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In situ synthesis and electromagnetic wave absorbing properties of sandwich microstructured graphene/La-doped barium ferrite nanocomposite

机译:夹层微结构石墨烯/掺镧钡铁氧体纳米复合材料的原位合成及其电磁波吸收性能

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The development of high reflection loss and broad frequency bandwidth for electromagnetic wave absorbing materials has been pursued for a long time. Constructing a rational microstructure of an absorber will have significant impact on reflection loss increase and frequency bandwidth broadening. Herein, we successfully prepare a sandwich microstructured graphene/BaFe12O19 nanocomposite by an in situ auto-combustion method. Compared to pure BaFe12O19, the sandwich microstructured graphene/BaFe12O19 showed better electromagnetic wave absorbing properties. Furthermore, the sandwich microstructured graphene/Ba0.8La0.2Fe12O19 nanocomposite was prepared with La-doped BaFe12O19 using the same method. The obtained graphene/Ba0.8La0.2Fe12O19 nanocomposite exhibited a saturation magnetization of 26.55 emu g?1 at room temperature and exhibited excellent magnetic performance. The maximum reflection loss of the sandwich microstructured graphene/Ba0.8La0.2Fe12O19 nanocomposite with a thickness of 1 mm could reach up to ?40.26 dB, and a frequency bandwidth value below ?10 dB was observed up to 3.87 GHz within the frequency range of 2–18 GHz.
机译:电磁波吸收材料的高反射损耗和宽频带的发展已被追求了很长时间。构建合理的吸收体微观结构将对反射损耗的增加和频率带宽的扩展产生重大影响。在这里,我们成功地通过原位制备了夹层微结构石墨烯/ BaFe 12 O 19 纳米复合材料自动燃烧方法。与纯BaFe 12 O 19 相比,夹心微结构石墨烯/ BaFe 12 < / sub> O 19 表现出更好的电磁波吸收性能。此外,夹层微结构石墨烯/Ba0.8La0.2Fe12 12 O 制备> O 19 纳米复合材料> 19 使用相同的方法。得到的石墨烯/Ba0.8La0.2Fe12 O 19 纳米复合材料在室温下的饱和磁化强度为26.55 emu g ?1 ,并且具有出色的磁性性能。夹层微结构石墨烯/Ba0.8La0.2Fe12的最大反射损耗厚度为1 mm的 O 19 纳米复合材料可达40.26 dB,观察到的带宽小于10 dB。在2-18 GHz的频率范围内高达3.87 GHz。

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