Dielectric Permittivity Spectra Research Articles

Impedance spectra of soft ionics

Impedance spectroscopy is widely adopted for probing the charge and charge mobility of soft ion-conducting media, such as synthetic membranes and biological tissue. The spectra exhibit a variety of distinctive signatures, but the physical basis of these is not well understood, e.g. models have not previously accounted for viscoelasticity, hydrodynamics or microstructural heterogeneity. This study explores a physically grounded continuum model that captures how these factors shape conductivity spectra. Nonlinear thermodynamics and linearised dynamics of a viscous electrolyte and compressible, elastic polymer network are coupled under the forcing of an oscillatory electric field. The model is solved in a one-dimensional spatially periodic unit cell, reporting conductivity and dielectric permittivity spectra, including Nyquist representations. Whereas rigid microstructures exhibit ion-diffusion-controlled relaxation, which manifests as a low-frequency dielectric ‘constant’, hydrodynamic and elastic forces contribute to a strongly diverging dielectric permittivity at low frequencies for heterogeneous anionic microstructures. The model also captures distinctive characteristics of experimentally reported impedance spectra for films bearing alternating layers of cationic and anionic charge, again highlighting the role of coupled hydrodynamic, elastic and electrical forces. Sufficiently thin and highly charged bilayers exhibit a notably low high-frequency conductivity. This is explained by strong low-frequency electrostatic polarisation and counter-ion release. The one-dimensional solutions computed herein provide a foundation for much more challenging computations in two and three dimensions.

High frequency dielectric study on the hydrogen bonding interaction on 1,5-pentanediol + 1,4-dioxane binary mixtures

The complex dielectric permittivity spectra (CPS) of a binary mixture of 1,5-pentanediol (1,5-PD) with 1,4-dioxane (1,4-DX) were determined using time-domain reflectometry in the frequency range of 10 MHz to 30 GHz. The experimental CPS data were fitted to the Cole–Davidson equation using a nonlinear least squares fit method to determine the dielectric relaxation parameters. The intermolecular interactions in the binary liquids were studied through the Kirkwood correlation factor, excess parameters, thermodynamic parameters, and Bruggeman’s factor.

Mineral composition, crystallinity and dielectric evaluation of Bamboo Salt, Himalaya Salt, and Ba’kelalan salt content

The mineral composition, crystallinity, and dielectric properties of salts can provide valuable insights into the quality and suitability of different types of salt for various applications. In this study, comprehensive analysis of the X-Ray Diffraction (XRD), X-ray fluorescence (XRF) and dielectric analysis of the Ba'kelalan salt, Himalaya salt and Bamboo salt have been investigated. The mineral composition of these salts, encompassing vital elements such as iodine and other trace minerals, significantly influences the salt's nutritional profile and overall excellence. Nonetheless, gauging the dispersion and density of these minerals poses difficulties due to conventional techniques that can be arduous, damaging, and expensive. Sample preparation is carried out before conducting X-ray diffraction (XRD), X-ray fluorescence (XRF), and dielectric analysis. XRD measurements are performed using the Bruker D2 Phaser to identify crystalline material phases. XRD operates on the principle of constructive X-ray interference within crystalline samples. For elemental analysis across a broad spectrum of materials, XRF is employed. Elemental peaks are scanned, starting from the lowest to the highest angle of incidence. The X-ray intensity at characteristic peaks is compared to the standard series. Dielectric spectroscopy analysis examines the dielectric behaviour of Ba'kelalan salt, Himalaya salt, and Bamboo salt. The setup involves a vector network analyser (VNA) paired with an open-ended coaxial probe, utilizing the microwave method. This approach ensures rapid, efficient, and non-destructive measurements of dielectric constants (ε′) and loss factors (ε”). The dielectric permittivity spectra are acquired within the frequency range of 4 GHz–20 GHz. ε′ of these salts increase with frequency. Meanwhile, ε” seem varies insignificantly over frequency. Mineral contents and crystallinity are the crucial factors lead to these responses. Based on the study, the quality and suitability of the selected salts for specific applications can be determined by considering their mineral composition, crystallinity, and dielectric properties in the context of the intended use. This gives an insight for some applications that may benefit from certain minerals or crystalline structures, others may require specific dielectric properties for effective use. Therefore, understanding these properties allows for decision-making in choosing the right type of salt for a given purpose, whether it's for foods, medical, industrial, healthcare, and technological applications.

