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Study of the conduction mechanisms in poly-perfluorosulfonated membranes impregnated with intrinsic semiconducting polymers

A. ANDRONIE1,* , S. ANTOHE2, S. IORDACHE1, A. CUCU1, S. STAMATIN1, A. CIOCANEA3, A. EMANDI4, G. NAN5, C. BERLIC5, G. A. RIMBU6, I. STAMATIN1

Affiliation

  1. University of Bucharest, Physics Department, 3Nano-SAE Research Centre, P.O.Box MG-38, 077125 Magurele, Bucharest-Romania
  2. University of Bucharest, Faculty of Physics, Mat&Devices Elect&Optoelctr Center, P.O. Box MG-11, 405 Atomistilor Str., 077125, Magurele, Romania
  3. Polytechnica University of Bucharest, 313 Splaiul Independenţei, 060042, Bucharest, Romania
  4. University of Bucharest, Faculty of Chemistry, Department of Inorganic Chemistry, 23 Dumbrava Rosie Str., RO-010184 Bucharest, Romania
  5. University of Bucharest, Faculty of Physics, P.O. Box MG-11, 405 Atomistilor Str., 077125, Magurele, Romania
  6. INCDIE ICPE-CA, 313 Splaiul Unirii, P. O. Box 149, Bucharest 030138, Romania

Abstract

Electrical conduction mechanisms for poly-perfluorosulfonated membranes with intrinsic conducting polymers (ICP) insertion were investigated as function of relative humidity (RH) at 800 C. Polyaniline, polypyrrole, polythiophene were in situ polymerized using an appropriate couple: monomer-solvent- oxidant. Two mechanisms were identified for the electrical conduction which are dependent of the relative humidity: dissociative- from the sulfonic group contribution and hoppingmigration through the water phase. ICPs with electronic conduction induced by polarons and electron inter-chain hopping have a minor influence on the ionic conduction due to the water interlayer between hydrophobic polymer and hydrophilic perfluorinated matrix. The exception observed is the polypyrrole- polyperfluorosulfonated membrane which led to constant 90-100 mS/cm conductivity not depending on relative humidity. The thermal stability and degradation were investigated by differential scanning calorimetry and thermogravimetric analysis. ICP modified membranes showed an improvement of the onset decomposition temperature from 2900 C to 350- 3700 C depending on ICP polymer type..

Keywords

Perfluorosulfonated membranes, Intrinsic conducting polymers, Conduction mechanisms.

Submitted at: Oct. 14, 2010
Accepted at: Nov. 19, 2010

Citation

A. ANDRONIE, S. ANTOHE, S. IORDACHE, A. CUCU, S. STAMATIN, A. CIOCANEA, A. EMANDI, G. NAN, C. BERLIC, G. A. RIMBU, I. STAMATIN, Study of the conduction mechanisms in poly-perfluorosulfonated membranes impregnated with intrinsic semiconducting polymers, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 11, pp. 2288-2295 (2010)