Ali Azimi - Department of Chemistry, East Tehran Branch, Islamic Azad University, Tehran, Iran
Seyed Hossien Hosseini - Department of Chemistry, Islamshahr Branch, Islamic Azad University, Tehren, Iran

The composites of Carbonyl iron (CI) /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) and four probe method, respectively. The microwave characterization of nanocomposite was evaluted through arch test based on a network analyzer. 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, 8 GHz for CI-PAA-PPy with minimum reflection loss (RL) in -18.5, -18 and -17.5 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.

CI, Nanocomposites, Microwave, Polyacrylic acid, Polypyrrole