Carbon fiber and nanotube based composites with polypyrrole fabric as electromagnetic absorbers

In this paper, we present the fabrication and experimental results of impedance-graded composites containing polyurethane, carbon nanotubes, carbon fibers, and microballoons. Polypyrrole (PPy) fabrics having different surface resistances were used along with these composites, and experiments were carried out to find the effect of the PPy fabric. It was found that both the surface resistance of the fabric and its location in the composite are critical for the reflection property of the electromagnetic absorber.