Search

• Plate-like BaFe 12 O 19 @ZnFe 2 O 4 /MWCNTs nanocomposites were successfully fabricated via a facile method. • MWCNTs formed conductive networks in the ternary hybrids. • The exchange coupling between BaFe 12 O 19 and ZnFe 2 O 4 could widen the absorption band. • RL min reaches to −42.3 dB at 8.2 GHz and −10 dB bandwidth reaches 3.6 GHz. In order to reduce the radiation and interference of electromagnetic waves, rational assembly of dielectric materials and magnetic materials is becoming a promising strategy to produce highly efficient microwave absorbers. Herein, a novel kind of ternary nanocomposites, multi-wall carbon nanotubes decorated plate-like BaFe 12 O 19 @ZnFe 2 O 4 (BaFe 12 O 19 @ZnFe 2 O 4 /MWCNTs), was fabricated via a two-step method. Plate-like BaFe 12 O 19 was prepared firstly as a template for the growth of ZnFe 2 O 4 layer, forming a core-shell structure. MWCNTs dispersed between BaFe 12 O 19 @ZnFe 2 O 4 particles and ZnFe 2 O 4 microspheres, forming three-dimensional (3D) conductive networks. The careful design of the structure and the combination of the dielectric material with the hard-soft magnetic material caused excellent impedance matching and multiple loss mechanisms, which endow the ternary hybrids with remarkable microwave absorption performance. The minimum reflection loss reaches −42.3 dB at 8.2 GHz with a layer thickness of 2.5 mm, and the effective bandwidth is 3.6 GHz (from 12.5 GHz to 16.1 GHz) with a layer thickness of 1.5 mm. [ABSTRACT FROM AUTHOR]