Anantharaman, M R; Venkitachalam, S; Saravanan, S; Rajeev, Ashokan R; Joseph, Mathai C; Sajeev, U S(Springer India, January 10, 2006)
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Abstract:
Polyaniline is a widely studied conducting polymer and is a useful material in its bulk and thin
film form for many applications, because of its excellent optical and electrical properties. Pristine and iodine
doped polyaniline thin films were prepared by a.c. and rf plasma polymerization techniques separately for the
comparison of their optical and electrical properties. Doping of iodine was effected in situ. The structural
properties of these films were evaluated by FTIR spectroscopy and the optical band gap was estimated from
UV-vis-NIR measurements. Comparative studies on the structural, optical and electrical properties of a.c. and
rf polymerization are presented here. It has been found that the optical band gap of the polyaniline thin films
prepared by rf and a.c. plasma polymerization techniques differ considerably and the band gap is further reduced
by in situ doping of iodine. The electrical conductivity measurements on these films show a higher value
of electrical conductivity in the case of rf plasma polymerized thin films when compared to the a.c. plasma polymerized
films. Also, it is found that the iodine doping enhanced conductivity of the polymer thin films considerably.
The results are compared and correlated and have been explained with respect to the different
structures adopted under these two preparation techniques
Description:
Bull. Mater. Sci., Vol. 29, No. 2, April 2006, pp. 159–163