Abstract
Fe3O4/C micro-flowers with a three-dimensional (3D) porous morphology (3D-Fe3O4/C MFs, ∼5–7 μm) were prepared by a simple hydrothermal method, with a subsequent calcination step. The 3D-Fe3O4/C MFs consisted of radially assembled 2D Fe3O4/C nanoflakes (NFs, thickness ∼40 nm). When the electromagnetic wave absorption (EMWA) performances of paraffin composites with 10, 30, and 40 wt% 3D-Fe3O4/C MF loading and Fe3O4-based materials were compared, the paraffin composite with 20 wt% loading exhibited a strong reflection loss (RL, −37.6 dB) and a broad effective absorption bandwidth (EAB, RL < −10 dB, 5.2–9.36 GHz). The excellent EMWA performance was due to the synergistic effects of multiple components (carbon and Fe3O4), combined with a hierarchically porous and 3D structure. The lightweight and broad EAB and the strong and tunable EMWA performances of 3D-Fe3O4/C MFs make them attractive for the development of high-performance EMW absorbers.
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