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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 1:58 |
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Conference: Bucharest University Faculty of Physics 2004 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
A MICROSCOPIC ANALYZE OF THE CONDUCTION MECHANISM OF IRON DOPED POLYANILINE UNDER THE UV EXPOSURE
Authors:
C. Valsangiacom1, M. Sima1, D. Predoi1, C. Plapcianu1,
C. Kuncser2, G. Schinteie1 and M. Bulinski3
Affiliation:
1 National Institute for Physics of Materials, PO Box MG 7, 7600, Bucharest, Romania
2 Industrial /Educational Group Nicolae Teclu ¡V Bucharest,Romania
3 University of Bucharest, Faculty of Physics, departament of Optics PO Box MG 7, 7600, Bucharest, Romania
E-mail
mbulinsky@lycos.com
Keywords:
conducting polimers, polarons, UV exposure
Abstract:
The major target of conductive polymer technology development has been to combine the electrical and optical properties of conducting materials with the mechanical and processability properties of commodity bulk polymers.
Polyaniline was synthesized at ¡V 15„aC using a polyethylenglycole / ice bath and doped with Fe3+ ions. Polyaniline films (tenths of ƒÝm) were prepared by the gravity method. The dried films were exposed to UV (300nm <ƒÜ< 500nm, 10mW/cm2), up to 25 min. The conduction mechanism vs. the exposure time was analyzed by resistivity measurements and Mossbauer spectroscopy.
Mossbauer measurements show that by applying the UV exposure, electrons from the polymer chains are trapped by the Fe ions, changing their valence from Fe3+ to Fe2+. Corroborating this effect with the decreasing trend of the resistance in the UV exposed Fe doped polyaniline, it results directly that the polarons are the charge carries in the analysed films and the final effect of the UV light is to increase their concentration.
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