Two-dimensional interface engineering of NiS/MoS2/Ti3C2Tx heterostructures for promoting electromagnetic wave absorption capability

For the purpose of achieving excellent electromagnetic wave absorption performance, composition control and microstructure design of absorbers are crucial. Ti3C2Tx, transition metal carbides with remarkable conductivity and mechanical properties, are considered as common substrates to construct high-performance absorbers. In order to improve the impedance matching and enrich electromagnetic wave attenuation mechanism of single Ti3C2Tx substrate, transition metal sulfides (MoS2, NiS) with outstanding dielectric properties are introduced to fabricate the novel system of NiS/MoS2/Ti3C2Tx. Notably, this system has a unique multilayer-scale structure that spherical NiS particles are decorated on the multilayered Ti3C2Tx substrate and two-dimensional (2D) MoS2 nanosheets stack on the surface like scales. Under the synergistic effects of intense dielectric loss and multiple reflection, NiS/MoS2/Ti3C2Tx hybrid shows the wide effective absorption bandwidth (EAB) of 5.04 GHz at 2.1 mm and the minimum reflection loss (RLmin) of −58.48 dB at 2.4 mm. This work provides an innovative idea for the research of novel MXene-based absorbers.