Microwave absorption and permittivity of polyaniline thin films using overlay technique

This paper reports the use of nonresonating microstripline for investigation of polyaniline thin film using overlay technique. Microwave absorption, DC conductivity, microwave conductivity, shielding effectiveness and microwave permittivity and dielectric loss of the conducting PANI films are reported. DC conductivity was between 0.15×10⁻³ and 3.13×10⁻³ S/cm. Microwave conductivity was between 0.1 and 10 S/cm. The PANI films coated on alumina gave shielding effectiveness values of −1 to −8 db. The ε′ was between 40 and 350. Measurements have been carried out over the frequency range 8.2-18 GHz. The effect of thickness of the overlay is also reported.