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Studies of AC conductivity and dielectric relaxation behavior of CdO‐doped nanometric polyaniline
Author(s) -
Roy Aashis S.,
Anilkumar Koppalkar R.,
Prasad M. V. N. Ambika
Publication year - 2011
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.34696
Subject(s) - polyaniline , materials science , dielectric , nanocomposite , dielectric loss , conductivity , doping , composite material , dissipation factor , conductive polymer , nanocrystalline material , polymerization , analytical chemistry (journal) , polymer , chemistry , nanotechnology , organic chemistry , optoelectronics
The Cadmium oxide doped in nanocrystalline polyaniline (CdO/PANI) composite were prepared with various weight percentages by in situ polymerization method using aniline, ammonium per sulfate, and CdO as starting materials. The frequency dependent conductivity and dielectric behavior of PANI/CdO composites have been studied. The formation of nano PANI and PANI/CdO composites with regards to the structural and microstructural properties of the materials were investigated by XRD, FTIR, and SEM techniques. The variation of σ ac with frequency obeys Jonscher power law except a small deviation in the low frequency region and is due to dipole polarization effect. The σ ac increases with increase in CdO concentration. Studies of dielectric properties at lower frequencies show that the relaxation behavior is superimposed by dipole polarization effect. The appearance of peak for each concentration in the loss tangent suggests the presence of relaxing dipoles in the PANI/CdO composite. On addition of CdO, the peak shifts toward higher frequency side indicating the speed up of the relaxation time. Analysis of frequency dependent dielectric suggests that the electronic and polymer segmental motions are strongly coupled. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012