Preparation of rGO/MoSe2 nanocomposites for enhanced microwave absorption of whole X and Ku bands

Abstract

rGO–MoSe₂ nanocomposites were prepared via a one-pot hydrothermal method in which MoSe₂ microspheres (MS) were decorated on rGO sheets. Three nanocomposites named F1, F2, and F3 were prepared using different weight ratios of MoSe₂ MS to rGO: (3 : 1), (4 : 1), and (5 : 1), respectively. FESEM images showed a flower-like porous morphology of the MoSe₂ microspheres. All the rGO–MoSe₂ nanocomposites exhibited remarkable microwave absorption properties as demonstrated by strong reflection loss (−58 dB to −99 dB) and an ultrabroad effective absorption bandwidth (equivalent to 90% attenuation), which covers whole X and Ku frequency bands at matching thicknesses of 2.8–3.2 mm. The minimum reflection loss reached −98, −99, and −75 dB for F1, F2 and F3, respectively. The excellent absorption properties of the rGO–MoSe₂ nanocomposites is related to the unique morphology and micro size of MoSe₂ in which incident waves are attenuated by multiple reflections and scattering.