Construction of Co/C@MoS2 core-shell nanocubes with enhanced electromagnetic-wave absorption performance

This investigation is aimed at obtaining superior electromagnetic wave (EMW) absorbers and we successfully prepared the core-shell-structured Co/C@MoS2 nanocubes comprising Co/C nanocubes tightly coated with uniform MoS2 nanosheets for the first time. The MoS2 nanoshells of the Co/C@MoS2 enabled the optimization of the impedance matching and generation of dipolar polarizations. The Co/C cores also increased the conductivity of the resultant Co/C@MoS2 composites, thus promoting the attenuation ability of the EMW. The synergetic contributions of improved impedance matching and multiple loss mechanisms led to excellent EMW absorption of the Co/C@MoS2. In particular, the reflection loss of the Co/C@MoS2 reached - 52.76 dB at 8.88 GHz for a 2.5-mm-thick absorber while the effective attenuation bandwidth under - 10 dB was 3.84 GHz for a 1.5-mm-thick absorber. Accordingly, the prepared Co/C@MoS2 with enhanced absorption performance is a promising absorber and we also proposed a facile design and synthesis strategy for new EMW absorbers in this paper. (c) 2022 Elsevier B.V. All rights reserved.