Enhanced microwave absorption material of ternary nanocomposites based on MnFe₂O₄@SiO₂, polyaniline and polyvinylidene fluoride

The core-shell structural MnFe₂O₄@SiO₂ nanocomposite has been successfully fabricated on a large-scale via a simple mechanical stirring method at room temperature. Subsequently, the synthesized MnFe₂O₄@SiO₂ nanoparticles were compounded with polyaniline (PANI) and polyvinylidene fluoride (PVDF) to form ternary nanocomposites. The composites filled with 20 wt% MnFe₂O₄@SiO₂ and 20 wt% PANI in a PVDF matrix show the most excellent wave absorption performance. The minimum reflection loss value can reach -25.73 dB at 12.32 GHz, and the effective frequency bandwidth (RL < -10 dB) ranges from 10.72 to 14.40 GHz. Moreover, the possible microwave absorption mechanism has been also discussed in detail.