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Title
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Targeted design of polyaniline-graphene oxide, barium-strontium titanate, hard-soft ferrite, and polyester multi-phase nanocomposite for highly efficient microwave absorption
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Abstract
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The current paper focuses on synthesizing a high-efficiency microwave absorber via incorporating the nanofillers
of graphene oxide-polyaniline (GO-PANI), barium-strontium titanate (BST), and soft-hard ferrite within the
polyester matrix. The nanocomposite magnets of (Ba0.5Sr0.5Fe12O19)1-x hard/(CoFe2O4)x soft (x = 0.2, 0.5, and
0.8) were prepared using sol-gel auto-combustion method. The GO-PANI and BST were successfully synthesized
by in situ polymerization and improved polymerization, respectively. The phase structure, chemical structure,
morphology, and microwave absorption properties of the synthesized nanocomposites were characterized by Xray
diffractometer (XRD), Fourier-transform infrared spectroscopy (FT-IR), and scanning electron microscope
(SEM), vector network analyzer (VNA) techniques, respectively. The results showed that the synergistic effects of
the combination of dielectric (BST), conductive (GO-PANI), and magnetic materials (hard-soft ferrites) provided
the reflection loss values of less than 20 dB (>99% absorption) in the X-band region. The minimum reflection
loss of 35 dB (>99.99% absorption) was obtained by the optimal formulation including (Ba0.5Sr0.5Fe12O19)0.2
(CoFe2O4)0.8, and the weight ratio of 1: 2 for both BST/soft-hard ferrite and hard-soft ferrite + BST/GO-PANI
with the thickness of 1 mm. According to the results, the thickness factor plays a key role in improving the
impedance matching. Consequently, the proposed nanocomposite can be employed as a novel kind of microwave
absorbers with good impendence matching and high absorption.
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