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.