Synthesis, characterization and low frequency AC conduction of polyaniline/niobium pentoxide composites

Ravikiran, Y. T.; Lagare, M.T.; Sairam, M.; Mallikarjuna, N. N.; Sreedhar, B.; Manohar, Sanjeev K.; MacDiarmid, Alan G.; Aminabhavi, Tejraj M.

doi:10.1016/j.synthmet.2006.08.005

Cited by 112 publications

(26 citation statements)

References 39 publications

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“…In dielectric analysis, dielectric constant at high frequencies is associated with dipolar relaxation and at low frequencies, the dielectric constant is associated with interfacial polarization and DC conductivity. 25 The increase in the dielectric constant at low frequencies reveals that system exhibits strong interfacial polymerization. Interfacial polarization occurs when there is an accumulation of charge between the two conductive and insulating regions within the material when electric field is applied.…”

Section: Dielectric Measurementmentioning

confidence: 99%

Temperature characterization of dielectric permittivity and AC conductivity of nano copper oxide-doped polyaniline composite

Shubha

Rao

2016

J. Adv. Dielect.

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The polyaniline/copper oxide (PANI/CuO) nanocomposite was prepared by mixing solutions of polyaniline and copper oxide nanoparticles in dimethyl sulfoxide (DMSO). The synthesized polymer nanocomposites were characterized by X-ray powder diffraction (XRD), scanning electron microscope (SEM) and UV-visible spectroscopy. The characteristic peaks in XRD and UVvisible spectra confirmed the presence of CuO in the polymer structure. SEM images indicated morphological changes in the composite matrix as compared to the pristine PANI. The DC conductivity measurements were performed using two-probe method for various temperatures. AC conductivity and dielectric response of the composites were investigated in the frequency range of 10 2 -10 6 Hz using LCR meter. Dielectric permittivity 0 ðwÞ and dielectric loss factor 00 ðwÞ were investigated. It was observed that 0 ðwÞ and 00 ðwÞ decrease with increase in frequency at all temperatures. At a particular frequency it is observed that both 0 ðwÞ and 00 ðwÞ increase with increase in temperature. It was also observed that AC conductivity increased with increase in frequency and temperature.

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Section: Dielectric Measurementmentioning

confidence: 99%

Temperature characterization of dielectric permittivity and AC conductivity of nano copper oxide-doped polyaniline composite

Shubha

Rao

2016

J. Adv. Dielect.

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“…Higher loss (tanδ) at lower frequency in dielectric may be attributed to DC conduction losses. 30 The value of dielectric loss is low in the entire frequency region. The characteristics of low value of dielectric loss exhibit that the materials posses good optical quality with lesser defects which play a vital role for the fabrication of non-linear optical devices.…”

Section: Optical Analysismentioning

confidence: 99%

Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties

Abdullah¹,

Rajab²,

Al-Abbas³

2014

AIP Advances

194

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Articles you may be interested inThe Cr-substitution concentration dependence of the structural, electric and magnetic behaviors for Aurivillius Bi5Ti3FeO15 multiferroic ceramics J. Appl. Phys. 114, 234101 (2013); 10.1063/1.4849055Conversion of CH4/CO2 to syngas over Ni-Co/Al2O3-ZrO2 nanocatalyst synthesized via plasma assisted coimpregnation method: Surface properties and catalytic performance Synthesis of TiO 2 nanoparticles by hydrolysis and peptization of titanium isopropoxide solution AIP Conf.The structural, optical and dielectric properties of as-grown Cr 2 O 3 nanostructures are demonstrated in this paper. Powder X-ray diffractometry analysis confirmed the rhombohedral structure of the material with lattice parameter, a = b = 4.953 Å; c = 13.578 Å, and average crystallize size (62.40 ± 21.3) nm. FE-SEM image illustrated the mixture of different shapes (disk, particle and rod) of as-grown nanostructures whereas; EDS spectrum confirmed the elemental purity of the material. FTIR spectroscopy, revealed the characteristic peaks of Cr-O bond stretching vibrations. Energy band gap (3.2 eV) of the nanostructures has been determined using the results of UV-VIS-NIR spectrophotometer. The dielectric properties of the material were checked in the wide frequency region (100Hz-30 MHz). In the low frequency region, the matrix of the dielectric behaves like source as well as sink of electrical energy within the relaxation time. Low value of dielectric loss exhibits that the materials posses good optical quality with lesser defects. The ac conductivity of the material in the high frequency region was found according to frequency power law. The physical-mechanism and the theoretical-interpretation of dielectric-properties of Cr 2 O 3 nanostructures attest the potential candidature of the material as an efficient dielectric medium. C 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.

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“…The dielectric parameters and conductivity were used to obtain more detailed information with regard to the microscopic structure of the composites. These values were calculated from the capacitance and conductance using the following equations: [32][33][34][35][36][37][38] e 0 ¼ C p material where e¢ and e 00 are the real and imaginary parts of the complex dielectric constant e * . The real part measures the alignment of the dipoles, and the imaginary part represents the energy required to align the dipoles and move the ions.…”

Section: Electrical and Dielectric Propertiesmentioning

confidence: 99%

Polyaniline-doped benzene sulfonic acid/epoxy resin composites: structural, morphological, thermal and dielectric behaviors

Belaabed

Lamouri

Naar

et al. 2010

Polym J

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Conducting polymer composites, which are simply physical mixtures of an insulating polymer matrix and intrinsically conducting polymers, are promising new materials for various applications such as antistatic coatings, shielding and electromagnetic absorbers. In this context, a novel conducting composite was successfully produced. It is based on epoxy resin and polyaniline (PANI) doped in benzene sulfonic acid, which was used as conducting filler. The effect of PANI loading levels on the structural, morphological, thermal, electrical and dielectric properties was explored using techniques, such as Raman, Fourier transform infrared and ultraviolet-visible-NIR spectroscopy, X-ray diffraction, atomic force microscopy, scanning electron microscopy, thermogravimetric analysis and differential scanning calorimetry. The electrical behavior and morphology of the synthesized PANI revealed disorder and defects. In addition, as the applied voltage is increased, the current through the sample increases rapidly. The conductivity and dielectric properties were also investigated at room temperature in the frequency range of 1 MHz-1 GHz. The dielectric constant was shown to increase with increased loading at low frequencies and then decreases rapidly, reaching a constant value at higher frequencies. In addition, the AC conductivity of the prepared composites increases with the addition of PANI and is higher at high frequencies. Furthermore, the stability of the composites was found to be influenced by increasing the amount of PANI filler in the matrix.

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Synthesis, characterization and low frequency AC conduction of polyaniline/niobium pentoxide composites

Cited by 112 publications

References 39 publications

Temperature characterization of dielectric permittivity and AC conductivity of nano copper oxide-doped polyaniline composite

Temperature characterization of dielectric permittivity and AC conductivity of nano copper oxide-doped polyaniline composite

Structural and optical characterization of Cr2O3 nanostructures: Evaluation of its dielectric properties

Polyaniline-doped benzene sulfonic acid/epoxy resin composites: structural, morphological, thermal and dielectric behaviors

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