Enhancement of dielectric and ferroelectric properties in cobalt ferrite doped poly(vinylidene fluoride) multiferroic composites

Ganesan, Shanthi; Jatav, Sanjay; Rao, M. S. Ramachandra; Satapathy, Dillip K.

doi:10.1088/2053-1591/aa7109

Cited by 16 publications

(11 citation statements)

References 56 publications

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“…Micron to submicron sized grains were observed in the β phase along with the presence of a few pores which can be seen clearly from Figure b. A similar morphology for the β phase was observed in our previous work where PVDF film was prepared at 70 °C . At low temperatures due to the slow rate of evaporation of solvent, the formation of pores becomes favorable because of vapor-induced phase separation which leads to the formation of incomplete crystallites …”

Section: Resultssupporting

confidence: 81%

“…A similar morphology for the β phase was observed in our previous work where PVDF film was prepared at 70 °C. 35 At low temperatures due to the slow rate of evaporation of solvent, the formation of pores becomes favorable because of vaporinduced phase separation which leads to the formation of incomplete crystallites. 36 Atomic force microscopy (AFM) further reveals the surface topography of different polymorphs of PVDF at high spatial resolution.…”

Section: ■ Resultsmentioning

confidence: 99%

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Influence of Microstructure on the Nanomechanical Properties of Polymorphic Phases of Poly(vinylidene fluoride)

et al. 2018

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Poly(vinylidine fluoride) (PVDF) is a semicrystalline polymer which is known to exist in several polymorphic phases, namely, α, β, and γ. Each one of these polymorphic phases is characterized by unique features such as spherulite formation in the case of the α and γ phases and the presence of large piezoelectric and ferroelectric activity in the β phase. Despite being widely used as thin coatings in sensors, lack of reports on nanomechanical properties suggests that investigation of mechanical properties of PVDF, let alone those of its polymorphic phases, seems to have evaded the sight of the research community. Herein, we report the nanomechanical properties of the α, β, and γ phases of PVDF. The modulus and hardness values were evaluated from nanoindentation experiments; it was found that the electroactive β phase is the softest among the three polymorphic phases. This result was further confirmed by scratch experiments. We have attempted to establish a correlation between the microstructure and nanomechanical properties of these phases. This work sheds light on the mechanisms responsible for the observed mechanical behavior and the role of tie molecules and amorphous content in providing flexibility to the polymer.

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Section: Resultssupporting

confidence: 81%

Section: ■ Resultsmentioning

confidence: 99%

Influence of Microstructure on the Nanomechanical Properties of Polymorphic Phases of Poly(vinylidene fluoride)

et al. 2018

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“…P r also decreases with increasing of ferrite constituent in the composite, which is probably connected with dielectric loss increase and heterogeneous conduction between ferroelectric and ferromagnetic interfaces [23]. Usually, PVDF must be subjected to very high electric field intensities (around 1200-1500 kV/cm) for observing saturation of polarization [24]. Having in mind that α-PVDF, among other PVDF phases is inactive nonpolar, it does not exhibit ferroelectric behavior.…”

Section: Resultsmentioning

confidence: 99%

PZT–NZF/CF ferrite flexible thick films: Structural, dielectric, ferroelectric, and magnetic characterization

et al. 2019

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The preparation and properties of thick flexible three-phase composite films based on lead zirconium titanate (PZT) and various ferrites (nickel zinc ferrite (NZF) and cobalt ferrite (CF)) were reported in this study. Properties of three-phase composite films were compared with pure polyvinylidene fluoride (PVDF) and PZT-PVDF films. X-ray diffraction data indicated the formation of well crystallized structure of PZT and NZF/CF phases, without the presence of undesirable phases. Scanning electron micrographs showed that the ceramic particles were dispersed homogeneously in the PVDF matrix and atomic force microscopy confirmed that the size of the particles is around 30 nm. Non-saturated hysteresis loops were evident in all samples due to the presence of highly conductive ferrite phases. Under magnetic field of 10 kOe, composite films exhibited a typical ferromagnetic response. Dielectric properties were investigated in the temperature range from-128 to 250 ℃ and frequency range of 400 Hz-1 MHz. The results showed that the value of dielectric constant of the PVDF/PZT/ferrite composites increased about 25% above the one obtained for pure PVDF.

