International Journal of Physics | Vol. 1, No. 3, March 2010 | pp. 17–24
Research Article
Title: Dielectric Relaxation and AC Conductivity in Polyaniline-Titanium Dioxide Nanocomposites
Names of Authors: G. H. Nair¹, H. I. Rao², I. J. Kumar¹
Authors’ Affiliations: ¹Department of Physics, Cochin University of Science and Technology, Kochi, India; ²Department of Materials Science, National Institute of Technology, Warangal, India
Abstract: Polyaniline-TiO₂ nanocomposites with varying weight percentages (10 wt% to 40 wt%) of titanium dioxide nanoparticles were synthesized via an in-situ chemical oxidative polymerization technique. The frequency-dependent AC conductivity sigma_ac(omega) and dielectric permittivity epsilon' were measured in the frequency range of 10² Hz to 10⁶ Hz at room temperature (298 K). Analysis of the dielectric data reveals a Maxwell-Wagner-Sillars type interfacial polarization contributing to a large dielectric constant value exceeding epsilon' = 4.5 × 10³ at low frequencies. The AC conductivity follows the universal power law sigma_ac(omega) = A0 × omega^s, where the exponent s decreases from 0.94 to 0.62 with increasing temperature and filler concentration, supporting a correlated barrier hopping (CBH) charge transport model. X-ray diffraction and FTIR spectroscopy validate the homogeneous incorporation of anatase TiO₂ phases within the amorphous polyaniline matrix, showing peak crystallite sizes d = 18.4 nm.
Keywords: Nanocomposites, Polyaniline, Titanium dioxide, Dielectric relaxation, AC conductivity
Manuscript Timeline: Received 05 December 2009, Revised 10 January 2010, Accepted 18 January 2010, Published 01 March 2010
Citation: Nair, G. H., Rao, H. I., & Kumar, I. J. (2010). Dielectric Relaxation and AC Conductivity in Polyaniline-Titanium Dioxide Nanocomposites. International Journal of Physics, 1(3), 17–24. DOI: 10.46882/2010/IJP/000003
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