Study on epoxy/BaTiO3 composite embedded capacitor films (ECFs) for organic substrate applications

Cho, Sung-Dong; Lee, Joo-Yeon; Hyun, Jin-Gul; Paik, Kyung‐Wook

doi:10.1016/j.mseb.2004.01.022

Cited by 150 publications

(74 citation statements)

References 8 publications

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“…The dielectric constant increased from 3 to 6.5 for the composites filled with 20 vol% of the lowest aspect ratio fibers (AR=3). The relative dielectric constant increase over the neat polymer is comparable to that of composites filled with spherical or irregular BaTiO 3 particles reported in the literature [4][5][6]. Meanwhile, the high aspect ratio fiber (AR=15) leads to a significant increase in the composite relative dielectric constant to 12.…”

Section: Dielectric Sepctroscopy Of Compositessupporting

confidence: 71%

“…However, the ability of spherical particles to increase the dielectric constant is small at low volume fractions according to the rule of mixtures [3]. Higher volume fractions lead to increased dielectric constant, but also to a reduction in electrical breakdown strength and mechanical properties [4][5][6][7]. Composites with high aspect ratio (AR) fillers are predicted to exhibit higher dielectric constant at lower loading [3], thereby potentially maintaining the mechanical properties and dielectric breakdown strength [5].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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.

109

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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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Section: Dielectric Sepctroscopy Of Compositessupporting

confidence: 71%

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.

109

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“…10 Below this size, dielectric constant sharply decreases, in conjunction with the reduction of tetragonality and remnant polarization. 10 The crystal structure of BT powder changes with particle size. Below ϳ100 nm, tetragonality disappears, resulting in a cubic structure.…”

Section: Introductionmentioning

confidence: 99%

“…For example, thin film capacitor materials formed by vacuum deposition have the advantage of fairly high capacitance, while they have the drawbacks of high processing temperature and cost. 10 In bulk BT ceramics, grain size has a strong effect on the dielectric constant at room temperature for the grain size below ϳ10 m.…”

Section: Introductionmentioning

confidence: 99%

Effect of dehydroxylation of hydrothermal barium titanate on dielectric properties in polystyrene composite

Badheka

Magadala

Devaraju

et al. 2005

J of Applied Polymer Sci

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In today's world, technology for capacitors has grown significantly with its requirements in the direction of better dielectric properties. Developing an ideal composite material (polymer and ceramic) for satisfying the processing parameters is of great interest for capacitor industry. In this study, chemically treated barium titanate (BT) nanocrystals were prepared and used to make ceramicpolystyrene (PS) composites. A unique methodology was used in processing these materials. Effects of the chemically treated BT, filler loading, and frequency on the dielectric properties of these composites were examined, and compared with untreated BT-PS composites. Composite dielectric constant was proportional to the volume ratio of the BT filler and remained stable at different frequencies. The experimental data show that the dielectric constant of composites made with treated BT powders can attain values 2.5 times higher than that of untreated BT-PS composites. In addition, the composite shows consistency in dielectric constant values measured at different frequencies.

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“…Spraying is a convenient and economical manufacturing method for 70 producing high quality polymer-ceramic composite films for various applications such as capacitors. The spraying system comprises a pneumatic nozzle, syringe pump and compressed air supply with minimum equipment maintenance required and is suitable for efficient small quantity spraying when compared with spin-coating which causes significant waste of precursor materials [23]. This 75 spray deposition technique has been shown in previous work [24,25] to be highly effective in producing small area films for energy storage demonstrators.…”

Section: Methodsmentioning

confidence: 99%

Preparation, microstructure and microwave dielectric properties of sprayed PFA/barium titanate composite films

Qin

Dancer

Grovenor

et al. 2016

Composites Science and Technology

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Frequency dependence of the dielectric properties of polymer-ferroelectric composites at different bands of microwave frequencies was investigated in this work.Perfluoroalkoxy (PFA) / barium titanate (BaTiO 3 ) nanocomposite films were prepared by spray deposition. The spraying process was scaled up to fabricate large area (max. 160 mm x 160 mm) uniform composite sheets out of which a controlled bonding process was introduced to form composite blocks.The microstructure of the composite films was examined by SEM with a microtome sample preparation method to evaluate the effectiveness of the spraying process at producing uniform particle distributions. The dielectric properties of the composite films with various BaTiO 3 loadings were characterised by an Impedance Analyzer at frequencies between 10 Hz and 1 MHz and Vector Network Analyzer at 12 -18 GHz respectively. The Lichtenecker mixing rule was incorporated to fit the measured dielectric constant data, which gives estimates of dielectric constant of the BaTiO 3 nanometer sized particles to be 895 and 571 at 10 kHz and 15 GHz respectively. In comparison, the composite effective dielectric constant was approximately reduced by 25% at 10 kHz than that at 15 GHz.

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Study on epoxy/BaTiO3 composite embedded capacitor films (ECFs) for organic substrate applications

Cited by 150 publications

References 8 publications

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

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

Effect of dehydroxylation of hydrothermal barium titanate on dielectric properties in polystyrene composite

Preparation, microstructure and microwave dielectric properties of sprayed PFA/barium titanate composite films

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