Dielectric relaxation and electric modulus of polyvinyl alcohol–Zinc oxide composite films

More, Shital; Dhokne, Ragini; Moharil, S. V.

doi:10.1088/2053-1591/aa6b26

Cited by 36 publications

(16 citation statements)

References 42 publications

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“…At high temperatures and frequencies, the AC conductivity becomes less frequency dependence which follows the data reported in [47]. Moreover, the AC conductivity increases as the temperature increases at low frequencies but may be unchanged at high frequencies due to thermal energy activation of charge carriers and ions [48]. Depending on the Jonscher universal power law the effect of frequency on conductivity of polymer nanocomposites for temperature ranging from 323 to 403 K is given by [49]:…”

Section: Resultssupporting

confidence: 67%

Dielectric spectroscopy of PVA-Ni_0.5Zn_0.5Fe₂O₄polymer nanocomposite films

Taha

Hassona

El‐Rabaie

et al. 2020

Journal of Asian Ceramic Societies

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This paper seeks to address the AC electrical properties of polyvinyl alcohol (PVA)-Ni 0.5 Zn 0.5 Fe 2 O 4 nanocomposites with different weight ratios (PVA/Ni 0.5 Zn 0.5 Fe 2 O 4 = 100/0, 95/5, 85/15, and 50/50) in the temperature ranging from 323 to 403 K at the frequencies from 0.01 Hz to 20 MHz. The real part of the complex permittivity (ԑʹ) was enhanced with both the temperature and concentration of Ni 0.5 Zn 0.5 Fe 2 O 4 nanocrystals, which originates from nano-capacitor structures experiencing interfacial polarization. These nanocomposites were shown to enhance the imaginary part (ԑ″) with the temperature, which was attributed to mobile charge carriers along conductive fillers. The static (ԑ s) and infinity (ԑ ∞) permittivity were obtained from Cole-Cole plots and showed an increase with temperature. The relaxation time (τ o) and molecular relaxation time (τ m) showed temperature dependence and decrease with increasing the temperature. The Gibbs free energy (G), enthalpy (ΔH), and the entropy (ΔS) of the activation are estimated. The ac conductivity showed frequency and temperature dependence and the charge carrier transport follow correlated barrier hopping model (CBH). The Austin-Mott model was applied to the nanocomposites and showed that the density of states at the Fermi level increased with increasing the temperature.

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Section: Resultssupporting

confidence: 67%

Dielectric spectroscopy of PVA-Ni_0.5Zn_0.5Fe₂O₄polymer nanocomposite films

Taha

Hassona

El‐Rabaie

et al. 2020

Journal of Asian Ceramic Societies

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“…The ZnO–CuO and ZnO–PbO doped PVA nanocomposite films were studied for microbial sensor application . The ac conductivity and dielectric relaxation behavior of PVA–ZnO nanocomposites were investigated by More and his research team . The PVA–Ag nanocomposite was prepared by the simple chemical route to explore the effect of Ag on the conducting properties of PVA .…”

Section: Introductionmentioning

confidence: 99%

Optical, thermal, mechanical properties, and non‐isothermal degradation kinetic studies on PVA/CuO nanocomposites

Selvi

Mahalakshmi²,

Parthasarathy

et al. 2019

Polymer Composites

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The CuO nanoparticle doped poly(vinyl alcohol) (PVA) nanocomposite films were prepared by the solution casting method. The structure of the prepared CuO nanoparticles and PVA nanocomposite films were confirmed by FTIR spectroscopy and XRD. The (101) crystal plane of PVA was observed at 19.8 in XRD. The size of the CuO nanoparticles was determined as 20 nm using Scherrer's formula. It was further confirmed with HRTEM. The surface morphology of the nanocomposite films was investigated using SEM. The optical properties of the prepared CuO nanoparticles and PVA nanocomposite films were analyzed by UV-Visible spectroscopy. The band gap of PVA was decreased after the incorporation of CuO in PVA. The thermal stability of the pure PVA and its nanocomposites was examined using TGA to assess their thermal degradation temperature at five different heating rates. The thermal stability of PVA nanocomposites was increased as compared with pure PVA. The non-isothermal degradation kinetic studies were also carried out to determine the energy of activation (E a ) for the degradation process using four different kinetic models. The tensile strength and Young's modulus of PVA nanocomposite films were notably increased with the increasing concentration of CuO nanoparticles. POLYM. COMPOS., 40:3737-3748, 2019. POLYMER COMPOSITES-2019 FIG. 4. HRTEM image of (a) CuO nanoparticles, (b) SAED pattern of CuO, and (c) HRTEM image of 6 wt% CuO loaded PVA nanocomposites system. [Color figure can be viewed at wileyonlinelibrary.com]

