碳纳米管/四氧化三铁复合材料的电磁波吸收性能(英文)

Electromagnetic wave absorbing properties of multi-wall carbon nanotube/Fe_3O_4 hybrid materials

采用水热法制备碳纳米管(MWCNT)/四氧化三铁(Fe3O4)复合材料,运用透射电子显微镜、X射线衍射仪、振动样品磁强计及网络矢量分析仪等,对复合材料的微观结构、磁性能及电磁波吸收性能(8.2～12.4 GHz,X波段)进行研究和分析。结果表明,磁性Fe3O4纳米颗粒能够较好地包覆在MWCNTs表面上,并且随着反应混合液中Fe2+和Fe3+浓度的增加,MWCNT/Fe3O4复合材料中的Fe3O4含量增加,MWCNT/Fe3O4复合材料的磁性能增强;当反应混合液中的Fe2+和Fe3+的浓度分别为0.02和0.04 mol/L时,MWCNT/Fe3O4复合材料的电磁波吸收性能最佳,具体表现为吸收峰峰值最低,吸收频宽最宽。

Multi-wall carbon nanotube/Fe3O4 hybrids were prepared by a chemical synthesis-hydrothermal treatment method and their electromagnetic wave absorbing properties were investigated in the frequency range of 8.2-12.4 GHz （X band）. As-prepared hybrids were characterized by transmission electron microscopy, X-ray diffraction and vibrating sample magnetometer. Results indi- cated that the surface of multi-wall carbon nanotubes was attached to magnetic Fe3O4 nanoparticles. The Fe3O4 content increased and the magnetism of the hybrids was enhanced by increasing the concentrations of Fe2＋ and Fe3＋ in solution. The minimum reflection loss （ -18.22 dB, 12.05 GHz） was the lowest and the absorbing bandwidth was the widest when the concentrations of Fe2＋and Fe3＋ were 0.02 and 0.04 tool/L, respectively.