Porous three-dimensional network of MoSe2 microspheres bridged by ZnO nanoparticles with excellent absorption bandwidth toward electromagnetic waves

Abstract

The design of a three-dimensional (3D) porous structure and rough surface morphology has proven to be a practical strategy for preparing highly efficient electromagnetic wave (EW) absorbents. In this study, ZnO nanoparticles were synthesized via a hydrothermal method, and MoSe2 nanoflowers were introduced and adhered to each other to form ZnSe@MoSe2 microspheres. The microspheres exhibit a 3D porous structure and rough surface morphology, allowing the EWs to effectively penetrate the material and forcing the EWs to undergo multiple reflections and scattering. Additionally, the excellent EW-absorbing performance of the composite results from the synergistic effect of multiple components. The maximum effective absorption bandwidth was 8.6 GHz, which was observed at a thickness of 2.2 mm and covered the entire Ku-band. The minimum reflection loss was − 44 dB, which was obtained at a thickness of 1.9 mm. This study provides significant insights into the design and preparation of highly efficient EW absorbents.