Preparation and evaluation of microstructure, dielectric and conductivity (ac/dc) characteristics of a polyaniline/poly N-vinyl carbazole/Fe3O4 nanocomposite

Haldar, Ipsita; Biswas, Mukul; Nayak, A.

doi:10.1007/s10965-012-9951-0

Cited by 16 publications

(4 citation statements)

References 39 publications

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“…The relationship between permittivity imaginary dielectric and the frequency is related to the thermal energy caused by the exchange of the local polarization of the material with the external field [20]. and 5 show that all samples experience a very significant decrease in the value of the dielectric permittivity (real and imaginary) in the low-frequency range ranging from 10-250 kHz, then starts to be constant at frequencies greater than 250-900 kHz [18,21]. Frequency dependence is due to interfacial polarization as predicted by Maxwell-Wagner and Koop's phenomenological theory and Rezlescu model [22].…”

Section: Resultsmentioning

confidence: 99%

“…Figure 3. Tauc Plot (𝛼𝛼ℎ𝑣𝑣) 2 versus energy (eV) of Fe3O4-MO5 (a), Fe3O4-MO10 (b), Fe3O4-MO15(c), and Fe3O4-MO20 (d) Dielectric properties of Fe3O4 nanoparticles were measured at room temperature with a frequency range of 10-900 kHz using computerized impedance spectroscopy in the form of real dielectric (ε'), imaginary dielectric (ε''), and tangent loss (𝛿𝛿)[18].…”

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confidence: 99%

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Dielectrics and Optical Properties of Green-Synthesized Fe3O4 Nanoparticles

Sitorus

Tumbelaka

Istiqomah

et al. 2023

KEM

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The magnetite (Fe3O4) nanoparticles have been green-synthesized using Moringa Oleifera extract (MO) with variations of 5, 10, 15, and 20 ml. The X-ray diffraction results confirmed that the microstructure of Fe3O4 nanoparticles is a cubic inverse spinel structure with an average particle size of 5.0-8.9 nm and lattice parameters in the range of 8.14-8.22 Å. The results of UV-VIS data presented that the absorption edges of Fe3O4 MO 5 ml were 193.4 nm and the band gap energy of Fe3O4-MO is in the range of 2.62-3.31 eV. Dielectric properties were measured using impedance spectroscopy in the frequency range of 10-900 kHz. The results of measurement were in the form of real dielectric (ε'), imaginary dielectric (ε''), and tangent loss (tan δ). The dielectric constant decreased with increasing frequency due to interfacial polarization. In addition, MO affected the dielectric properties of Fe3O4 nanoparticles. The dielectrics of green-synthesized Fe3O4 with various MO of 5, 10, 15, and 20 ml at a frequency of 10 kHz are 248.5, 276.9, 289.0, and 308.1, respectively. The results measurement of the dielectric properties showed the optimality of the green synthesized sample with MO concentrations of 10 and 15 ml with values of 276.9 and 289.0 at a frequency of 10 kHz. So, green synthesis Fe3O4 magnetite nanoparticles are used for Surface Plasmon Resonance (SPR) and Electromagnetic Interference (EMI) Shielding because these two applications are dependent on frequency and dielectric constant.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

Dielectrics and Optical Properties of Green-Synthesized Fe3O4 Nanoparticles

Sitorus

Tumbelaka

Istiqomah

et al. 2023

KEM

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“…5. The AC conductivity of solid electrolytes is firmly dependent on the structural disorder of samples and doping procedure [36,37]. The highest conductivity for KCl-doped ionic system was obtained at higher frequency as shown in figure.…”

Section: Frequency Dependence Of Ac Conductivity Analysismentioning

confidence: 94%

Impedance spectroscopy and conductivity studies of KCl-doped solid electrolyte

Wani

Rafiuddin

2018

J Theor Appl Phys

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(CuCl) 4-2x-(KCl) x-CdCl 2 , x = 0.0-0.4 solid electrolytes were grown via solid-state reaction procedure by suitable heat treatment. An AC impedance spectroscopy suggested that the ionic conductivity mainly arisen from grain effect. A DC electrical conductivity of 3.94 9 10-5 Scm-1 was measured for the x = 0.3 composition at 320°C. This also shows lowest activation energy in the temperature range of 293-593 K. This has been explained by that fact that at high temperatures thermal disturbances through lattice vibrations take place. In such a high-temperature region, Cu ? readily jumps and migrates at short range, but the number of mutual collisions also increases resulting in a decrease of the Cu ? mobility. The present study reveals that the change in conductivity value depends on concentration of doped ingredient as well as on various parameters in the system. Therefore, these solid electrolytes will be suitable for the development of different electrochemical applications.

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“…Incorporation of metal oxide nanoparticles into the conducting polymers minimizes the penetration of these corrosive ions and enhances the corrosion resistance. In the past, several oxide nanoparticles such as; alumina (Al 2 O 3 ) [5], manganese dioxide (MnO 2 ) [6], vanadium pentoxide (V 2 O 5 ) [7], titania (TiO 2 ) [8], ferric oxide (Fe 2 O 3 ) [9], tungsten oxide (WO 3 ) [10], zinc oxide (ZnO) [11], silica (SiO 2 ) [12] and zirconia (ZrO 2 ) [13] were incorporated into CP matrix and its corrosion protecting ability was explored. For instance, poly (o-toluidine) /ZrO 2 nanocomposite coating was effective to control the corrosion rate of mild steel [14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Anticorrosive Properties of Novel PVK-ZrO2 Nano Composite Coatings on Steel-Substrate

Elangovan

Pugalmani

Arthanari

et al. 2018

e-J. Surf. Sci. Nanotech.

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A novel nanocomposite coating containing poly (N -vinyl carbazole) (PVK) and zirconia (ZrO2) nanoparticles was synthesized using chronoamperometry. The effect of ZrO2 nano particles into the PVK matrix and its mechanical, corrosion protection ability on 316L SS substrates were studied. The incorporation of the nanoparticles was endorsed by attenuated total reflectance infrared spectroscopy (ATR-IR) and EDAX analysis. The spheroidal morphology and core-shell structure were revealed with scanning electron microscopy (SEM) and transmission electron microscopy (TEM) techniques. The thermal studies exhibited the stability of coating. The anticorrosion performance of PVK-ZrO2 nanocomposite coatings in 3.5 weight (wt.)% NaCl medium was performed with potentiodynamic polarization technique and electrochemical impedance spectroscopy (EIS) studies. The corrosion rate of PVK-ZrO2 nanocomposite coated 316L SS was found to be 0.58 times lower than uncoated 316L SS and a significant decrease in corrosion potential was realized from −0.211 VSCE for uncoated 316L SS to 0.112 VSCE for PVK-ZrO2 nanocomposite coated 316L SS substrates. The results of this study clearly ascertain that the PVK-ZrO2 nanocomposite has an outstanding potential to protect 316L SS against corrosion in a 3.5 wt.% NaCl environment.

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Preparation and evaluation of microstructure, dielectric and conductivity (ac/dc) characteristics of a polyaniline/poly N-vinyl carbazole/Fe3O4 nanocomposite

Cited by 16 publications

References 39 publications

Dielectrics and Optical Properties of Green-Synthesized Fe<sub>3</sub>O<sub>4</sub> Nanoparticles

Dielectrics and Optical Properties of Green-Synthesized Fe<sub>3</sub>O<sub>4</sub> Nanoparticles

Impedance spectroscopy and conductivity studies of KCl-doped solid electrolyte

Synthesis and Anticorrosive Properties of Novel PVK-ZrO<sub>2 </sub>Nano Composite Coatings on Steel-Substrate

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