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

Abstract

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.