Magnetic ferrite/conductive polyaniline nanocomposite as electromagnetic microwave absorbing materials in the low frequency

Electromagnetic microwave absorbing composite material containing magnetic Mn-Zn ferrite/conductive polyaniline nanocomposites introducing into epoxy resin were fabricated. The conductivity of the Mn-Zn ferrite/polyaniline nanocomposites were investigated by a four point probe method. Complex permeability and reflection loss of the Mn-Zn ferrite/conductive polyaniline/epoxy resin composites have been studied in the frequency of 30 MHz to 1 GHz. It has been found that the conductivity of the nanocomposites can be tailored by controlling the weight percentage of polyaniline. The complex permeability increased with the decreasing weight percent of polyaniline. The composite with the polyaniline weight percent of above 60.89% can effectively broaden the absorbing band with minimum absorption of 5 dB about 500 MHz. It has also been found that the composite with the polyaniline weight percent of 28.12% has a maximum absorption of 23 dB at about 700 MHz for a coating thickness of 2 mm. Therefore, the prepared composites can be potentially applied in electromagnetic absorbing field in the low frequency. © (2013) Trans Tech Publications, Switzerland.