Magnetic and Terahertz–Infrared Properties of Nanodispersed Hexaferrite SrxBa(1−x)Fe12O19 Solid Solutions

Hexagonal ferrites with the formula SrxBa(1−x)Fe12O19 (x = 0; 0.3; 0.5; 0.7; and 1) were prepared using the citrate method. The main feature of this synthesis is a relatively low calcination temperature of 700 °C. An X-ray diffraction study revealed a single-phase material. According to SEM, the particles were 50−70 nm in diameter. The Curie temperature of the samples that were determined using the DSC method varied in a very narrow range of 455−459 °C. Analysis of the magnetic hysteresis loops obtained at 300 K and 50 K indicated all samples as magnetically hard materials in a single-domain state. The maximal magnetic characteristics encompass strontium hexaferrite. The terahertz spectra of complex dielectric permittivity and the spectra of infrared reflectivity were measured at room temperature in the range of 6–7000 cm−1. The obtained broad-band spectra of the real and imaginary parts of permittivity reveal significant changes associated with structural distortions of the (Sr,Ba)O12 anti-cuboctahedron caused by the substitution of Ba2+ with Sr2+ in the same crystallographic positions.

Physical and Mathematical Models of Quantum Dielectric Relaxation in Electrical and Optoelectric Elements Based on Hydrogen-Bonded Crystals

The quantum statistical properties of the proton subsystem in hydrogen-bonded crystals (HBC) are investigated. Based on the non-stationary Liouville operator equation (taking into account a number of assumptions established in the experiment), a quantum kinetic equation is constructed for the ensemble of non-interacting protons (an ideal proton gas) moving in the crystal potential image perturbed by the external electric field. The balanced density matrix for the unperturbed proton subsystem is constructed using the quantum canonical Gibbs distribution, and the non-balanced density matrix is calculated from the solutions of the nonlinear quantum kinetic equation by methods in linear approximation of perturbation theory for the blocking electrode model. Full quantum mechanical averaging of the polarization operator makes it possible to study the theoretical frequency-temperature spectra of the complex dielectric permittivity (CDP) calculated using quantum relaxation parameters that differ significantly from their semiclassical counterparts. A scheme is presented for an analytical study of the dielectric loss tangent in the region of quantum nonlinear relaxation in HBC. The results obtained in the given paper are of scientific interest in developing the theoretical foundations of proton conduction processes in energy-independent memory elements (with anomalously high residual polarization) based on thin films of ferroelectric materials in the ultralow temperature range (1–10 K). The theoretical results obtained have a direct application to the study of the tunneling mechanisms of spontaneous polarization in ferroelectric HBC with a rectangular hysteresis loop, in particular in crystals of potassium dideutrophosphate (KDP), widely used in nonlinear optics and laser technology. The quantum properties of proton relaxation in HBC can be applied in the future to the study of solid-state electrolytes with high proton conductivity for hydrogen energy, capacitor technology (superionics, varicodes), and elements of MIS and MSM structures in the development of resonant tunnel diodes for microelectronics and computer technology.

Study of molecular interactions in aqueous polymer in presence of NSAID using spectroscopic technique

The dielectric study of aqueous Polyvinylpyrrolidone (PVP) (K-30) has been carried out in the presence of Ibuprofen (IBP) in the frequency range of 0.01 GHz – 30 GHz at the temperature 298.15 K using time domain reflectometry (TDR). Harviliak-Negami equation is used for the description of complex dielectric permittivity. The complex dielectric permittivity spectra ε*(ν) is described by using Cole-Cole model. The various dielectric properties i.e., dielectric constantεi, dielectric relaxation timeτi, correlation factor g, effective dipole moment μeff were calculated. Two relaxation processes has been observed namely low frequency relaxation (secondary) and high frequency relaxation (primary) for aqueous PVP-IBP mixture.

