Enhanced dielectric properties of PVDF-HFP/BaTiO<sub>3</sub>-nanowire composites induced by interfacial polarization and wire-shape

Feng, Yu; Li, Wei Li; Hou, Yafei; Yu, Yang; Cao, Wenwu; Zhang, T. D.; Fei, W. D.

doi:10.1039/c4tc02183e

Cited by 298 publications

(152 citation statements)

References 57 publications

(52 reference statements)

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“…Toward this end, two strategies have been developed to improve the dielectric constants of polymer composites: (1) ceramic-polymer composites composed of high-k ceramic fillers (e.g., BaTiO 3 [23][24][25][26][27], TiO 2 [28,29], SrTiO 3 [30]) dispersed in polymer matrix and (2) conductor-polymer composites consisting of conductors (e.g., metals, [31,32], graphite [33,34], carbon nanotube [35][36][37], graphene [38,39], carbon black [40], and conductive polymer [41,42]) dispersed in polymer matrix. For ceramic-polymer composites, the enhancement of permittivity is limited (below 50 @10 kHz) even when the ceramic loading excesses 50 vol%, leading to deteriorated mechanical properties, high loss, and low breakdown strength [43]. For conductor/polymer composites, although ultrahigh permittivity could be achieved, high loss is also inevitable due to the electron tunneling and leakage ohmic conduction near percolation [44,45].…”

Section: Introductionmentioning

confidence: 99%

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Mao

Shi

Wang

et al. 2018

Adv Compos Hybrid Mater

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The search for high-performance dielectric materials has long been driven by the urgent needs for various modern electronics. However, enhanced permittivity is always accompanied by elevated loss, which seriously hinders the development and applications of dielectric materials. Herein, negative-k layers were introduced into layer-structured films, forming a new class of multilayer composites consisting of alternately stacked positive-k and negative-k layers. Compared with traditional multilayer composites without negative-k layers, the layered composites containing extra positive-k/negative-k interfaces exhibit superior ability in balancing the contradict parameters: permittivity and loss, yielding substantially enhanced permittivity without sacrificing the low loss. It is indicated that the permittivity was enhanced by the charge accumulations and reinforced polarizations on the interfaces between positive-k and negative-k layers. Meanwhile, the loss induced by the leakage current was suppressed by the blocked transport of carriers between adjacent layers. The trilayered 60-3.5-60 composite exhibits an enhanced dielectric constant (ε′ ≈ 33 @10 kHz) and retained low loss (tanδ ≈ 0.12 @10 kHz) compared with the single-layer BT/PVA composite containing 60 wt% BT fillers (ε′ ≈ 9.5 @10 kHz, tanδ ≈ 0.075 @10 kHz). This research offers an effective way to design and fabricate novel high-performance dielectric materials.

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Section: Introductionmentioning

confidence: 99%

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Mao

Shi

Wang

et al. 2018

Adv Compos Hybrid Mater

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“…To lower the percolation threshold of the composite, llers with high aspect ratio, such as metal nanowires, carbon nanotubes and carbon nanobers, are usually chosen. [22][23][24][25][26] However, how to realize the homogeneous distribution of these nano-scale llers in the matrix turns to be a great challenge. Up to now, many methods have been proposed, among which the surface modication process has been proved to be an effective way to prepare homogeneous percolative high-k composites with improved dielectric strength and dielectric loss.…”

