Conducting polymers. VI. Effect of doping with iodine on the dielectrical and electrical conduction properties of polyacrylonitrile

El-Ghamaz, N.A.; Diab, M.A.; Zoromba, M. Sh.; El‐Sonbati, A.Z.; El-Shahat, O.

doi:10.1016/j.solidstatesciences.2013.07.016

Cited by 33 publications

(19 citation statements)

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“…10. The values of S are found to decrease with increasing temperature [53,59]. Such a behavior can be explained in terms of hopping process of charge carriers between localized sites and suggests that the correlated barrier hopping (CBH) model is the best suitable model for the conduction mechanism [59].…”

Section: Dielectrical Properties Of Panaa and Panaa-ni Compsoitesmentioning

confidence: 92%

“…Both of e r and e i values increase with increasing the temperature. The increase of e r and e i with increasing temperature behavior is observed for many organic [48,49,53] and inorganic compounds [54]. The AC conductivity (r ac ) of PANAA (Z 0 ) copolymer can be calculated from the following equation [48-51, 53, 55]:…”

Section: Dielectrical Properties Of Panaa and Panaa-ni Compsoitesmentioning

confidence: 99%

“…The values of r ac as a function of temperature and frequency for PANAA (Z 0 ) copolymer and PANAANi composite (Z 2 ) were investigated in the temperature range 300-583 K, and in frequency range 0.1-100 kHz. The temperature dependence of r ac could be followed Arrhenius relation [53,[55][56][57]:…”

Section: Dielectrical Properties Of Panaa and Panaa-ni Compsoitesmentioning

confidence: 99%

“…Such a behavior can be explained in terms of hopping process of charge carriers between localized sites and suggests that the correlated barrier hopping (CBH) model is the best suitable model for the conduction mechanism [59]. In CBH model, the electrons in charged defect states, hop over the Coulomb barrier whose height W, is given by [51,53]:…”

Section: Dielectrical Properties Of Panaa and Panaa-ni Compsoitesmentioning

confidence: 99%

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Effect of Doping with Nickel Ions on the Electrical Properties of Poly(aniline-co-o-anthranilic acid) and Doped Copolymer as Precursor of NiO Nanoparticles

Zoromba

El-Ghamaz

Alghool

2015

J Inorg Organomet Polym

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Poly(aniline-co-o-anthranilic acid) (PANAA) and its nickel composite (PANAA-Ni) are successfully prepared based on oxidative chemical polymerization via two comparative in situ and ex situ polymerization methods. PANAA copolymer contains aniline, and o-anthranilic acid moieties, were doped with different concentrations of nickel ions. The ratios of aniline, o-anthranilic acid, and nickel chloride were (1:1:0.5) and (1:1:1), respectively. The effect of nickel moiety on the properties of polyconjugated polymers, and their spectral characteristics (UVVis absorption spectra, FTIR, thermal stability) were recorded. TGA analysis confirmed that the poly(aniline-coo-anthranilic acid)/nickel (PANAA-Ni) composites, which were prepared by in situ or ex situ polymerization method, are more thermally stable than the pure PANAA copolymer. The XRD revealed that the pure and PANAA-Ni (prepared by ex situ polymerization method) is completely amorphous structure, while the PANAA-Ni composite (prepared by in situ polymerization method) is a mixture of crystalline and amorphous phases. The temperature dependence of dielectric constants (e r and e i ) as well as AC conductivity (r ac ) were investigated in the temperature range of 300-383 K and test frequency range of 0.1-100 kHz. All the tested samples showed semiconductor behavior. The values of thermal activation energies DE1 and DE2 for PANAA copolymer are calculated, and found to be in the range of 0.03-0.1 eV and 0.58-1.88 eV, respectively. We calculated DE1 and DE2 for PANAA-Ni composite, and we found their values in the range of 0.14-0.27 eV and 0.41-0.58 eV, respectively. Moreover, Nanocrystalline nickel oxide NiO powder was prepared by thermal decomposition route of (PANAA-Ni) composites, which was prepared by in situ polymerization method. The size of the obtained nickel oxide nanoparticle was determined by transmission electron microscope .

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Section: Dielectrical Properties Of Panaa and Panaa-ni Compsoitesmentioning

confidence: 92%