The influence of MWCNTs on microwave absorption properties of Co/C and Ba-Hexaferrite hybrid nanocomposites

•single layer multi-component absorbers with magnetodielectric fillers were synthesized.•Co/C MOF/doped Barium hexaferrite/MWCNTs composites were successfully prepared.•The sample with 55 wt% loading exhibits optimal RL characteristics.•RLmin of the sample is −26 dB with a broad effective bandwidth...

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Bibliographic Details
Published in:Synthetic metals 2020-05, Vol.263, p.1-7, Article 116369
Main Authors: Peibo, Li, Yize, Sun, Akinay, Yuksel
Format: Article
Language:English
Subjects:
Ba-Hexaferrite
Dielectric loss
Electron microscopes
Magnetic permeability
Metal-Organic frameworks
Microwave absorbers
Microwave absorption
MWCNTs
Nanocomposites
Performance evaluation
Permeability
Permittivity
Superhigh frequencies
Synthesis
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Summary:•single layer multi-component absorbers with magnetodielectric fillers were synthesized.•Co/C MOF/doped Barium hexaferrite/MWCNTs composites were successfully prepared.•The sample with 55 wt% loading exhibits optimal RL characteristics.•RLmin of the sample is −26 dB with a broad effective bandwidth of 4.2 GHz at 2.5 mm.•Multiple attenuation of this customized heterogeneous structures enhanced microwave absorption performance. The microwave absorber composites as the combinations of MWCNTs, Ba-hexaferrite and Co/C particles were prepared. For Co/C synthesis, firstly, the Co-based MOF (ZIF-67) was synthesized through the solvothermal method and secondly, the ZIF-67calcined at 500 °C to obtain Co/C particles. In addition, the BaCoTiFe10O19 powder was synthesized via the hydrothermal method. The structural and morphological analysis were carried out by X-ray diffractometer (XRD), transmission electron microscope (TEM) and scanning electron microscope (SEM). The permeability and permittivity values of composites were investigated in the range of X band frequency (8.2–12.4 GHz). The electromagnetic (EM) wave absorption performance of composites was evaluated by using values of the permeability and permittivity values. It was demonstrated that the EM absorption performance of composites was enhanced by the loading MWCNTs. The combination of MWCNT with Ba-M and Co/C increased the magnetic and dielectric losses due to the enhance in both polarization and surface area. The minimum reflection loss (RL) of CBM.70.29.1 reached -34 dB with effective bandwidth (
ISSN:0379-6779
1879-3290
DOI:10.1016/j.synthmet.2020.116369