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“…Therefore, from XRD characterization, it was evident that the neat PVDF film predominantly exhibits the nonpolar α phase with monoclinic TG + TG − chain conformation. [ 23 ] This was mainly due to the fact that the TG + TG − chain conformation of PVDF is energetically more stable than the other possible phases of it. But, as the α phase is nonpolar with zero dipole moment, α ‐PVDF exhibits very weak electrical performance.…”

Section: Resultsmentioning

confidence: 99%

“…[ 23 ] This could be explained on the basis of induced polymorphism of PVDF after filler addition. [ 23 ] Detail quantitative phase analysis of the PVDF‐based composite films and their crystallinity can be achieved by deconvolution of characteristic PVDF peak in the 2 θ region of 10°–30°. But in the present case, almost all the fillers exhibited crystalline peak ≈ 2 θ = 22°–26°.…”

Section: Resultsmentioning

confidence: 99%

Influence of Various Physiochemical Parameters of AFeO₃ (A = Bi, Er, Ga, La, Sm, Y) Fillers on the Dielectric, Ferroelectric, Energy Storage, and Mechanical Energy Harvesting Performance of PVDF

Sasmal

Devi

Sen

2022

Macro Materials & Eng

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Different filler particles are very often used by researchers all over the world to tune the dielectric, ferroelectric, piezoelectric, energy storage, and energy harvesting properties of poly(vinylidene fluoride) (PVDF). In the present work, different perovskite ferrites, AFeO 3 (A = Bi, Er, Ga, La, Sm, and Y), are included into PVDF matrix separately. The roles of different parameters like, particle size, dielectric permittivity, ferroelectric polarization, crystal structure, etc. of the fillers in tuning the performance of respective PVDF-based composites are comprehensively and simultaneously studied here. Non-centrosymmetric fillers are found to improve the output performances of PVDF more effectively compared to that of centrosymmetric fillers. 5 wt% BiFeO 3 -loaded PVDF film (5BF) shows the best performance in all aspects. Upon repeated human finger tapping, the maximum instantaneous output power density and instantaneous current across a 10 MΩ resistor connected across the 5BF film are found to be ≈3 μW cm −2 and 1.25 μA, respectively. The rectified voltage from 5BF nanogenerator is used to charge a 10 μF commercial capacitor up to ≈2.8 V and lights up some LEDs as a part of its real life applicability. The fabricated nanogenerator also shows good vibration and pressure sensing ability.

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Enhancement of dielectric and ferroelectric properties in cobalt ferrite doped poly(vinylidene fluoride) multiferroic composites

Cited by 16 publications

References 56 publications

Influence of Microstructure on the Nanomechanical Properties of Polymorphic Phases of Poly(vinylidene fluoride)

Influence of Microstructure on the Nanomechanical Properties of Polymorphic Phases of Poly(vinylidene fluoride)

PZT–NZF/CF ferrite flexible thick films: Structural, dielectric, ferroelectric, and magnetic characterization

Influence of Various Physiochemical Parameters of AFeO₃ (A = Bi, Er, Ga, La, Sm, Y) Fillers on the Dielectric, Ferroelectric, Energy Storage, and Mechanical Energy Harvesting Performance of PVDF

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Enhancement of dielectric and ferroelectric properties in cobalt ferrite doped poly(vinylidene fluoride) multiferroic composites

Cited by 16 publications

References 56 publications

Influence of Microstructure on the Nanomechanical Properties of Polymorphic Phases of Poly(vinylidene fluoride)

Influence of Microstructure on the Nanomechanical Properties of Polymorphic Phases of Poly(vinylidene fluoride)

PZT–NZF/CF ferrite flexible thick films: Structural, dielectric, ferroelectric, and magnetic characterization

Influence of Various Physiochemical Parameters of AFeO3 (A = Bi, Er, Ga, La, Sm, Y) Fillers on the Dielectric, Ferroelectric, Energy Storage, and Mechanical Energy Harvesting Performance of PVDF

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Influence of Various Physiochemical Parameters of AFeO₃ (A = Bi, Er, Ga, La, Sm, Y) Fillers on the Dielectric, Ferroelectric, Energy Storage, and Mechanical Energy Harvesting Performance of PVDF