Fe3O4@SiO2 nanoparticles wrapped with polypyrrole (PPy) aerogel: A highly performance material as excellent electromagnetic absorber.

Massive efforts have been focused on effective electromagnetic absorbing materials, which have promising applications in suppressing or eliminating the electromagnetic radiation. In this study, Fe 3 O 4 @SiO 2 @PPy composites were prepared via a facile one-pot polyreaction. The results demonstrate that the composites loaded with 30 wt% possess an excellent electromagnetic absorbing property. Specifically, the minimum reflection loss value is −56.90 dB at 10.41 GHz at an absorber thickness of 3.7 mm. The broadest effective frequency bandwidth (reflection loss less than −10 dB) is 6.38 GHz at an absorber thickness of 3 mm. The outstanding performance implies that the Fe 3 O 4 @SiO 2 @PPy composites have a huge potential for application as advanced electromagnetic absorber with the advantages of strong absorption, wide bandwidth and low density. [ABSTRACT FROM AUTHOR]