Fabrication, characterization, properties and theoretical analysis of ceramic/PVDF composite flexible films with high dielectric constant and low dielectric loss

Luo, Bing; Wang, Xiaohui; Wang, Yueping; Li, Longtu

doi:10.1039/c3ta14107a

Cited by 397 publications

(202 citation statements)

References 38 publications

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“…The modified Rother-Lichtenecker model [38,42] based on the Rother-Lichtenecker equation is a representation of a logarithmic law of mixing for a chaotic or statistical mixture, as shown in Eqn. (7):…”

Section: Fig 6 Effect Of Bt Content On the Dielectric Constant Of Smentioning

confidence: 99%

“…In order to improve understanding of the dielectric behaviour of DEs, several mixing rules [1,[38][39][40][41] have been proposed for simulating the dielectric constant (ε′) of polymer composites which comprise the isotropic dielectric matrix (dielectric constant ε 1 ′, volume fraction υ 1 ), filled with dielectric spheroids (dielectric constant ε 2 ′, volume fraction υ 2 = 1 -υ 1 ). The following equations are used to express the relations between the dielectric constant of DEs and the volume fraction of spherical fillers in DEs:…”

Section: Fig 6 Effect Of Bt Content On the Dielectric Constant Of Smentioning

confidence: 99%

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The fabrication of dielectric elastomers from silicone rubber and barium titanate: employing equi-biaxial pre-stretch to achieve large deformations

Jiang¹,

Betts²,

Kennedy³

et al. 2015

J Mater Sci

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Section: Fig 6 Effect Of Bt Content On the Dielectric Constant Of Smentioning

confidence: 99%

Section: Fig 6 Effect Of Bt Content On the Dielectric Constant Of Smentioning

confidence: 99%

The fabrication of dielectric elastomers from silicone rubber and barium titanate: employing equi-biaxial pre-stretch to achieve large deformations

Jiang¹,

Betts²,

Kennedy³

et al. 2015

J Mater Sci

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“…Therefore, to predict the dielectric constant of the PVDF-KNN nano and micro crystal composites, various models were used and these are given below. According to the Maxwell and Garnett model, the effective dielectric constant ( r  ) of a composite comprising randomly dispersed crystallites having spherical morphology associated with a relatively high dielectric constant [42,59] is given by…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Effect of nano- and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

2016

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Polymer nanocrystal composites were fabricated by embedding polyvinylidene fluoride (PVDF) with K 0.5 Na 0.5 NbO 3 (KNN) nanocrystallites of different volume fraction using the hot-pressing technique. For comparison, PVDF-KNN microcrystal composites of the same compositions were also fabricated which facilitated the studies of the crystallite size (wide range) effect on the dielectric and piezoelectric properties. The structural, morphological, dielectric, and piezoelectric properties of these nano and micro crystal composites were investigated. The incorporation of KNN fillers in PVDF at both nanometer and micron scales above 10 vol% resulted in the formation of polar β-form of PVDF. The room temperature dielectric constant as high as 3273 at 100 Hz was obtained for the PVDF comprising 40 vol% KNN nanocrystallites due to dipole-dipole interactions (as the presence of β-PVDF is prominent), whereas it was only 236 for the PVDF containing the same amount (40 vol%) of micron-sized crystallites of KNN at the same frequency. Various theoretical models were employed to predict the dielectric constants of the PVDF-KNN nano and micro crystal composites. The PVDF comprising 70 vol% micron-sized crystallites of KNN exhibited a d 33 value of 35 pC/N, while the nanocrystal composites of PVDF-KNN did not exhibit any piezoelectric response perhaps due to the unrelieved internal stress within each grain, besides the fact that they have less domain walls.

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“…However, when the volume fraction of carbon nanotubes approximates to 1%, d 33 decreases. Luo et al (2014) presented the relationship between volume fractions of calcium barium zirconate titanate (Ba 0.95 Ca 0.05 Zr 0.15 Ti 0.85 O 3 , BCZT) and dielectric constant. They found the dielectric constant increases with the addition of BCZT.…”

Section: Introductionmentioning

confidence: 99%

Energy harvesting from pavement via polyvinylidene fluoride: hybrid piezo-pyroelectric effects

Tao

2016

J. Zhejiang Univ. Sci. A

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Abstract:In the USA, there are over 4 million miles (6 million km) of roadways and more than 250 million registered vehicles. Energy lost in the pavement system due to traffic-induced vibration and deformation is enormous. If effectively harvested, such energy can serve as an alternative sustainable energy source that can be easily integrated into the transportation system. It is well known that most piezoelectric materials are also pyroelectric materials, which convert temperature change into electricity. However, the potential of polyvinylidene fluoride (PVDF) as a hybrid piezo-pyroelectric energy harvester has been seldom studied. The uniqueness of this study lies in that the electrical responses of PVDF under coupled mechanical and thermal stimulations are investigated. Through a series of well controlled experiments, it is found that there exists an interesting coupling phenomenon between piezoelectric and pyroelectric effects of PVDF: the voltage generated by simultaneous mechanical and thermal stimulations is the algebraic sum of voltages generated by separate stimulations. This means that there is neither strengthening nor weakening coupling effect when the piezoelectric and pyroelectric phenomena are coupled. This also makes the modeling process of the hybrid piezoelectric and pyroelectric effect straightforward. An estimation of power generation through piezoelectric and pyroelectric effect is conducted, and the overall effects of temperature on hybrid piezo-pyroelectric energy harvesting are discussed.

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Fabrication, characterization, properties and theoretical analysis of ceramic/PVDF composite flexible films with high dielectric constant and low dielectric loss

Cited by 397 publications

References 38 publications

The fabrication of dielectric elastomers from silicone rubber and barium titanate: employing equi-biaxial pre-stretch to achieve large deformations

The fabrication of dielectric elastomers from silicone rubber and barium titanate: employing equi-biaxial pre-stretch to achieve large deformations

Effect of nano- and micron-sized K0.5Na0.5NbO3 fillers on the dielectric and piezoelectric properties of PVDF composites

Energy harvesting from pavement via polyvinylidene fluoride: hybrid piezo-pyroelectric effects

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