One-step solvothermal syntheses and microwave electromagnetic properties of organic magnetic resin/Fe3O4 hybrid nanospheres

Novel hybrid nanospheres composed of organic magnetic resin and Fe3O4 (OMR/Fe3O4) were prepared via an effective solvothermal route. The morphology and structure of the hybrid nanospheres were characterized by Fourier transform infrared spectrophotometer (FTIR), scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and transmission electron microscopy (TEM). These results showed that the as-prepared nanospheres were well-defined in size (200–230 nm) and shape. Base on these results, the formation process was discussed. Magnetization measurement showed that the saturation magnetization and coercive force of the hybrid nanospheres were 62.6 emu g−1 and 163.5 Oe at 300 K, respectively. The microwave absorption properties were measured by a vector network analyzer and the data indicated that the addition of organic magnetic resin has greatly affected the microwave electromagnetic properties of the hybrid nanospheres. The as-prepared hybrids displayed different electromagnetic properties from conventional nano-Fe3O4 particles. The loss in magnetism exhibited two obvious peaks: one appeared at 4.0–5.0 GHz, the other sharp peak appeared around 9.0–12.0 GHz. The former peak was attributed to the natural properties of the Fe3O4 and the latter was owing to the interface effects between OMR and Fe3O4 particles.