溶剂热法制备四氧化三铁/聚乙烯亚胺修饰的多壁碳纳米管复合粒子及其吸波性能

Microwave Absorption Properties of Fe_3O_4/Polyetherimide Modified Multi-walled Carbon Nanotubes Hybrids Prepared by Solvothermal Method

采用溶剂热法将磁性Fe_3O_4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Fe_3O_4/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Fe_3O_4/MWNTs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,Fe_3O_4/MWNTs复合粒子具有良好的分散性。XRD结果显示,附着的Fe_3O_4粒子具有完整的晶型结构。吸波性能结果表明,PEI修饰的Fe_3O_4/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 d B,反射损耗大于-10 d B的频段为1.42 GHz(5.40~6.82 GHz)。

A nano-sized microwave absorbing Fe304/multi-walled carbon nanotubes （MWNTs） hybrids with dielectric and magnetic properties was fabricated by solvothermal method. The morphology and structure of Fe304/MWNTs hybrids were characterized by X-ray diffraction （XRD）, Fourier transform infrared spectrometer（ FTIR）, thermal gravimetric analysis （TGA） and transmission electron-microscopy （ TEM ）. The results show that Fe3 O4/MWNTs hybrids can be dispersed homogeneously, and Fe304 particles exhibit crystal integrity. The electromagnetic parameters of Fe304/MWNTs hybrids were measured by vector network instrument. The microwave absorbing properties shows that the microwave absorption frequency of Fe3O4/MWNTs hybrids shifts to low frequency with the increase of thickness. The maximum reflection loss （RL） of Fe3O4/MWNTs hybrids is -42.9 dB at 6. 16 GHz and 3.2 nm thickness, and the frequency bandwidth is 1.42 GHz for - 10 dB RL over.