A.c. conductivity of poly( N-methylpyrrole)

The dielectric constant ɛ′(ω) and measured a.c. conductivity σ m(ω) of lightly doped poly ( N-methylpyrrole) films have been investigated in the temperature range 77–350 K and in the frequency range 100 Hz–1 MHz. In the low-temperature region the measured a.c. conductivity can be described by the re...

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Bibliographic Details
Published in:Synthetic metals 1996-08, Vol.82 (1), p.63-70
Main Authors: Singh, Ramadhar, Narula, Amarjeet K., Tandon, R.P.
Format: Article
Language:English
Subjects:
Applied sciences
Conductivity
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Poly( N-methylpyrrole)
Properties and characterization
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Summary:The dielectric constant ɛ′(ω) and measured a.c. conductivity σ m(ω) of lightly doped poly ( N-methylpyrrole) films have been investigated in the temperature range 77–350 K and in the frequency range 100 Hz–1 MHz. In the low-temperature region the measured a.c. conductivity can be described by the relation σ(ω) = Aω s, where the exponent s is found to be less than unity. At high temperatures the conductivity remains strongly frequency dependent but the dependence becomes weak at low frequencies. The temperature and frequency dependences of a.c. conductivity σ(ω) can be qualitatively explained by the contributions from two mechanisms, one giving rise to a broad dielectric loss peak having a distribution of relaxation times, and the other giving a linear dependence of conductivity on frequency.
ISSN:0379-6779
1879-3290
DOI:10.1016/S0379-6779(97)80011-2