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“…is shift in peak positions towards the higher frequency whenever the temperature is raised can likely be attributed to the lowering of the bulk resistivity of the whole sample. e viscosity of the polymer started to decrease slightly due to an increase in temperature, particularly beyond 288 K, resulting in an ease of rotation of dipole with the field and a slight increase in dielectric constant [47]. e asymmetric peak behaviour suggests the presence of electrical processes in the material with the spread out of relaxation time [48].…”

Section: Dielectric and Electric Modulus Studymentioning

confidence: 99%

“…e peak shifting towards the higher frequency region with an increase in temperature occurs as a consequence of relaxation time decreasing. is can be due to the thermally activated charge carrier at the high temperatures [47]. At first glance, the right and left sides of the M i frequency peaks represent the charge carriers that are spatially confined to the potential wells and those that are mobile over a long distance, respectively.…”

Section: Dielectric and Electric Modulus Studymentioning

confidence: 99%

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

Aziz

Hamsan

Kadir

et al. 2020

Advances in Polymer Technology

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There is a considerable demand for the development and application of polymer materials in the flexible electronic- and polymer-based electrolyte technologies. Chitosan (CS) and poly(2-ethyl-2-oxazoline) (POZ) materials were blended with different ratios to obtain CS:POZ blend films using a straightforward solution cast technique. The work was involved a range of characteristic techniques, such as impedance spectroscopy, X-ray diffraction (XRD), and optical microscopy. From the XRD spectra, an enhancement in the amorphous nature in CS:POZ blend films was revealed when compared to the pure state of CS. The enhancement was verified from the peak broadening in CS:POZ blend films in relative to the one in crystalline peaks of the CS polymer. The optical micrograph study was used to designate the amorphous and crystalline regions by assigning dark and brilliant phases, respectively. Upon increasing POZ concentration, the dielectric constant was found to increase up to ɛ′ = 6.48 (at 1 MHz) at 15 wt.% of POZ, and then a drop was observed beyond this amount. The relatively high dielectric constant and dielectric loss were found at elevated temperatures. The increase of POZ concentration up to 45 wt.% made the loss tangent to shift to the lower frequency side, which is related to increasing resistivity. The increases of dielectric constant and dielectric loss with temperature were attributed to the increase of polarisation. The loss tangent peaks were found to shift to the higher frequency side as temperature elevated. Obvious relaxation peaks were observed in the imaginary part of electric modulus, and no peaks were found in the dielectric loss spectra. The concentration dependent of M″ peaks was found to follow the same trend of loss tangent peaks versus POZ content. The relaxation process was studied in terms of electric modulus parameters.

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Dielectric relaxation and electric modulus of polyvinyl alcohol–Zinc oxide composite films

Cited by 36 publications

References 42 publications

Dielectric spectroscopy of PVA-Ni_0.5Zn_0.5Fe₂O₄polymer nanocomposite films

Dielectric spectroscopy of PVA-Ni_0.5Zn_0.5Fe₂O₄polymer nanocomposite films

Optical, thermal, mechanical properties, and non‐isothermal degradation kinetic studies on PVA/CuO nanocomposites

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

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Dielectric relaxation and electric modulus of polyvinyl alcohol–Zinc oxide composite films

Cited by 36 publications

References 42 publications

Dielectric spectroscopy of PVA-Ni0.5Zn0.5Fe2O4polymer nanocomposite films

Dielectric spectroscopy of PVA-Ni0.5Zn0.5Fe2O4polymer nanocomposite films

Optical, thermal, mechanical properties, and non‐isothermal degradation kinetic studies on PVA/CuO nanocomposites

Design of Polymer Blends Based on Chitosan:POZ with Improved Dielectric Constant for Application in Polymer Electrolytes and Flexible Electronics

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Dielectric spectroscopy of PVA-Ni_0.5Zn_0.5Fe₂O₄polymer nanocomposite films

Dielectric spectroscopy of PVA-Ni_0.5Zn_0.5Fe₂O₄polymer nanocomposite films