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

• 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
• ISSN: 0379-6779; 1879-3290
• DOI: 10.1016/j.synthmet.2020.116369

•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 (