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采用水热法制备了MFe2O4/MWCNTs(M=Ni、Co、Zn)复合材料。借助X射线衍射仪、场发射扫描电镜和矢量网络分析仪对产物的结构、形貌和电磁参数进行了表征测试。根据传输线理论计算了样品吸波效果图及复合材料在不同厚度下的反射率曲线。结果表明:以纯水为反应溶剂,合成纯净且晶型较好的铁氧体材料;相同条件下,铁氧体不同对包覆情况有较大影响。3种复合样品中CoFe2O4/MWCNTs复介电常数及复磁导率实部较小且虚部较大,表现出较好的吸波性能;当厚度为1.5mm时,低于-10dB的频宽为2.5GHz,最大吸收峰值达-35dB。
The MFe2O4 / MWCNTs (M = Ni, Co, Zn) composites were prepared by hydrothermal method. The structure, morphology and electromagnetic parameters of the product were characterized by X-ray diffraction, field emission scanning electron microscopy and vector network analyzer. According to the theory of transmission line, the wave absorption effect and the reflectivity curve of the composites under different thicknesses were calculated. The results show that pure ferrite with good crystal form is synthesized by using pure water as the reaction solvent. Different ferrite greatly affects the coating under the same conditions. The complex permittivity and complex permeability of CoFe2O4 / MWCNTs in the three kinds of composite samples are smaller and the imaginary part is larger, which shows better absorbing performance. When the thickness is 1.5mm, the bandwidth of less than -10dB 2.5GHz, the maximum absorption peak of -35dB.