preparation of microwave absorption based copper/polypyrrole

The composites of cu/ polypyrrole (ppy) were synthesized via different methods by in-situ polymerization on the surface of nanoparticles (nps) with core-shell structure. this paper describes a method for polyacrylic acid (paa) coating of nps in aqueous solution. then ppy coathing was performed by template polymerization on nps-paa. the enhancement mechanism is thought due to suitable interaction and better elecromagentic match between these materials. morphology, magnetic and conductivity properties were observed via scanning electron microscopy (sem), the microwave characterization of nanocomposite was evaluted through arch test based on a network analyzer. the ppy nanocomposites possessed the excellent microwave x-band absorbers properties in 8-12 ghz. the best microwave absorption were obtained in 9.5 ghz for ppy, 9 and 12 ghz for cu-ppy with minimum reflection loss (rl) in -17.5 and -18 db at the thickness of 1 mm, respectively. it was also found that nanocomposites with 50% w/w and light weight exhibite good microwave absorbing properties.