Abstract
Microwave absorption properties were systematically studied for synthesised barium hexaferrite (BaFe12O19) nanoparticles and spiraled multiwalled carbon nanotubes (MWCNTs) hybrid. BaFe12O19 nanoparticles were synthesised by a high energy ball milling (HEBM) followed by sintering at 1400 °C and structural, electromagnetic and microwave characteristics have been scrutinized thoroughly. The sintered powders were then used as a catalyst to synthesise spiraled MWCNTs/BaFe12O19 hybrid via the chemical vapour deposition (CVD) process. The materials were then incorporated into epoxy resin to fabricate single-layer composite structures with a thickness of 2 mm. The composite of BaFe12O19 nanoparticles showed a minimum reflection loss is − 3.58 dB and no has an absorption bandwidth while the spiraled MWCNTs/BaFe12O19 hybrid showed the highest microwave absorption of more than 99.9%, with a minimum reflection loss of − 43.99 dB and an absorption bandwidth of 2.56 GHz. This indicates that spiraled MWCNTs/BaFe12O19 hybrid is a potential microwave absorber for microwave applications in X and Ku bands.
Highlights
Microwave is an electromagnetic (EM) radiation with a frequency range between 300 MHz to 3 THz
The X-Ray Diffraction (XRD) patterns confirmed the formation of single-phase BaFe12O19 and the existence of peak carbon of spiraled multiwalled carbon nanotubes (MWCNTs)/ BaFe12O19 hybrid
Dielectric losses are the main contributors to the microwave absorption properties of the spiraled MWCNTs/BaFe12O19 hybrid with a filler content of 10 wt%
Summary
Microwave is an electromagnetic (EM) radiation with a frequency range between 300 MHz to 3 THz. Heat loss due to the interaction of the EM field with the electrical and/or magnetic dipole causes absorption loss in the material. M-Type barium hexaferrite (BaFe12O19) forms SRS*R* crystal structure, in which R and S indicate three and two oxygen-ion layer blocks. These ferrites are effective microwave materials due to their high magnetocrystalline anisotropy, low cost, high Curie temperature, and competent saturation magnetization p roperties[3]. The spiraled MWCNTs/BaFe12O19 hybrid will be prepared to investigate its performance on the EM wave absorption with a wideband frequency capability. The spiraled MWCNTs/BaFe12O19 hybrid may be used as a potential microwave absorber as well as a protective coating
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