采用溶剂热法将磁性Fe3 O4粒子附着在聚乙烯亚胺(PEI)修饰的多壁碳纳米管(MWNTs)表面,制备了兼具介电损耗和磁损耗的复合吸波微粒Fe3O4/MWNTs.利用X射线衍射仪(XRD)、傅里叶红外光谱仪(FTIR)、热重分析仪(TGA)、透射电子显微镜(TEM)及矢量网络分析仪等分析了Fe3OJMWNTs复合粒子的结构、形貌和吸波性能.TEM结果表明,由于PEI的修饰作用,Fe3OJMWNTs复合粒子具有良好的分散性.XRD结果显示,附着的Fe3 O4粒子具有完整的晶型结构.吸波性能结果表明,PEI修饰的Fe3O4/MWNTs复合微粒拥有非常优异的吸波性能,随着厚度的增加,复合微粒的吸收峰向低频处移动.在厚度为3.2 mm,频率为6.16 GHz时,出现了最大反射损耗-42.9 dB,反射损耗大于-10 dB的频段为1.42 GHz (5.40 ～6.82 GHz).
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