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Charge‐carrier relaxation dynamics and ac conductivity scaling of poly(3,4‐ethylenedioxythiophene) nanoparticles
Author(s) -
Chutia P.,
Kumar A.
Publication year - 2015
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532318
Subject(s) - materials science , charge carrier , dielectric , conductivity , permittivity , nanoparticle , poly(3,4 ethylenedioxythiophene) , relaxation (psychology) , condensed matter physics , raman spectroscopy , chemical physics , analytical chemistry (journal) , conductive polymer , nanotechnology , chemistry , optoelectronics , polymer , composite material , physics , optics , psychology , social psychology , chromatography
An investigation of the dielectric characteristics of poly(3,4‐ethylenedioxythiophene) nanoparticles has been conducted in the frequency range 20 Hz–2 MHz and the temperature range of 80–300 K through the studies of dielectric permittivity, modulus formalism and ac conductivity. High‐resolution transmission electron micrographs confirm the formation of well‐ordered spherical nanoparticles. Micro‐Raman spectra confirm the conformational transition from benzenoid to quinoid structure with increasing dopant concentration. Linear variation of imaginary permittivity with frequency suggests that the dc conduction process is more significant than interfacial polarisation. The presence of single relaxation peak in the imaginary modulus formalism indicates the Debye‐type relaxation. The decrease of frequency exponent with temperature confirms that the charge transport takes place through correlated barrier hopping mechanism. The scaling of ac conductivity spectra confirms that the relaxation dynamics of charge carriers in the poly(3,4‐ethylenedioxythiophene) nanoparticles system is temperature independent.