Novel synthesis of MoO3/Mo4O11/MoO2 heterogeneous nanobelts for wideband electromagnetic wave absorption

The MoO3/Mo4O11/MoO2 heterogeneous nanobelts was synthesized by hydrothermal method and PH3 reduction. The reduction degree of the samples depend on the calcination temperature which further influence the complex permittivity of the sample. The textural properties and electromagnetic wave absorption performances of MoO3/Mo4O11/MoO2 composites with various components compositions were thoroughly investigated. It is found that the belt-shaped MoO3/Mo4O11/MoO2 composites with length of 200 nm and width of 70 nm exhibit porous surface features. Electromagnetic wave absorption evaluations show that formation of heterogeneous structure could significantly improve the impedance matching and the minimum reflection loss of MoO3/Mo4O11/MoO2 can reach -59.2 dB at 10.8 GHz with the thickness of 4.6 mm. The bandwidth of MoO3/Mo4O11/MoO2 below -10 dB is 9.5 GHz (7.5-17 GHz). The investigations on the absorption mechanism reveal that the high dielectric loss, suitable impedance matching and geometric shape effect contribute to the excellent electromagnetic wave absorption. These results indicate that MoO3/Mo4O11/MoO2 possess potential application prospects in electromagnetic pollution abatement in the future. (C) 2019 Elsevier B.V. All rights reserved.