Anantharaman, M R; Mathai, C J; Saravanan, S; Jayalekshmi,S; Venkitachalam, S(Elsevier, August 5, 2002)
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Abstract:
Electrical properties of ac plasma polymerized aniline thin films are investigated with a view of determining the dominant
conduction mechanism. The current–voltage (I–V) characteristics in symmetric and asymmetric electrode configuration for
polyaniline thin films in the thickness range from 1300 to 2000 A ° are investigated. From the studies on asymmetric electrode
configuration, it is found that the dominant conduction mechanism in these films is of Schottky type
Anantharaman, M R; Saravanan, S; Joseph, Mathai C; Venkatachalam, S; Avasthi, D K; Singh, F(Elsevier, November 15, 2005)
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Abstract:
Conjugated polymers in the form of thin films play an important role in the field of materials science due to their interesting properties. Polymer
thin films find extensive applications in the fabrication of devices, such as light emitting devices, rechargeable batteries, super capacitors, and
are used as intermetallic dielectrics and EMI shieldings. Polymer thin films prepared by plasma-polymerization are highly cross-linked, pinhole
free, and their permittivity lie in the ultra low k-regime. Electronic and photonic applications of plasma-polymerized thin films attracted the
attention of various researchers. Modification of polymer thin films by swift heavy ions is well established and ion irradiation of polymers can
induce irreversible changes in their structural, electrical, and optical properties. Polyaniline and polyfurfural thin films prepared by RF plasmapolymerization
were irradiated with 92MeV silicon ions for various fluences of 1×1011 ions cm−2, 1×1012 ions cm−2, and 1×1013 ions cm−2.
FTIR have been recorded on the pristine and silicon ion irradiated polymer thin films for structural evaluation. Photoluminescence (PL) spectra
were recorded for RF plasma-polymerized thin film samples before and after irradiation. In this paper the effect of swift heavy ions on the structural
and photoluminescence spectra of plasma-polymerized thin films are investigated.
Anantharaman, M R; Saravanan, S; Venkatachalam, S(Elsevier, August 20, 2006)
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Abstract:
Polyaniline and oligomeric cobalt phthalocyanine are blended in different proportions by chemical methods. These blends are characterised by
spectroscopic methods and dielectric measurements. Dielectric studies on the conducting polymer blends are carried out in the frequency range of
100 kHz to 5MHz from room temperature (300 K) to 373 K. Dielectric permittivity and dielectric loss of these blends are explained on the basis
of interfacial polarisation. From the dielectric permittivity studies, ac conductivity of the samples were calculated and the results are correlated. In
order to understand the exact conduction mechanism of the samples, dc electrical conductivity of the blends is carried out in the temperature range
of 70–300 K. By applying Mott’s theory, it is found that the conducting polymer composites obey a 3D variable range hopping mechanism. The
values of Mott’s temperature (T0), density of states at the Fermi energy (N(EF)), range of hopping (R) and hopping energy (W) for the composites
are calculated and presented
Description:
Materials Science and Engineering B 135 (2006) 113–119