Abstract
Nb2CTx/α-MnO2 composites have been constructed by the deposition of α-MnO2 nanowires on the surface of the layered Nb2CTx matrix through an electrostatic self-assembly strategy. The increase of α-MnO2 content can lead to an improvement of permittivity and a shift of the reflection peak towards low frequency at a fixed thickness. Theory analysis speculates that the synergistic effect of lattice defect and electron hopping of Mn4+-O-Mn3+ chains in α-MnO2 nanowires as well as heterogeneous interfaces between Nb2CTx and α-MnO2 are predominant accounts for the enhancement of permittivity. The effective complementary of impedance matching and microwave attenuation can be responsible for the displacement of the reflection peak towards low frequency and a wide-frequency absorption. Accordingly, Nb2CTx/α-MnO2 composites exhibit an optimal reflection loss of -24.7 dB and an absorption bandwidth of 5 GHz at a thin matching thickness of 1.8 mm, which are better than those of most Nb2CTx-based absorbents.
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