Bulg. J. Phys. vol.29 no.1-2 (2002), pp. 78-81

The Role of Hydrostatic Pressure on the D.C. Conductivity of Fresh and Thermally Aged Polypyrrole-Polyaniline Conductive Blends

A. Papathanassiou1, J. Grammatikakis1, I. Sakellis1, S. Sakkopoulos2, E. Vitoratos2, E. Dalas3
1Department of Physics, University of Athens Panepistimiopolis, GR 15784 Zografos, Athens, Greece
2Department of Physics, University of Patras, GR 26500 Patras, Greece
3Department of Chemistry, University of Patras, GR 26500 Patras, Greece
Abstract. In the present work we investigate the effect of hydrostatic pressure on the electrical conductivity of polypyrrole-polyaniline conductive(protonated) blends of various compositions. Results are presented for thermally aged blends, as well. The modification of the conductivity on pressure is more pronounced in the fresh samples than in the de-doped ones. The phenomenon is discussed within the frame of the granular metal. The percentage variation of the conductivity upon pressure variation for the polypyrrole rich blends is not influenced from the aging process. This feature suggests that these blends could possibly be used as pressure sensors, which are insensitive to the thermal aging.

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