Browsing by Author "Anantharaman, MR"

Now showing 1 - 2 of 2
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    Investigations on the mechanism of carrier transport in plasma polymerized pyrrole thin films
    (JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 2010) John, J; Sivaraman, S; Jayalekshmy, S; Anantharaman, MR
    Plasma polymerization is found to be an excellent technique for the preparation of good quality, pinhole-free, polymer thin films from different monomer precursors. The present work describes the preparation and characterization of polypyrrole (PPy) thin films by ac plasma polymerization technique in their pristine and in situ iodine doped forms. The electrical conductivity studies of the aluminium-polymer-aluminium (Al-polymer-Al) structures have been carried out and a space charge limited conduction (SCLC) mechanism is identified as the most probable mechanism of carrier transport in these polymer films. The electrical conductivity shows an enhanced value in the iodine doped sample. The reduction of optical band gap by iodine doping is correlated with the observed conductivity results. (C) 2010 Elsevier Ltd. All rights reserved.
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    Studies on the nonlinear optical properties of rf plasma polymerized aniline thin films by open aperture z-scan technique
    (SYNTHETIC METALS, 2010) Sajeev, US; Nambuthiri, VV; Salah, A; Nampoori, VPN; Anantharaman, MR
    Plasma polymerized polyaniline (PANI) thin films in their pristine and iodine doped forms were subjected to open aperture z-scan studies in order to investigate the nonlinear optical (NLO) properties of these materials. The investigations were carried out using a Q-switched resonant Nd:YAG laser at a wavelength of 532 nm for various fluences. The z-scan studies revealed that RF PANI thin films exhibit a saturable absorption (SA). Iodine doping modifies the NLO characteristics of these films substantially. These results qualify PANI thin films as potential materials for NLO materials. Investigations on the NLO properties of pristine (PANI) and iodine doped polyaniline (dPANI) thin films in its plasma polymerized form are reported for the first time. (C) 2010 Elsevier B.V. All rights reserved.