Enhanced electromagnetic wave absorption through MoO3 surface electromagnetic composites

MoO3 is a typical transition metal oxide, which is widely used in many fields owing to its unique physicochemical properties. Current studies have shown that Carbon (C) or metallic compounds (M) can enhance its absorption properties. In this study, we employed interface engineering methods and utilized a core-shell encapsulation structure to investigate the superior electromagnetic wave absorption performance of molybdenum oxide double-layer composite materials under different coating sequences. o-MoO3/M/C (external PPy internal metal ions, ratio 1:1) and o-MoO3/C/M (external metal ions internal PPy, ratio 1:1) were synthesized by hydrothermal synthesis and pyrolysis. By comparing the absorption results of the two samples, o-MoO3/M/C is significantly better than o-MoO3/C/M. The widest absorption bandwidth is 5.28 GHz when the material (o-MoO3/M/C) thickness is 6.6 mm, with a minimum reflection loss (RLmin) of - 20.42 dB when the material thickness is 5.7 mm.