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Abstract
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It is well accepted that the use of nanoparticles in microwave absorbents (MA) can be enhanced
their flexibility and performance. In this work, Y-type barium hexaferrite (Al2Y, Mg2Y, and
Ni2Y), MnO2, and polyaniline nanoparticles were successfully prepared by using methods of
sol-gel auto combustion, chemical co-precipitation and interfacial polymerization,
respectively. The prepared nanoparticles were then inserted within a matrix of polyester resin.
The phase structure, particle size, morphology, and performance of the prepared absorbers were
indicated by X-ray diffractometer (XRD), scanning electron microscope (SEM), and vector
network analyzer (VNA), respectively. The influence of four critical parameters on the
performance of the absorbers was studied by the Taguchi method to achieve an optimal
formulation. For this, parameters investigated include the type of metal in Y-type barium
hexaferrite (Al, Mg, and Ni) and the weight ratios of hexaferrite, MnO2, and polyaniline to the
total weight of the sample. The results displayed that the sample prepared under optimal
conditions has good impedance matching, minimum reflectance loss (RL) of -36 dB at 10.5
GHz (equal to 99.99% effective absorption) with the thickness of 1.9 mm. Therefore, the
optimal nanocomposite based on polyester containing the filler nanoparticles of Al2Y barium
hexaferrite/ MnO2/ polyaniline is an excellent candidate for microwave absorption.
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