Three-dimensional hierarchical structured Fe3O4/rGO/ZnO composite for effective electromagnetic wave absorption

The three-dimensional Fe3O4/rGO/ZnO composite was successfully fabricated with a two-step method. Particularly, with rGO as the substrate, spindle-shaped ZnO nanorods and magnetic nanoparticles Fe3O4 are uniformly dispersed on the surface of rGO. Various equipments are used to test the structure, morphology and performance of the composite. Compared with single Fe3O4 nanoparticles and Fe3O4/rGO composite, the Fe3O4/rGO/ZnO composite has excellent EMWA performance. The minimum RL of the Fe3O4/rGO/ZnO composite is - 58.7 dB and the effective absorption bandwidth less than - 10 dB is 5.4 GHz (effective absorption bandwidth, RL <= - 10 dB, 12.6-18.0 GHz) with a thickness of 2 mm. It is believed that multi-layered hierarchical Fe3O4/rGO/ZnO composite can be used as an electromagnetic wave absorber and is a prospective material in these technical fields.