Abstract
Coiled carbon nanotubes (CCNTs) were coated by CoFe2O4 (CFO) nanoparticles to form the CCNTs/CFO composites. The phase composition, morphology, electrical and magnetic performances of the composites were characterized by means of modern analytical techniques. The results indicated that the conductivity and magnetic performances of the samples were related to their compositions. The CCNTs/CFO composite with ωCCNT/ωCFO of 0.4 exhibited the best microwave absorption property in the prepared samples, whose minimum reflection loss was about −14dB in the frequency range of 2–18GHz for a layer of 2.5–3.0mm thickness, and the available bandwidth corresponding to RL less than −10dB can reach 4.0GHz. Hence, the obtained composite could be used as a new candidate for selective frequency shielding and lightweight microwave absorbing material.
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