RETRACTED: Multifunctional Cellulose/rGO/Fe₃O₄ Composite Aerogels for Electromagnetic Interference Shielding

Abstract

Cellulose/reduced graphene oxide (rGO)/Fe₃O₄ aerogels exhibiting strong electromagnetic wave absorption were prepared by a green, simple, and scalable coprecipitation process. With rGO loading of 8 wt % and Fe₃O₄ content of approx. 15 wt %, the electromagnetic interference shielding effectiveness (EMI SE) of the cellulose/rGO/Fe₃O₄ aerogel with 0.5 mm thickness reached 32.4-40.1 dB at 8.2-12.4 GHz. The EMI shielding performance of cellulose/rGO/Fe₃O₄ aerogels was higher for larger rGO loading (varied between 3 and 8 wt %) and greatly improved on increasing the sample thickness (varied between 0.5 and 2 mm). At 2.0 mm thickness, SE values of 49.4-52.4 dB were reached. Absorption plays a major role in the EMI shielding mechanism of cellulose/rGO/Fe₃O₄ aerogels. The multireflection of microwaves and impedance matching provides the highly efficient EMI shielding caused by the combined effects of the porous structure, rGO sheets, and Fe₃O₄ nanoparticles. The results demonstrate that these lightweight aerogels are suitable for EMI shielding.