Synthesis of rGO/p-Fe3O4@PANI three-phase nanomaterials and electromagnetic wave absorption properties

A novel rGO/p-Fe3O4@PANI three-phase nanomaterial was prepared by coating conductive polyaniline (PANI) on reduced graphene oxide (rGO) and porous Fe3O4 (p-Fe3O4), which can increase the reflection interface of electromagnetic waves and extend the reflection path of electromagnetic waves propagating inside the material, and between them. Three kinds of rGO/p-Fe3O4@PANI samples were prepared. The mass percentage of PANI in the samples was established. The mass ratio of rGO to p-Fe3O4 was changed to ameliorate the impedance matching and attenuation constant. Compared with rGO/p-Fe3O4, rGO/p-Fe3O4@PANI exhibits excellent electromagnetic wave absorption performance. When the mass ratio of rGO to p-Fe3O4 in the 40 wt% three-phase material is 1:5 and the thickness is 2.5 mm, the minimum RL of rGO/p-Fe3O4@PANI is −41.38 dB at 9.75 GHz and the effective absorption bandwidth to electromagnetic wave reaches 3.08 GHz (from 8.40 to 11.48 GHz), indicating that is a potentially attractive candidate for high efficiency electromagnetic wave absorbers. The combination of the conductive polymer, porous magnetic nanoparticles and rGO improves the impedance matching condition to some extent, and effectively increases the attenuation constant of the material.