The present work focused on the synthesis and characterization of a magnetic M-type hexaferrite (CuFe 10 Al 2 O 19 ) and its coating on the acid-modified multiwall carbon nanotube (MWCNT) through an in situ technique. Thermoplastic polyurethane (TPU)/CuFe 10 Al 2 O 19 /MWCNT nanocomposites, for the fabrication of microwave test plates, were prepared via the solution mixing process. The nanocomposites exhibited a remarkable and improved microwave absorption properties, compared to the pristine MWCNT and CuFe 10 Al 2 O 19 . The enhanced microwave absorption can be explained by the dielectric loss due to MWCNT, and the magnetic loss initiated by CuFe 10 Al 2 O 19 . We have also measured the relative complex permittivity and permeability, which assists to elucidate the improved microwave absorption property of the composites. The nanocomposite also showed a better specific capacitance of 269 F/g, and good electrochemical impedance properties than those of the pristine MWCNT and CuFe 10 Al 2 O 19 . This work can be extended effectively in the future for both supercapacitor and microwave-absorbing applications.
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Bhattacharya et al. (2013) studied this question.
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