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

doi:10.11944/j.issn.1000-0518.2017.02.160138

摘要/Abstract

摘要：

采用溶剂热法将磁性Fe₃O₄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Fe₃O₄/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,Fe₃O₄/MWNTs复合粒子具有良好的分散性。 XRD结果显示,附着的Fe₃O₄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)。

关键词: 多壁碳纳米管, 非共价修饰, 聚乙烯亚胺, 电磁参数

Abstract:

A nano-sized microwave absorbing Fe₃O₄/multi-walled carbon nanotubes(MWNTs) hybrids with dielectric and magnetic properties was fabricated by solvothermal method. The morphology and structure of Fe₃O₄/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 Fe₃O₄/MWNTs hybrids can be dispersed homogeneously, and Fe₃O₄ particles exhibit crystal integrity. The electromagnetic parameters of Fe₃O₄/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.

Key words: multi-walled carbon nanotubes, non covalent modification, polyethylenimine, electromagnetic parameter

唐蒙, 刘刚, 邢祎琳, 张爱波. 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[J]. 应用化学, 2017, 34(2): 225-232.

TANG Meng, LIU Gang, XING Yilin, ZHANG Aibo. Microwave Absorption Properties of Fe₃O₄/Polyetherimide Modified Multi-walled Carbon Nanotubes Hybrids Prepared by Solvothermal Method[J]. Chinese Journal of Applied Chemistry, 2017, 34(2): 225-232.

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