Synthesis and microwave absorption properties of polyaniline/carbonyl iron composites in 1–18GHz

The objective of this study is to develop microwave absorbers using both dielectric and magnetic lossymaterials. Polyaniline (PANi) is used as dielectric lossy materials and carbonyl iron powder (CIP) is used asmagnetic lossy materials. The samples with the weight ratio (PANi:CIP) of 3:1 and 1:1 were prepared via in-situpolymerization of aniline in an aqueous solution containing carbonyl iron powder and ammonium persulfate asoxidant. The structure, morphology and properties of the composites are characterized with FTIR, XRD, scanningelectron microscope (SEM) and net-work anlyzer. The reflection loss (RL) of the composites have been measuredin the frequency range of 1-18GHz employing vector network analyzer. The results showed the reflection lossPANi/CI composites were intermediate pure polyaniline and pure carbonyl iron. The electromagnetic propertiesof the composite heavily depended on the particle loadings. The minimum reflectionpeaks of the coatings shift towards the lower frequency region with the increase of CIP content.

کلیدواژه ها:

Wave absorption ، Polyanilin ، Carbonyl iron ، Reflection Loss