Microwave Absorption Studies on Superparamagnetic Conducting Nanocomposites as Signal Coating Materials

Abstract

In this paper, preparation and characterization of superparamagnetic nanoparticles and their polymer composites prepared by varing doping level of conducting polymer and their microwave absorption studies at radar system in 8–12 GHz frequency range have been discussed. These composites are conducting polymers have been widely used because of their lower density as well their good environmental stability as in the case of polyaniline (PAN). In the present work, in situ polymerization of aniline was carried out in the presence of 30 mole% Fe₃O₄ nanoparticles to synthesize polyaniline/Fe₃O₄(PAN/Fe₃O₄) composites in epoxy resin matrix. The composites, thus synthesized have been characterized by infrared (IR) spectroscopy and X-ray diffraction. The morphology of these composites was studied by scanning electron microscopy. The measurement of % absorption was carried out in X and K band microwave region.

Keywords:

• Epoxy resin matrix
• Fe₃O₄
• Microwave
• Nanocomposites
• Polyaniline

ACKNOWLEDGMENTS

The authors wish to thank Prof. M. Allahverdiev (Baku State University) for valuable discussions and Professor Morshed (K.N.T. University) for the RCS measurements.