科研之友
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摘要
Fe3O4@SnO2 core-shell structured microspheres have been designed and synthesized by a simple hydrothermal method. The transmission electron microscopy and scanning electron microscopy characterization results indicate that SnO2 nanoparticles were successfully grown on the surface of Fe3O4 microspheres with different sizes. The X-ray diffractograms show that the nanocomposites are composed of cubic Fe3O4 and tetragonal SnO2. The magnetic hysteresis measurements reveal the ferromagnetic behavior of the nanocomposites at room temperature. Considering that both Fe3O4 and SnO2 are good microwave absorption materials, we have investigated the microwave absorption properties by a vector network analyzer between 2 and 18 GHz at room temperature. The electromagnetic data demonstrate that the as-synthesized Fe3O4@SnO2 microspheres exhibit extraordinary microwave absorption properties, which may result from the proper electromagnetic match and interface polarization between the Fe3O4 cores and SnO2 shells. Moreover, a possible formation mechanism of Fe3O4@SnO2 microspheres based on the hydrothermal method was also proposed.
- 出版日期2015-7
- 单位南京理工大学