High entropy BaFe12-x(Ti/Mn/Ga/In)xO19 (x = 1–7) oxides: Correlation of the composition, entropy state, magnetic characteristics, and terahertz properties

The BaFe12-x (Ti/Mn/Ga/In)xO19 (x = 1–7) high-entropy oxides (HEOs) were obtained by solid-phase synthesis. The correlation of the chemical composition (the level of the Fe replacement), structural parameters, magnetic characteristics, and terahertz (THz) properties was investigated. All studied samples were single-phase (SG: P63/mmc). Lattice parameters showed a monotonic increasing trend with an increase of (x). The key role in increasing the lattice parameters of HEOs may belong to the influence of In3+ ions, which are much larger in size than Fe3+ ions. As one of the possible reason for explanation of the lattice parameters behavior we hypothesized that partial charge transformation of the Mn3+ state to the Mn2+ state takes place in order to maintain electrical neutrality. Other cations (Ti/Ga/In) have stable oxidation state. The anisotropic nature of the increase in lattice parameters was demonstrated. No strong correlation between chemical composition and microstructural parameters of the investigated HEOs was observed. The magnetic characteristics of the BaFe12-x (Ti/Mn/Ga/In)xO19 (x = 1–7) HEOs were investigated at broad intervals of magnetic fields and temperatures. The behavior of the magnetic characteristics was shown to be the result of the magnetic structure frustration. In addition, terahertz electrodynamic properties were studied by measuring spectra of complex dielectric permittivity at frequencies 0.2–1.2 THz in the temperature interval 20–300 K. The spectra indicate the presence of a higher-frequency infrared phonon resonance, whose damping decreases with cooling, as well as an excitation below 0.2 THz that freezes out at low temperatures, the origin of which is associated with the polycrystalline nature of the materials.

Optical, rheological, dielectric, and electrical properties of multiple oxides nanosuspended glycerol based semiconductor hybrid nanofluids

Semiconductor hybrid nanofluids (SHNFs) of multiple hybrid nano oxides (TiO2 + ZnO, TiO2 + Al2O3, TiO2 + SiO2, ZnO + Al2O3, and ZnO + SiO2) dispersed at fixed concentration (0.01 wt/wt%) in glycerol (Gly) fluid were prepared through solution mixing and probe ultrasonic cavitation process. These formulated SHNFs (i.e., TiO2 + ZnO/Gly, TiO2 + Al2O3/Gly, TiO2 + SiO2/Gly, ZnO + Al2O3/Gly, and ZnO + SiO2/Gly) were characterized by employing an ultraviolet–visible (UV–vis) spectrophotometer (wavelength range 200 – 800 nm), rheometer (shear rate range 1.32 – 5.28 s−1), and precision inductance–capacitance–resistance (LCR) meter (frequency range 50 Hz – 1 MHz). The dependency of UV–vis absorbance on the equal weight amount combinations of semiconductive and insulating nanosuspended hybrid oxides for these SHNFs was explored and analyzed for energy band gaps which showed strongly ruled by the wide band gap semiconductor TiO2 and ZnO materials. Dielectric permittivity, electrical conductivity, impedance, and electric modulus spectra of these SHNF materials were reported at 298.15 K and confirmed the influence of nanosuspended hybrids on the dielectric polarizations and relaxation behaviour. Dynamic viscosity and shear stress study with the shear rate explained the Newtonian behaviour of these SHNF materials. The multi-functionality of these novel SHNFs for the advances in soft condensed matter device/system technologies including optoelectronic, photovoltaic, UV-blocking, sensing, wavelength filtering, nanodielectric, electrical insulator, and thermal energy and mass transporter were demonstrated.

Structural, optical, mechanical, and dielectric properties studies of carboxymethyl cellulose/polyacrylamide/lithium titanate nanocomposites films as an application in energy storage devices

Carboxymethyl cellulose/polyacrylamide (CMC/PAM) blend was used as a matrix material for fabricating nanocomposite samples reinforced with the cubic lithium titanate nanoparticles (Li4Ti5O12 NPs, particle size <55 nm) by the solution casting method. The structural, optical, thermal, mechanical, and dielectric properties of the nanocomposite were investigated. The CMC/PAM structure's increased amorphous areas and the existence of hydrogen and coordination bonds in the nanocomposite samples were both revealed by the XRD and FT-IR spectra. The optical measurements indicated the absorbance significantly improved and the energy band gap decreased as indicated in the UV–Visible spectra. Due to interactions between the polymer and nanoparticles and the fine dispersion of NPs, the inclusion of Li4Ti5O12 NPs improved the thermal stability at high temperatures of CMC/PAM, according to the results of TGA thermograms. The mechanical properties of the CMC/PAM were improved by addition of the nanofiller. The dielectric parameters, such as the dielectric permittivity and modulus spectra, of nanocomposite films were also reported, where these parameters can be advantageously tuned with Li4Ti5O12 content in the CMC/PAM blend that depicts them as attractive biodegradable polymer nano-dielectrics. The relaxation process and predominant effect of interfacial polarization within these hybrid samples are reported. The obtained results depict multifunctionality of these nanocomposite films as optical band gap tuner, development of solid polymer electrolyte, dielectric permittivity controllable nanodielectrics for preparation of high-density energy storing/advanced microelectronic devices.

