Effect of molybdenum trioxide (MoO3) on the electrical conductivity of polyaniline

Anilkumar, Koppalkar R.; Parveen, Ameena; Badiger, G.R.; Prasad, M. V. N. Ambika

doi:10.1016/j.physb.2009.01.046

Cited by 32 publications

(11 citation statements)

References 9 publications

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“…increased with increasing temperature indicates typical semiconducting behavior. Similar observation was reported by Anilkumar et al 38 Considering the effect of preparation methods, intrinsic properties such as molecular weight, morphology and crystallinity, and extrinsic properties such as the dopants, the conductivity of polyaniline varies between standard polymer (10 -9 S cm , described by variable range hopping model. A linear variation was observed in the graph of ln ρ(T) with T −1/4 throughout the entire temperature range indicating the three-dimensional hopping transport property (Fig.…”

Section: Methodssupporting

confidence: 84%

Electrical Conductivity, Dielectric Behavior and EMI Shielding Effectiveness of Polyaniline-Yttrium Oxide Composites

Faisal¹,

Khasim²

2013

Bulletin of the Korean Chemical Society

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Polyaniline-yttrium trioxide (PAni-Y 2 O 3 ) composites were synthesized by the in-situ polymerization of aniline in the presence of Y 2 O 3 . The composite formation and structural changes in these composites were investigated by X-ray diffraction (XRD), Fourier transform infra red spectroscopy (FTIR), scanning electron microscopy (SEM) and high resolution transmission electron microscopy (HRTEM). The direct current (DC) electrical conductivity of the order of 0.51 × 10 −2 S cm −1 -0.283 S cm −1 in the temperature range 300 K-473 K indicates semiconducting behavior of the composites. Room temperature AC conductivity and dielectric response of the composites were studied in the frequency range of 10 Hz to 1 MHz. The variation of AC conductivity with frequency obeyed the power law, which decreased with increasing weight percentage (wt %) of Y 2 O 3 . Studies on dielectric properties shows the relaxation contribution coupled by electrode polarization effect. The dielectric constant and dielectric loss in these composites depend on the content of Y 2 O 3 with a percolation threshold at 20 wt % of Y 2 O 3 in PAni. Electromagnetic interference shielding effectiveness (EMI SE) of the composites in the frequency range 100 Hz to 2 GHz was in the practically useful range of -12.2 dB to -17.2 dB. The observed electrical and shielding properties were attributed to the interaction of Y 2 O 3 particles with the PAni molecular chains.

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Section: Methodssupporting

confidence: 84%

Electrical Conductivity, Dielectric Behavior and EMI Shielding Effectiveness of Polyaniline-Yttrium Oxide Composites

Faisal¹,

Khasim²

2013

Bulletin of the Korean Chemical Society

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“…The microscopic conductivity depends upon the doping level and conjugation length or chain length, whereas the macroscopic conductivity depends on the inhomogeneities in the composites, compactness of pellets and orientation of microparticles, etc. This type of trend has been observed in the other conducting polymer‐based systems 28–31 and is attributed to the polarization of the charge carriers and may also be due to the existence of interface nano‐trapping levels effectively interacting with the polaronic states. It is observed that AC conductivity of PPy–TiO 2 nanocomposite increases upto 15 wt% of TiO 2 which could be due to extension of PPy chain length that facilitate the hopping of polarons between favourable sites.…”

Section: Resultssupporting

confidence: 63%

AC conductivity and dielectric spectroscopic studies of polypyrrole–titanium dioxide hybrid nanocomposites

Kumar

Sarmah

2011

Physica Status Solidi (a)

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Dielectric spectroscopy and AC conductivity measurements have been employed to investigate the electrical properties of disordered materials in a wide range of temperature. In this work, conducting polypyrrole–titanium dioxide (PPy–TiO2) hybrid nanocomposites have been synthesized by oxidizing pyrrole in presence of different concentration (wt%) of TiO2 nanoparticles. Thermal stability of the nanocomposites increases with the increase in TiO2 wt%. The dielectric and electric modulus studies of as prepared samples were carried out over a frequency range of 42 Hz–5 MHz. The dielectric constant and dielectric loss for all the nanocomposite samples were observed to decrease with the increase of frequency. Electric modulus analysis has been carried out to understand the electrical relaxation processes. The dielectric relaxation time of nanocomposites decreases with the increase of TiO2 nanoparticles concentration. AC conductivity measurements show that correlated barrier hopping conduction mechanism can be employed for pure PPy and PPy‐5 wt% TiO2 nanocomposites, whereas large polaron tunnelling mechanism is applicable for higher concentration of TiO2 (10–25 wt%) in PPy–TiO2 nanocomposites.

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“…The constant tangent loss for all nanocomposites after 10 6 Hz indicates that they act as lossless materials after this frequency range. Therefore, it is believed that with the addition of ZnO, there is an increase in the crystalline content in the materials and this is well supported by XRD analysis [22]. The lowest concentration of 0.5 wt.% of ZnO loaded in PVA nanocomposites demonstrate subtle change in the measured applied frequencies as compared with other weight percentages at room temperature.…”

Section: Dielectric Property Of the Compositesmentioning

confidence: 64%

Dielectric properties of novel PVA/ZnO hybrid nanocomposite films

Roy

Gupta

Sindhu

et al. 2013

Composites Part B: Engineering

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216

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Effect of molybdenum trioxide (MoO3) on the electrical conductivity of polyaniline

Cited by 32 publications

References 9 publications

Electrical Conductivity, Dielectric Behavior and EMI Shielding Effectiveness of Polyaniline-Yttrium Oxide Composites

Electrical Conductivity, Dielectric Behavior and EMI Shielding Effectiveness of Polyaniline-Yttrium Oxide Composites

AC conductivity and dielectric spectroscopic studies of polypyrrole–titanium dioxide hybrid nanocomposites

Dielectric properties of novel PVA/ZnO hybrid nanocomposite films

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