Section: Introductionmentioning

confidence: 99%

Ni/Al₂O₃/epoxy high-k composites with ultralow nickel content towards high-performance dielectric applications

et al. 2016

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Nickel/alumina/epoxy three-phase composites consisting of nickel particles dispersed in alumina/epoxy composite matrix were prepared using a facile wet impregnation process. The influences of in situ formed alumina particles (i-Al 2 O 3 ) and epoxy on the dielectric properties of the composites were investigated in detail. For the composites with nickel contents far below the percolation threshold, the main electrical conduction mechanism is hopping conduction, and the main loss comes from polarizations. Therefore, the formation of alumina and epoxy result in higher permittivity but high loss due to the enhanced interfacial polarization. For the composites with nickel contents below but near the percolation threshold, the main electrical conduction mechanism is metal-like conduction and the main loss comes from eddy currents under high frequency electric field. Accordingly, the i-Al 2 O 3 and filled epoxy between nickel particles could bring both high permittivity and low loss. This paper experimentally shows how the characteristics of the interface between different phases influence the dielectric performances of composites. And the impregnation process is an effective strategy to obtain percolative metal/ceramic/polymer three-phase composites with ultralow metal content, high permittivity and low loss.

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“…polarization between the PVDF matrix and CCTO@Ni filler, which is the same as the related literature. 16, 35 These results demonstrate that magnetic treatment may significantly enhance the dielectric permittivity of PVDF composites. Figure 7 shows how the magnetic field treatment affected the conductivity of PVDF#1-3 at room temperature.…”

Section: B Dielectric Properties Of Pvdf and The Untreated Pvdf Compmentioning

confidence: 63%

Effects of magnetic field treatment on dielectric properties of CCTO@Ni/PVDF composite with low concentration of ceramic fillers

et al. 2015

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Using melt mixing, we produced a ceramic/polymer composite with a matrix of polyvinylidene fluoride (PVDF) and a filler of 5 vol.% Ni-deposited CaCu3Ti4O12 core-shell ceramic particles (CCTO@Ni), and studied its prominent dielectric characteristics for the first. Its phase composition and morphology were analyzed by X-ray diffraction and scanning electron microscopy, respectively. After treating the composite films with various durations of a magnetic field treatment, we compared their dielectric properties. We found that the CCTO@Ni ceramic had a typical urchin-like core-shell structure, and that different durations of the magnetic field treatment produced different distributions of ceramic particles in the PVDF matrix. The dielectric permittivity of the untreated CCTO@Ni/PVDF composite was 20% higher than that of neat PVDF, and it had a low loss tangent. However, only the composite treated for 30 min in the magnetic field had an ultra-high dielectric permittivity of 1.41 × 104 at 10 Hz, three orders of magnitude higher than the untreated composite, which declined dramatically with increasing frequency, accompanied by an insulating-conducting phase transition and an increase in loss tangent. Our results demonstrate that changes in the dielectric properties of PVDF composites with magnetic field treatment are closely related to the percolation effect and interfacial polarization.

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Enhanced dielectric properties of PVDF-HFP/BaTiO₃-nanowire composites induced by interfacial polarization and wire-shape

Abstract: A high-ε polymer based composite with lower inorganic content (≤10 vol%) has been fabricated using BaTiO3 nanowires as fillers.

Cited by 298 publications

References 57 publications

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Ni/Al₂O₃/epoxy high-k composites with ultralow nickel content towards high-performance dielectric applications

Effects of magnetic field treatment on dielectric properties of CCTO@Ni/PVDF composite with low concentration of ceramic fillers

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Enhanced dielectric properties of PVDF-HFP/BaTiO3-nanowire composites induced by interfacial polarization and wire-shape

Abstract: A high-ε polymer based composite with lower inorganic content (≤10 vol%) has been fabricated using BaTiO3 nanowires as fillers.

Cited by 298 publications

References 57 publications

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Improved dielectric permittivity and retained low loss in layer-structured films via controlling interfaces

Ni/Al2O3/epoxy high-k composites with ultralow nickel content towards high-performance dielectric applications

Effects of magnetic field treatment on dielectric properties of CCTO@Ni/PVDF composite with low concentration of ceramic fillers

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Enhanced dielectric properties of PVDF-HFP/BaTiO₃-nanowire composites induced by interfacial polarization and wire-shape

Ni/Al₂O₃/epoxy high-k composites with ultralow nickel content towards high-performance dielectric applications