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

Abstract

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 honeycomb-like SnS 2 / graphene oxide (GO) composites are fabricated via a facile chemical bath deposition method to optimize the microwave absorption performances. The 2D SnS 2 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 (α) of composites are well-tuned by changing the SnS 2 content in the composites. When the GO sheets are just completely coated by SnS 2 nanosheets, the SnS 2 /GO composite exhibits excellent microwave absorption ability with the minimum reflection loss (RL min ) 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. • Honeycomb-like SnS 2 /GO composites are fabricated via chemical bath deposition. • Abundant SnS 2 -GO interfaces are constructed, resulting in strong polarization. • Excellent EMW absorption performances are obtained by adjusting SnS 2 content. • The RL min and EAB of SG2 reach − 59.2 dB and 5.4 GHz at 1.45 mm, respectively .