Complex Dielectric Permittivity Spectra of Rapeseed in the 20 MHz-3 GHz Frequency Range.

Rapeseed is one of the most important sources of vegetable oil worldwide. Knowledge of the dielectric properties of rapeseed may be beneficial for moisture content determination and the optimization of microwave treatment processes. The aim of this research was to examine the complex dielectric permittivity spectra of rapeseed of moisture content from 8.3% to 16.1%. The measurements were performed in the 20 MHz–3 GHz frequency range with the use of a vector network analyzer and a coaxial transmission-line cell. The real part of dielectric permittivity significantly depended on the water content of the seeds. The obtained spectra were modeled with the use of a three-pole Debye model with bulk electrical conductivity. Because the highest-frequency pole was found near the high-frequency measurement band limit, the spectra were additionally modeled with the use of an approximate ABC model with two in-band Debye poles. The determined model parameters were found to be highly dependent on the water content of the seeds. The relations between these parameters and water content were analyzed.

Robustness for the Starting Point of Two Iterative Methods for Fitting Debye or Cole–Cole Models to a Dielectric Permittivity Spectrum

Curve-fitting means the determination of the set of parameters that best fit the input data set as expressed by a given function that is usually non-linear. The paper addresses the curve fitting of Debye and Cole–Cole models to a dielectric permittivity spectrum. The success of a nonlinear curve fit heavily depends on the choice of the algorithm and how close the starting point is to the solution. For these reasons, two different algorithms, the Levenberg–Marquardt and the Variable Projection algorithms, were used for constrained optimization and compared, with particular reference to robustness with respect to the choice of the starting point of the reconstruction procedure. The dielectric spectrum of blood plasma with different glucose concentrations is taken as reference data and a Monte Carlo analysis was conducted to evaluate accuracy and precision in the two methods provided as the distance of the initial parameters from the true value’s changes. In general, both algorithms with constraints on the parameters provide good results for practical situations, although the Variable Projection Algorithm has a greater computational burden for large data sets.

Influence of phase formation conditions on the dielectric properties of Bi0.5La0.5MnO3 ceramics modified with magnetoactive elements

Modified solid solutions based on the multiferroic Bi0.5La0.5MnO3 were synthesized by conventional ceramic technology. The modifiers were introduced stoichiometrically in the form of Fe2O3, Co2O3 by the formula Bi0.5La0.5Mn1-xZxO3. The processes of phase formation, structural characteristics, dielectric properties, and microstructure were studied. Anomalies in the dielectric permittivity spectra were found, probably associated with the Maxwell-Wagner polarization. Correlations were established between the macro-properties of the samples and the phase transition phenomena characteristic of them.

Impact of A-site calcium on structural and electrical properties of samarium cobaltite perovskites

Perovskite structured samarium cobaltite ceramics materials having good electric, dielectric and modulus characteristics are used as potential candidate in several device applications. The present study discusses the structural and dielectric properties of Sm1-xCaxCoO3 (x = 0.0,0.05,0.1,0.2,0.3) (SCC) synthesised by high temperature solid state reaction method. The x-ray diffraction analysis confirmed the orthorhombic phase for the synthesised samples at room temperature. Scanning electron microscopy of the sample strongly supports the formation of regular distribution of grains with desirable density. The impedance, dielectric permittivity and modulus spectrum of SCC were studied in a wide frequency (100 Hz-1MHz) range at various temperature. From the complex modulus analysis, the conductivity relaxation in SCC have been studied. The dependence of dielectric properties of these material on frequency indicates its ferroelectric nature. AC conductivity formalism has also been studied.

