Magnetic Ferrite/Conductive Polyaniline Nanocomposite as Electromagnetic Microwave Absorbing Materials in the Low Frequency

Abstract

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.

A review of graphene-based broad bandwidth microwave absorbing textile-based composites in the low-frequency range

“…Therefore, the micro-nano magnetic loss absorbers are suitable for low-frequency MWAM. 85,87,89 Ma and co-workers 90 synthesized reduced Graphene oxide/ZnFe 2 O 4 /Ni (rGO/ ZnFe 2 O 4 /Ni) spherical nano-hybrid composites by hydrothermal strategy. When the content of rGO/ZnFe 2 O 4 /Ni nano-hybrid increased to 40 wt%, the minimal RLV was À22.57 dB at 4.21 GHz with a thickness of 2.5 mm.…”

“…Hence, improving the EMW loss capacity of MWAM is imperative, especially the absorbing capacity. 87 However, higher dielectric loss is not conducive to impedance match in the low-frequency range. Therefore, the robust absorption in the low-frequency range mainly depends on the ability of magnetic loss.…”

Development of a technology for absorbing screening of command posts with electronic equipment

“…Production of an electromagnetic polyaniline composite with an absorbing capacity in a microwave frequency band containing magnetic nanocomposites was considered in [7]. The complex coefficient of reflection and transmission of electromagnetic waves in a frequency band of 30 MHz to 1 GHz in a composite medium was studied.…”

“…An overview of publications [1][2][3][4][5][6][7][8][9][10][11][12] revealed two main unresolved parts of the problem of absorbing screening the premises equipped with electronic hardware from interference of electromagnetic fields. First of all, there is a need for a scientific substantiation of expediency of synthesis of dispersible ferrite broadband fillers with electrical conductivity exceeding that of known fillers by several orders of magnitude.…”