Developing a high-performance electromagnetic microwave absorber using BaTiO3/CoS2/CNTs triphase hybrid.

Toward the development of a novel electromagnetic microwave absorber, a CNTs-modified BaTiO 3 /CoS 2 ternary nanostructure was synthesized by the hydrothermal method. BaTiO 3 /CoS 2 nanocomposite was connected by CNTs, forming conductive networks for electron migration and hopping. An array of techniques were used to characterize the products, including XRD, BET, FTIR, Raman, XPS, FESEM, HR-TEM, and VNA. For the BaTiO 3 /CoS 2 /CNT nanocomposite, a Minimum reflection loss (RL min) of −72.2 dB (99.999 95% wave absorption) was recorded for thicknesses of 4 mm at 4.44 GHz. Furthermore, the effective absorption bandwidth (EAB) of 6.9 GHz was obtained with a coating thickness of 1.5 mm. Moreover, the RL values for the pure BaTiO 3 phase and BaTiO 3 /CoS 2 binary nanocomposite, respectively, reach −20.3 dB and −42.5 dB. The specific RL values (SRL1t and SRL1), impedance matching (|Δ|) as well as EAB values of the prepared nanocomposite were much better than those of the previous BaTiO 3 -based absorbers. To explain the microwave absorbing properties, the conductive loss and magnetic loss mechanisms were thoroughly investigated. [ABSTRACT FROM AUTHOR]