Electrode polarization vs. Maxwell-Wagner-Sillars interfacial polarization in dielectric spectra of materials: Characteristic frequencies and scaling laws

Samet, Mariem; Levchenko, Volodymyr; Boiteux, Gisèle; Seytre, Gérard; Kallel, A.; Serghei, Anatoli

doi:10.1063/1.4919877

Cited by 254 publications

(135 citation statements)

References 30 publications

Supporting

Mentioning

128

Contrasting

Order By: Relevance

“…The global dielectric response of a bilayer structure consisting of a conductive and an insulating layer can be calculated by considering the complex permittivity functions (or the complex conductivity functions) of the two phases and their corresponding thicknesses

ε_{net}^{*} = \frac{L ε_{cond}^{*} ε_{ins}^{*}}{d_{ins} ε_{cond}^{*} + d_{cond} ε_{ins}^{*}}

where

ε_{cond}^{*} = normalε'_{cond} - i normalε''_{cond}

represents the complex dielectric function of the conductive layer, d cond its thickness,

ε_{ins}^{*} = normalε'_{ins} - i normalε''_{ins}

the complex dielectric function of the insulating layer, d ins its thickness, and L = d ins + d cond represents the total thickness of the polymer sample. Between the complex permittivity function and the complex conductivity function a linear relationship exists, thus,

σ_{cond}^{*} = i normalω ε_{0} ε_{cond}^{*}

, with σ′ cond = ωε 0 ε″ cond and σ″ cond = ωε 0 ε′ cond , and

σ_{ins}^{*} = i normalω ε_{0} ε_{ins}^{*}

, with σ′ ins = ωε 0 ε″ ins and σ″ ins = ωε 0 ε′ ins , ω being the radial frequency of the applied electric field and ε 0 the vacuum permittivity. For the sake of simplicity, the dielectric properties of the samples will be characterized in the subsequent numerical calculations by a pair of two numbers, the dielectric permittivity ε′ and the conductivity σ, with ε′′ = σ/ωε 0 .…”

Section: Resultsmentioning

confidence: 99%

“…This effective approach, nevertheless, presents several important drawbacks, such as for instance a very limited electrochemical window and the necessity of sealing the sample cell due to the presence of the liquid electrolyte phase. As opposed to the electrode polarization that take place at the contact with the external electrodes, interfacial polarization effects offer an alternative route to increase the effective permittivity of materials. Composite materials (and, more general, multiphase materials) represent an optimal choice to this approach, because they fulfill the two essential conditions necessary to give rise to the phenomenon of interfacial polarization: (1) the presence of internal interfaces, and (2) the difference in conductivity between the different phases of the material.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Samet

Kallel

Serghei

2019

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

An efficient approach to obtain polymeric materials with high permittivity values and low dielectric losses is presented in the current study. For this purpose, dielectric measurements by means of broadband dielectric spectroscopy, numerical simulations, and analytical calculations have been carried out for bilayer structures consisting in an insulating and a conductive polymer layer. Polyethyleneterephtalate and polytetrafluoroethylene have been used as insulating layers while, as conductive materials, blends of polyvinyl acetate with an ionic liquid, 1‐butyl‐3‐methylimidazolium tetrafluoroborate. The dielectric properties of the samples have been investigated in a broad frequency (from 10−1 to 107 Hz) and temperature range in order to determine, through the analysis of the scaling laws governing the interfacial polarization effects, the characteristic frequency ranges and the amplitude of the enhanced permittivity. An excellent agreement is found between the experimental results, the numerical simulations, and the analytical calculations. Finally, we show that bilayer polymeric materials with permittivity values as high as ε′ = 556 and with low dielectric losses (tan(δ) = 0.001) can be readily obtained by the current approach. This could have multiple applications, especially in the field of organic electronics. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47551.

show abstract

ε_{net}^{*} = \frac{L ε_{cond}^{*} ε_{ins}^{*}}{d_{ins} ε_{cond}^{*} + d_{cond} ε_{ins}^{*}}

where

ε_{cond}^{*} = normalε'_{cond} - i normalε''_{cond}

represents the complex dielectric function of the conductive layer, d cond its thickness,

ε_{ins}^{*} = normalε'_{ins} - i normalε''_{ins}

σ_{cond}^{*} = i normalω ε_{0} ε_{cond}^{*}

, with σ′ cond = ωε 0 ε″ cond and σ″ cond = ωε 0 ε′ cond , and

σ_{ins}^{*} = i normalω ε_{0} ε_{ins}^{*}

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Samet

Kallel

Serghei

2019

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, an additional process appears at higher temperature and is ascribed to the interfacial polarization known as the Maxwell‐Wagner‐Sillars (MWS) effect. This relaxation arises from the accumulation of charge carriers at the interfaces between the MMT particles and PMATRIF matrix deriving a more conductive material depending on the nature, size and the volume fraction of the filler . In order to prove the found relaxation process and to better resolve the overlapping peaks in dielectric loss, another method based on the approximation of the logarithmic derivative of the real dielectric permittivity by the dielectric loss is used.…”

