Microwave conductivity measurements of high conductive polyaniline films

¹ Laboratoire de Physique des Interactions Ondes-Matières, UMR CNRS 5501, ENSCPB, 16 avenue Pey Berland, 33607 Pessac, France
² Département de Physique, Faculté des Sciences de Tunis, 2092 Tunis El Manar, Tunisia
³ PANIPLAST, Parc scientifique UNITEC 2, 351 cours de la libération, 33405 Talence, France

Corresponding author: jl.miane@enscpb.fr

Received: 24 September 2003
Revised: 22 June 2004
Accepted: 28 June 2004
Published online: 21 December 2004

Abstract

This paper presents several techniques for determining the complex conductivity of highly electrically conducting polymer films at microwave frequencies. The advantages and disadvantages of these techniques are discussed. Microwave measurements were investigated using resonant cavity, reflection/transmission and impedance surface techniques. The dc conductivity was measured using the four wires technique. Polyaniline (Pani/DEHEPSA) films of 120 m thickness, have conductivity of (5000-6000 S/m) and permittivity of over X and S bands. The high values of the measured conductivity and its weak dependence on frequency at least up to 12 GHz, confirm the metallic character of Pani-films and their efficient use in micro-electronic technology such as microwave integrated circuits (MMIC) and microwave devices.