Abstract
The pompon-shaped Nb2O5/carbon nanotubes composite microspheres (NCM) were successfully synthesized via a spraying technique as electromagnetic wave (EMW) absorption materials. The comprehensive investigation process involved the microstructure, phase composition, EMW absorption property, and corresponding mechanisms of the as-fabricated NCM. The combination of CNTs and Nb2O5 not only provides multiple attenuation mechanisms but also promotes impedance matching. Furthermore, substantial newly-formed heterogeneous interfaces in NCM enhance the relaxation polarization process. Additionally, the distinctive pompon-shaped morphology of NCM enhances multiple reflection and scattering of the EMW, thereby facilitating the extension of transmission paths for charge. NCM-3 demonstrated significantly superior EMW absorption performance, with an effective absorption bandwidth (EAB) of 5.28 GHz and a minimum reflection loss (RLmin) of −30.52 dB at a mere thickness of 1.97 mm. This work could provide critical guidance for the exploration of new binary materials for EMW absorption.
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