Three-Dimensional Magnetic Functionalized Graphene Composite Aerogels for Microwave Absorption: A Review

Graphene-based microwave-absorbing materials (MAMs), especially graphene aerogels (GAs), have attracted tremendous attention because of their excellent characteristics. Three-dimensional (3D) GA materials exhibit a complex porous network structure, which is conducive for enhancing the loss capacity because of multiple reflections and scatterings. Compared to the typical two-dimensional graphene-based absorbing materials, GA materials with a special 3D network and an internal porous structure can solve the phenomenon of graphene sheet layer agglomeration and impedance mismatch, achieving better electromagnetic absorption characteristics. Combining the magnetic materials with GA can realize an ultrawide-band electromagnetic response and improve the microwave absorption (MA) performances of the 3D GA composites. Herein, we summarize the theories of MA and the recent progresses in magnetic GA materials. On this basis, we propose the perspectives and challenges of magnetic GA MAMs and discuss the multifunctional absorbing materials.