Scaling effects in the alternating-current poling of thin PIN-PMN-PT single crystals

AC-poling of Pb(In1/2Nb1/2)O3-Pb(Mg1/3Nb2/3)O3-PbTiO3 (PIN-PMN-PT) single crystals with a thickness of 0.06–0.16 mm was studied in this paper. Compared with DC-poled samples, enhancements in piezoelectric and dielectric properties can be obtained when the thickness is above 0.1 mm. However, inconsistency in poling effects was found in the crystals with thickness below 0.1 mm. To elucidate why such scaling effect arises, surface roughness was measured by an atomic force microscopy to correlate surface morphology and poling effects. It was found that non-uniform surface roughness led to inconsistent and decreased properties. Furthermore, temperature-dependent dielectric permittivity spectra were measured to explore how crystal thickness affects the thermal stability of ferroelectric phases. It is noted that complex changes in crystallographic symmetries emanate by decreasing thickness. Such phenomena can be attributed to more influential effects of surface morphology when thickness is reduced. We hope this work suggests a clue for solving the scaling effects of AC-poling on relaxor-PbTiO3 single crystals.

Understanding the molecular interaction and relaxation findings in amphiphilics on solution state using TDR

The dielectric behavior of stearic acid in 1,4-dioxane medium at various temperature 303 K–288 K and frequency regime (10 MHz–30 GHz) determined from the complex dielectric permittivity spectra obtained by Time Domain Reflectometry(TDR). In this frequency range, the dielectric study gives the electrostatic interaction as well as orientational polarizability of complex mixtures of long chain molecules significantly. Dielectric parameters were calculated from the complex spectra of the binary mixture by non linear least square fit method. The excess permittivity (εE), correlation factors were calculated for the binary system. Thermal parameters(ΔH-enthalpy, ΔS-entropy and ΔG-Gibbs free energy) were calculated and the direction of reaction is determined. The FTIR spectrum of the binary system recorded and the assignments are discussed. The FTIR spectral assignments confirm the molecular interactions.

Radar absorbing and shielding characteristics in ferrite-polymer composites Mn-Zn ferrite/P (TFE-VDF)

The article discusses the electromagnetic absorbing and shielding properties of ferrite-polymer composites of the composition Mn-Zn ferrite/fluoroplast-42, obtained by pressing a mixture of powders with heating. The measurement of the complex magnetic and dielectric permittivity spectra, as well as the reflection coefficient spectra was carried out in the frequency range 0.1-7 GHz. Using the obtained spectra, a comprehensive analysis of the absorbing characteristics of the composites was carried out, and the factors responsible for the absorption were determined. Fitting of the composites magnetic permeability spectra show that the process of natural ferromagnetic resonance prevails over the resonance of domain walls, and a decrease in the concentration of ferrite inclusions leads to a significant shift in the frequency of natural ferromagnetic resonance to high frequencies. It was found that for composites with a thickness of 5-10 mm, compositions with a mass fraction of ferrite ≤0.4 show radio-absorbing properties, while compositions with a fraction of ≥0.6 show shielding properties. Keywords: polymer composite, magnetic properties, radio absorption, feromagnetic resonance, polyvinylidene fluoride, manganese-zinc ferrite.

Радиопоглощающие и радиоэкранирующие характеристики феррит-полимерных композитов Mn-Zn феррит/П (ТФЭ-ВДФ)

The article discusses the electromagnetic absorbing and shielding properties of ferrite-polymer composites of the composition Mn-Zn ferrite/fluoroplast-42, obtained by pressing a mixture of powders with heating. The measurement of the complex magnetic and dielectric permittivity spectra, as well as the reflection coefficient spectra was carried out in the frequency range 0.1 - 7 GHz. Using the obtained spectra, a comprehensive analysis of the absorbing characteristics of the composites was carried out, and the factors responsible for the absorption were determined. Fitting of the composites magnetic permeability spectra show that the process of natural ferromagnetic resonance prevails over the resonance of domain walls, and a decrease in the concentration of ferrite inclusions leads to a significant shift in the frequency of natural ferromagnetic resonance to high frequencies. It was found that for composites with a thickness of 5 - 10 mm, compositions with a mass fraction of ferrite ≤ 0.4 show radio-absorbing properties, while compositions with a fraction of ≥ 0.6 show shielding properties.

Two-Step Aging of Highly Polar Glass.

