Electrical properties of polyaniline doped with dichloride and trichloride

acetic acids

A. Fattoum1*, W. Dhaoui2, M. Arous3, F. Gmati1, A. El Mansouri4, A. Belhadj Mohamed1, M.E.Achour5

1 1Centre de Recherches et de Technologies de l’Energie, Technopole Borj Cedria, BP 95, Hammam-Lif, Tunisie.

2 Unité de Physico-chimie des Matériaux Solides, Faculté des Sciences de Tunis 2092 El Manar II, Tunisie

3 Laboratoire des Matériaux Composites et Polymères, Faculté des Sciences de Sfax, Tunisie

4Faculté des Sciences Semlalia Université Cadi Ayyad, Marrakech, Maroc

5 Equipe Systèmes, Propagation et Caractérisation des Matériaux, Laboratoire LASTID,

Département de Physique, Faculté des Sciences, B.P:133, 14 000 Kénitra , Maroc

* Corresponding author.

Received: 30 March 2006; revised version accepted: 14 July 2006

Abstract

We report here a study of electrical properties in the frequency range from 300 KHz to 3 GHz of two series of polyaniline doped with dichloride acetic acid (DCA) and trichloride acetic acid (TCA). Measurements were performed on cylindrically shaped pellets (diameter 13 mm and thick 1.5 mm) compressed under 1 GPa.

The objective is to study the complex permittivity e*= e’ – ie’’ by measuring the frequency dependent reflection coefficient by using the open ended coaxial line coupled with a network analyzer.

The response curves exhibit a large relaxation peaks lying in the frequency range from 1.6 MHz to 9 MHz depending on the level and the nature of the doping acid. The dc conductivity varies between 0.22 10-3 S/m and 37.5 10-3 S/m. The ac conductivity in the frequency range above the relaxation frequency is well fitted by the power law sac=A wn, where the exponent n is found between 0.36 and 0.71.

Keywords: Conducting polymers; Conductivity; Permittivity; Relaxation.

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