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Frequency‐dependent conductivity and dielectric permittivity of polyaniline/CeO 2 composites
Author(s) -
Parvatikar Narsimha,
Ambika Prasad M. V. N.
Publication year - 2006
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.22950
Subject(s) - polaron , materials science , polyaniline , dielectric , composite material , conductivity , polymerization , conductive polymer , dielectric loss , permittivity , composite number , polymer , polymer chemistry , chemistry , physics , optoelectronics , quantum mechanics , electron
Abstract The PANI/CeO 2 composites were synthesized using in situ deposition technique by placing fine graded CeO 2 in polymerization mixture of aniline. This is the single step polymerization process for the direct synthesis of emeraldine salt phase of polymer. Low frequency dielectric studies were carried out on pressed pellets of PANI/CeO 2 with various concentrations of cerium oxide (10, 20, 30, 40, and 50 wt % of CeO 2 in PANI). The results are interpreted in terms of polarons and bipolarons, which are responsible for the dielectric relaxation mechanism and frequency dependence of conductivity. It is found that a.c. measurements at room temperature may well serve as a parallel way to the time consuming d.c. conductivity versus temperature technique, to detect the thermal degradation of the transport properties in conducting polymers. It is observed that the charge motion via creation/annihilation of polarons and bipolarons increases as the weight percentage of the composite is increased. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 1403–1405, 2006