Section: Resultsmentioning

confidence: 99%

Effect of clay on the dielectric properties of novel fluorinated methacrylate nanocomposites

et al. 2018

View full text Add to dashboard Cite

In this work, the dielectric properties of nanocomposites based on poly(2,2,2‐trifluoroethyl methacrylate) copolymer (PMATRIF) and vinylbenzyl‐functionalized montmorillonite (MMT) nanoparticles prepared via in situ free radical polymerization were studied. The effect of different loadings of (MMT) filler (in weight ratios of 1, 3, and 5%) on the molecular dynamics and polarization of PMATRIF was investigated using broadband dielectric spectroscopy from 10−1 to 106 Hz and at temperatures between 20 and 170°C. For PMATRIF matrix, the real part ε′ and the imaginary part ε″ of the dielectric permittivity curves revealed four dielectric processes β, α, αβ, and ionic conduction phenomenon. Furthermore, it was found that incorporating MMT led to an increase in the dielectric losses and generated additional relaxation processes known as Maxwell–Wagner Sillars polarization. Calculation of the activation energy for the different processes revealed that α relaxation followed the Vogel–Fulcher–Tammann–Hesse dependency while the other processes were suitably fitted with the Arrhenius law. In order to probe matrix/MMT interface properties, dielectric strength of the interfacial polarization Δε is calculated by fitting the dielectric permittivity through the known Havriliak–Negami model. POLYM. COMPOS., 40:3333–3341, 2019. © 2018 Society of Plastics Engineers

show abstract

“…Since breakdown strength E B is the utmost E that can be applied to dielectric capacitors, both ε r and E B have to be enhanced simultaneously to obtain high energy density. [16][17][18][19] The high E B and large U of nanocomposites may be attributed to a small leakage current, low dielectric loss, and low interfacial polarization. [11,12] Hence ceramics nanofillers, such as TiO 2 , [13] BaTiO 3 , [14] and Ba x Sr 1−x TiO 3 , [15] are introduced into the polymer matrix to form polymer nanocomposites in order to compensate for each other's deficiencies.…”

mentioning

confidence: 99%

“…[16][17][18][19] The high E B and large U of nanocomposites may be attributed to a small leakage current, low dielectric loss, and low interfacial polarization. [16][17][18][19] The high E B and large U of nanocomposites may be attributed to a small leakage current, low dielectric loss, and low interfacial polarization.…”

mentioning

confidence: 99%

Nanocomposite Capacitors with Significantly Enhanced Energy Density and Breakdown Strength Utilizing a Small Loading of Monolayer Titania

Wen

Guo

Zhao

et al. 2017

Adv Materials Inter

View full text Add to dashboard Cite

In principle, the energy density (U) of dielectric capacitors is determined by the applied electric field (E) and the electric displacement (D) asAnd the electric displacement (D) is associated with the polarization P and dielectric constant ε r by D = P + ε r ε 0 E. For linear dielectric capacitors, U = 1/2DE = 1/2ε r ε 0 E 2 , where ε 0 is the vacuum permittivity (ε 0 = 8.85 × 10 −12 F m −1 ). Since breakdown strength E B is the utmost E that can be applied to dielectric capacitors, both ε r and E B have to be enhanced simultaneously to obtain high energy density. Ceramics show high dielectric constant but low breakdown strength; while polymers exhibit high breakdown strength but low dielectric constant. [11,12] Hence ceramics nanofillers, such as TiO 2 , [13] BaTiO 3 , [14] and Ba x Sr 1−x TiO 3 , [15] are introduced into the polymer matrix to form polymer nanocomposites in order to compensate for each other's deficiencies. Unfortunately, previous studies have suggested that improved ε r of polymer nanocomposites is obtained merely at the expense of breakdown strength. [13] Thus, it is impracticable to effectively increase both parameters in the polymer nanocomposites.It has been widely demonstrated that interfacial polarization is the primary mechanism of polarization in polymer nanocomposites, caused by the large contrast in the dielectric constant and conductivity at the interface between the polymer matrix and fillers. [16][17][18][19] The high E B and large U of nanocomposites may be attributed to a small leakage current, low dielectric loss, and low interfacial polarization. [20] After years of intensive study, novel strategies have been proposed to resolve the seeming paradox of enhancing ε r while maintaining high E B . One method for modulating the polymer-filler interface is surface functionalization of ceramic fillers with surfactant or oligomers, [21][22][23] which can suppress filler aggregation and retard the movement of charge carriers in the surface between the polymer matrix and fillers. Perry and co-workers reported that phosphonic acid surface modifiers improve the dispersion of BaTiO 3 nanoparticles in nanocomposite films, which lead to high ε r and high E B . [24] Another universal way to alleviate the interfacial polarization between the filler and the polymer matrix is to employ core-shell structured nanofiller. [25][26][27][28] A recent study by Wang and co-workers revealed that 2D hexagonal boron nitride nanosheets and BaTiO 3 nanoparticles, used to improve E B and The dielectric capacitor with high electric energy density is demanded for modern electronic and electrical power systems. However, their energy density is considerably limited by a low dielectric constant and low breakdown strength. Here, thin flexible polymer nanocomposites with high energy density are obtained by only adding a small loading of 2D monolayer titania along with concurrent improvements of dielectric constant and breakdown strength. This work not only first reveals that monolayer titania is an excellent filler...

show abstract

Electrode polarization vs. Maxwell-Wagner-Sillars interfacial polarization in dielectric spectra of materials: Characteristic frequencies and scaling laws

Cited by 254 publications

References 30 publications

Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Polymer bilayers with enhanced dielectric permittivity and low dielectric losses by Maxwell–Wagner–Sillars interfacial polarization: Characteristic frequencies and scaling laws

Effect of clay on the dielectric properties of novel fluorinated methacrylate nanocomposites

Nanocomposite Capacitors with Significantly Enhanced Energy Density and Breakdown Strength Utilizing a Small Loading of Monolayer Titania

Contact Info

Product

Resources

About