Dielectric response of high permittivity polymer ceramic composite with low loss tangent

Subodh, G.; Deepu, V.; Mohanan, P.; Sebastian, Mailadil Thomas

doi:10.1063/1.3200244

Cited by 120 publications

(63 citation statements)

References 21 publications

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“…The dielectric constant of PS mainly shows an increase with the increasing temperature. Also, the dielectric constant of epoxy has a similar relationship with temperature [15].…”

Section: Resultsmentioning

confidence: 83%

Thermally stable polymer–ceramic composites for microwave antenna applications

Zhang

Yue

et al. 2016

J Adv Ceram

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Polymer-ceramic composites were prepared by twin screw melt extrusion with high-density polyethylene (HDPE) as the matrix and polystyrene-coated BaO-Nd 2 O 3 -TiO 2 (BNT) ceramics as the filling material. Interestingly, the incorporation of polystyrene (PS) by the coating route could significantly improve the thermal behaviors of the composites (HDPE-PS/BNT), besides the temperature stability of dielectric properties and thermal displacement. The microwave dielectric properties of the composites were investigated systematically. The results indicated that, as the volume fraction of BNT ceramic particles increased from 10 to 50 vol% in the composites, the dielectric constant increased from 3.54 (9.23 GHz) to 13.14 (7.20 GHz), which can be beneficial for the miniaturization of microwave devices; the dielectric loss tangent was relatively low (0.0003-0.0012); more importantly, the ratio of PS to HDPE increased accordingly, making the composite containing 50 vol% BNT ceramics have a low value of temperature coefficient of resonant frequency ( f  = −11.2 ppm/℃) from −20 to 60 ℃. The GPS microstrip antennas were therefore designed and prepared from the HDPE-PS/BNT composites. They possessed good thermal stability ( f  = 23.6 ppm/℃) over a temperature range of −20 to 60 ℃, promising to meet the requirements of practical antenna applications.

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“…The dielectric constant of PS mainly shows an increase with the increasing temperature. Also, the dielectric constant of epoxy has a similar relationship with temperature [15].…”

Section: Resultsmentioning

confidence: 83%

Thermally stable polymer–ceramic composites for microwave antenna applications

Zhang

Yue

et al. 2016

J Adv Ceram

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“…It has been known for some time that by adding high permittivity (high k) materials, particularly ceramics, to polymers and epoxy resins that the permittivity of the blend of materials will be higher than that of the original polymer or epoxy alone [13][14][15][16][17][18]. A number of models have been proposed which describe the effective permittivity (ε eff ) of the composite material and a few of which are presented and compared below.…”

Section: Resultsmentioning

confidence: 99%

“…More accurate models are based on "mean field theory" which reduces all interactions on a body to a single average interaction thus removing the uncertainty generally associated with a many body problem. The Maxwell-Garnett equation is one such model [14,18] which can be written as:…”

Section: Resultsmentioning

confidence: 99%

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Route to enhance the efficiency of organic photovoltaic solar cells - by adding ferroelectric nanoparticles to P3HT/PCBM admixture

2014

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We have demonstrated that by adding ferroelectric nanoparticles to poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) photovoltaic devices the relative efficiency can be increased compared to the same blend without these nanoparticles. In this work samples of 20 mg/ml concentrations of P3HT and PCBM were prepared in a 1:1 ratio and the samples prepared using ferroelectric barium titanate (BT) and strontium titanate (ST) nanoparticles in a 1:1:0.5 ratio. The samples were spin coated onto ITO coated glass with a layer of poly(3,4-ethylenedioxythiophene)poly(styrenesulfonate) (PEDOT:PSS). A top electrode of aluminium 1 cm 2 was deposited. The current-voltage characteristics of the devices were determined using a solar simulator and the absorption characteristics by UV-Vis spectroscopy. The samples with BT and ST exhibited increased absorption around 490 nm and increased open circuit voltage and short circuit current compared to the control P3HT/PCBM sample. The possible mechanism that helps to understand the increase in open circuit voltage and short circuit current is also proposed in this work.

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“…FERROELECTRIC ceramic particles are widely used to increase the dielectric constant of polymer composites because of their high dielectric constant and low dielectric loss [1,2]. However, the ability of spherical particles to increase the dielectric constant is small at low volume fractions according to the rule of mixtures [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of high aspect ratio filler on dielectric properties of polymer composites: a study on barium titanate fibers and graphene platelets

Wang

Nelson

Miao

et al. 2012

IEEE Trans. Dielect. Electr. Insul.

106

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High aspect ratio fillers are predicted to increase the dielectric constant of polymer composites more efficiently than spherical fillers according to the rule of mixtures. Using high aspect ratio fillers is a promising route for creating high dielectric constant, low loss materials at a low filler volume fraction, for use as capacitor and electric field grading materials. In this work, two high aspect ratio fillers were mixed into a polymer matrix, and the dielectric properties of composites were studied. Barium titanate fibers were synthesized by electrospinning a sol-gel, followed by a heat treatment to obtain a perovskite crystal structure. The heat treatment conditions were found to be crucial for obtaining tetragonal barium titanate fibers with high dielectric constant. Graphene platelets were prepared by a thermal shock method, which was found to result in a larger dielectric constant. A combination of barium titanate and graphene platelets yielded the highest dielectric constant when used in a polydimethyl siloxane matrix. The increase in dielectric loss over the pure matrix was small when the volume fraction was below the percolation threshold of graphene platelets. Electric flux density-electric field (D-E) measurements showed a linear dielectric constant in barium titanate filled composites and higher loss when graphene was added. The ac breakdown strength was reduced compared to the neat polymer and was affected by filler aspect ratio. The mechanisms that lead to the observed phenomena are discussed.

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Dielectric response of high permittivity polymer ceramic composite with low loss tangent

Cited by 120 publications

References 21 publications

Thermally stable polymer–ceramic composites for microwave antenna applications

Thermally stable polymer–ceramic composites for microwave antenna applications

Route to enhance the efficiency of organic photovoltaic solar cells - by adding ferroelectric nanoparticles to P3HT/PCBM admixture

Effect of high aspect ratio filler on dielectric properties of polymer composites: a study on barium titanate fibers and graphene platelets

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