroelectric properties of PVDF composite thin films by dispersing a non-ferroelectric inclusion La2O3 for application in sensors

Gan, Wee Chen; Majid, W.H. Abd.

doi:10.1016/j.orgel.2015.07.027

Cited by 12 publications

(6 citation statements)

References 30 publications

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“…Our membrane has values of P max = 12.2 µC/cm 2 and remnant polarization P r = 2.3 µC/cm 2 at a maximum applied field of 1200 kV/cm. The remnant polarization of the membrane is significantly below from that reported previously 5, 10 , maybe due to the coexistence of α and δ phases, the lower applied maximum field compared to those of references 5, 10 or both. Thus, the applied field of 1200 kV/cm could be sufficient to reorient the individual dipole moments of the cell of α-phase, but not enough to stabilize the parallel configuration, as the α cell recover its non-ferroelectric antiparallel configuration when the field vanishes to zero.…”

Section: Resultscontrasting

confidence: 67%

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Ferroelectric-Paraelectric Transition In A Membrane With Quenched-Induced δ-Phase Of PVDF

García-Zaldívar

Escamilla-Díaz

Ramírez-Cardona

et al. 2017

Sci Rep

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The stabilization of δ-phase of poly(vinylidene fluoride) PVDF in a 14 µm-thickness ferroelectric membrane is achieved by a simple route based on the use of a dimethylformamide (DMF)/acetone solvent, in which the application of external electric field is not required. X-ray diffraction and calorimetric experiments on heating reveal that, at 154 °C, the original mixture between ferroelectric δ-phase and paraelectric α-phase transits to a system with only this latter phase in the crystalline fraction. A gradual and slight increment of amorphous fraction up to the melting at 161 °C is also observed. The existence of δ-phase is corroborated by the occurrence of a broad maximum around 154 °C in dielectric permittivity measurements, as well as the hysteresis loops observed at room temperature. These results suggest a wide thermal window for a stable δ-phase, between room temperature and 154 °C, a subsequent transition into α-phase and the corresponding melting at 161 °C. The broad dielectric maximum observed around 154 °C in dielectric and calorimetric measurements, can be associated with a diffuse ferroelectric-paraelectric transition.

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Section: Resultscontrasting

confidence: 67%

“…There are three polymorphs, α, β, and γ, which have been studied extensively and another phase, less studied, called δ 3, 4 . Except α-phase, all others exhibit ferroelectric order 3, 5 .…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric-Paraelectric Transition In A Membrane With Quenched-Induced δ-Phase Of PVDF

García-Zaldívar

Escamilla-Díaz

Ramírez-Cardona

et al. 2017

Sci Rep

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“…This may be due to a lack of instrumental sensitivity at the relatively low electric fields used here. For instance, coercive fields of PVDF films have been reported in ranges larger than 300 kV/cm, − while the maximum field applied in the present work is only 100 kV/cm when applying 100 V (the maximum voltage allowed in the LC device) in the thinnest prepared films. In other words, although the main phase in PVDF–Mg(NO 3 ) 2 ·6H 2 O is the β-phase, which is a needed requirement for getting a ferroelectric behavior, it seems that the low sensitivity of the instrumental conditions do not allow to observe a ferroelectric loop in the P – E plots of that samples.…”

Section: Resultsmentioning

confidence: 56%

Dielectric Behavior and Electro-Magnetic Coupling at Room Temperature in BiFeO₃/PVDF and CoFe₂O₄/PVDF Composites

Medina

2017

J. Phys. Chem. C

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The dielectric properties of composites formed by dispersions of two types of ceramic particles, BiFeO 3 (multiferroic) and CoFe 2 O 4 (magnetic), in poly(vinylidene fluoride), PVDF, (which can present a ferroelectric phase) were studied at room temperature as a function of particle concentration. The characterization studies include determination of dielectric polarization curves in the presence of external magnetic fields, H (that is, P−E plots in the presence of H, where P is the dielectric polarization and E the external applied electric field). Impedance spectroscopy analysis shows the presence of several distributions of dipolar relaxation processes, some of which are assigned to charge rearrangements at the different interfaces of the system, for example at the ceramic-polymer interfaces. Negative magneto-electric coupling was observed at low ceramic proportion (where leakage currents are lower than 20 nA/cm 2 ), that is, decrease of P when applying H, < ∂ ∂

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“…Spin-coating is a common approach in the deposition of nanocomposite thin films before energy harvesting and energy storage applications. To fabricate a thermal or infrared sensor, a material must have excellent ferroelectric properties, high pyroelectric constant, low dielectric loss, and low specific heat and thermal conductivity [14,15].…”

Section: Introductionmentioning

confidence: 99%

Properties of Nanogenerator Materials for Energy-Harvesting Application

Majid,

Ahmad,

Rosli

et al. 2023

J. Res. Updates Polym. Sci.

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Advancements in nanotechnology and materials science have led to the development of a variety of nanogenerator materials with improved properties, making energy harvesting technologies increasingly viable for various applications, such as powering wearable devices, remote sensors, and even small electronic gadgets in the future. The evolution of hybrid materials consisting of polymers and nanoparticles as efficient energy harvesters and energy storage devices is in high demand nowadays. Most investigations on organic ferroelectric P(VDF-TrFE) as a polymer host of polymer nanocomposite devices were primally focused on the β phase due to its excellent electrical properties for various application purposes. Nanofiller is also introduced into the polymer host to produce a polymer nanocomposite with enhanced properties. A brief description of various physical quantities related to ferroelectric, dielectric, pyroelectric effects and Thermally Stimulated Current (TSC) for energy harvesting applications in nanogenerator materials is presented. This article explores the different materials and uses of various nanogenerators. It explains the basics of the pyroelectric effect and the structure of pyroelectric nanogenerators (PNGs), as well as recent advancements in micro/nanoscale devices. Additionally, it discusses how the performance of ferroelectric, dielectric, pyroelectric, and TSC are impacted by the annealing treatment of P(VDF-TrFE) polymer.

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Enhancing pyroelectric and ferroelectric properties of PVDF composite thin films by dispersing a non-ferroelectric inclusion La2O3 for application in sensors

Cited by 12 publications

References 30 publications

Ferroelectric-Paraelectric Transition In A Membrane With Quenched-Induced δ-Phase Of PVDF

Ferroelectric-Paraelectric Transition In A Membrane With Quenched-Induced δ-Phase Of PVDF

Dielectric Behavior and Electro-Magnetic Coupling at Room Temperature in BiFeO₃/PVDF and CoFe₂O₄/PVDF Composites

Properties of Nanogenerator Materials for Energy-Harvesting Application

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Enhancing pyroelectric and ferroelectric properties of PVDF composite thin films by dispersing a non-ferroelectric inclusion La2O3 for application in sensors

Cited by 12 publications

References 30 publications

Ferroelectric-Paraelectric Transition In A Membrane With Quenched-Induced δ-Phase Of PVDF

Ferroelectric-Paraelectric Transition In A Membrane With Quenched-Induced δ-Phase Of PVDF

Dielectric Behavior and Electro-Magnetic Coupling at Room Temperature in BiFeO3/PVDF and CoFe2O4/PVDF Composites

Properties of Nanogenerator Materials for Energy-Harvesting Application

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Dielectric Behavior and Electro-Magnetic Coupling at Room Temperature in BiFeO₃/PVDF and CoFe₂O₄/PVDF Composites