Honeycomb-like SnS2/graphene oxide composites for enhanced microwave absorption

Achieving the broad effective absorption bandwidth (EAB), strong absorption capacity and thin matching thickness are still a huge challenge for the dielectric loss-type microwave absorbers. Here, the honeycomblike SnS2/ graphene oxide (GO) composites are fabricated via a facile chemical bath deposition method to optimize the microwave absorption performances. The 2D SnS2 nanosheets are uniformly and vertically grown on the GO sheets, forming a highly open hierarchical network, which can be beneficial to enhance the multiple scatterings and reflections of incident electromagnetic wave. Meanwhile, the impedance matching (Z) and attenuation constant (alpha) of composites are well-tuned by changing the SnS2 content in the composites. When the GO sheets are just completely coated by SnS2 nanosheets, the SnS2/GO composite exhibits excellent microwave absorption ability with the minimum reflection loss (RLmin) of - 59.2 dB and EAB of 5.4 GHz (12.3-17.7 GHz) at the thickness of only 1.45 mm, which is mainly ascribed to the strong interfacial polarization and good impedance matching. This work provides a significant guidance to achieve excellent absorption performance with broad EAB and strong absorption for dielectric loss-type absorbers. (c) 2022 Published by Elsevier B.V.