Nonequilibrium processes, including physical aging, belong to the most challenging phenomena of glassy dynamics. One of the fundamental problems that needs clarification is the effect of material polarity on the time scale of the structural recovery of glass. The importance of this issue arises from practical applications and recent findings suggesting a substantial contribution of dipole–dipole interactions to the dielectric permittivity spectra of polar glass-formers. Herein, we use dielectric spectroscopy to investigate structural relaxation and aging dynamics of highly polar glass-former 4-[(4,4,5,5,5-pentafluoropentoxy)methyl]-1,3-dioxolan-2-one (FPC), a derivative of propylene carbonate with εs = 180 and μ = 5.1. We show that ε″(tage) data of FPC at Tage < Tg reveal complex behavior resulting from considerable cross-correlation effects. Namely, two characteristic aging time scales, reflecting the evolution of cross-correlation mode and generic structural relaxation toward equilibrium, are obtained at a given Tage. Furthermore, a single stretched exponential behavior of ε″(tage) has been received for weakly polar carvedilol with negligible dipole–dipole interactions.

Terahertz-infrared dielectric properties of lead-aluminum double-cation substituted single-crystalline barium hexaferrite

Hexaferrite materials are highly demanded to develop and manufacture electronic devices operating at radio- and microwave frequencies. In the light of the prospects for their use in the forthcoming terahertz electronics, here, we present our results on the terahertz and infrared dielectric response of a typical representative of hexaferrites family, lead-substituted M-type barium hexaferrite doped with aluminum, Ba0.2Pb0.8AlxFe12-xO19, x(Al) = 0.0, 3.0, and 3.3. We studied uniquely large and high-quality single crystals of the compounds prepared by spontaneous crystallization growth technique. Our aim was to explore the effect of aluminum substitution on the dielectric response of the compounds. Systematic and detailed investigations of the dependences of terahertz-infrared (frequencies 8–8000 cm−1) spectra of complex dielectric permittivity on the temperature, 4–300 K, and on the chemical composition, x(Al) = 0.0, 1.2, 3.0, and 3.3, were performed for two principal polarizations of the electric field E-vector of the probing radiation relative to the crystallographic c-axis, namely E||c and E⊥c. Furthermore, infrared phonon resonances are recorded and discussed. In contrast to undoped BaFe12O19, no softening of the lowest frequency A2u phonon is observed, indicating suppression of a displacive phase transition in substituted compounds. A number of resonance absorption bands are discovered at terahertz frequencies and assigned to transitions between energy levels of the fine-structured ground state of Fe2+ (5E) ions. The temperature and aluminum-doping dependences of the resonances are analyzed with an account taken of disorder introduced by aluminum. Basing on dielectric data and detailed X-ray experiments, we find that for all concentrations of Al3+ ions, x(Al) = 0.0, 1.2, 3.0, and 3.3, they mainly occupy the 2a and 12k octahedral site positions and that the degree of substitution of iron in tetrahedral positions is not substantial. Along with fundamental findings, the obtained data on broad-band dielectric properties of Ba0.2Pb0.8AlxFe12-xO19 crystals provides the information that can be used for development and manufacture of electronic devices with operating frequencies lying in the terahertz spectral band.

Assessment of proton conductivity, dielectric relaxation and other physicochemical properties of LTA zeolite blended chitosan composites for membrane applications

Novel chitosan biopolymer based solid electrolyte system consisting of surfactant-modified zeolite A are fabricated via simple solvent-casting technique to yield thin film proton exchange membrane. The zeolite LTA (Linde type-A) is synthesized and then it is impregnated with a surfactant, sodium dodecyl sulfate. The interfacial compatibility as well as the strong interaction in the polymer-filler system, modification of zeolite-A as well as its elemental composition is confirmed using FTIR, XRD and SEM-EDAX analysis. The physicochemical characteristics of the prepared membranes such as water uptake, IEC, hydration number and dimensional stability found to increase with increasing concentrations of the doped zeolitic filler. The appreciable mechanical as well as oxidative stability displayed by the membranes is due to the strong H-bond interaction between the polymer and modified zeolite. Overall, CSA-1.0 composite membrane showed the highest proton conductivity of 4.45 mS cm−1 at 80 °C, good thermal stability with Tmax = 217 °C and lesser gas permeability around 5 barrer. By determining the bound water content of the membranes using TGA analysis, the self-humidification characteristics were investigated. Good compatibility and interfacial interaction in the composite membranes has resulted in the creation of non-tortuous pathways for efficient proton transfer predominantly through Grotthus type mechanism. The relevant mechanism for the proton transfer along the membranes is evaluated in terms of complex impedance analysis, dielectric permittivity and electric modulus spectra. On the whole, the results obtained from various analysis suggests that the fabricated composite membranes are good alternatives as proton exchange membranes for fuel cell applications.