Electric modulus based relaxation dynamics, ac-conductivity and I–V characteristics in PTh/[Co(EDTA)NH3Cl] H2O nanocomposite prepared by chemical oxidation method

A thread like nanocomposite material based on PTh/[Co(EDTA)NH 3 Cl] H 2 O has been successfully prepared by in-situ chemical oxidative polymerization for the investigation of dielectric properties. XRD reflects its crystalline nature with a particle size of 40 nm. TEM clearly showed a two phase syst...

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Bibliographic Details
Published in:Journal of materials science. Materials in electronics 2017-08, Vol.28 (15), p.11243-11252
Main Authors: Najar, Mohd. Hanief, Majid, Kowsar, Dar, M. Abdullah
Format: Article
Language:English
Subjects:
Aspect ratio
Binary systems
Characterization and Evaluation of Materials
Chemistry and Materials Science
Crystal structure
Current voltage characteristics
Dielectric properties
Direct current
Dynamical systems
Electrical resistivity
Electromagnetic interference
Energy storage
Ethylenediaminetetraacetic acids
Formalism
High frequencies
Materials Science
Nanocomposites
Optical and Electronic Materials
Oxidation
Particle size
Permittivity
Polarization
Polymerization
Shielding
Thermal stability
Thermogravimetry
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Summary:A thread like nanocomposite material based on PTh/[Co(EDTA)NH 3 Cl] H 2 O has been successfully prepared by in-situ chemical oxidative polymerization for the investigation of dielectric properties. XRD reflects its crystalline nature with a particle size of 40 nm. TEM clearly showed a two phase system consisting of [Co(EDTA)NH 3 Cl] H 2 O (photoadduct) particles immersed in PTh threads. Thermogravimetry exhibits an increase in its thermal stability than pristine PTh. Enhanced dielectric constant of around (ε′ = 500 at 10 4  Hz) has been observed than many other systems reported recently. This is of conducive value for energy storage and has been attributed to (1) Maxwell–Wagner interfacial polarization and (2) increased aspect ratio due to the thread like structure. Moreover, the losses observed in the material are dominated by dc-conduction as has been confirmed by the electric modulus formalism. Frequency dependent conductivity (σ ac ) has been found to be of higher value (~10 8  S/m), which saturates at high frequencies. Electric modulus formalism shows a change over from dc- to ac-conduction. I–V characteristics showed a typical ohmic behavior of nanocomposite with a resistance of 2.7 × 10 4  Ω, thereby excluding RS/PF or SCLC conduction mechanisms. Such a material can provide absorption and reflection to EMI shielding.
ISSN:0957-4522
1573-482X
DOI:10.1007/s10854-017-6913-7