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首页> 外文期刊>Polymers for advanced technologies >Combined effect of graphene oxide and MWCNTs on microwave absorbing performance of epoxy composites
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Combined effect of graphene oxide and MWCNTs on microwave absorbing performance of epoxy composites

机译：氧化石墨烯和多壁碳纳米管对环氧复合材料微波吸收性能的联合影响

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Currently, carbon nanotube (CNT) -based composites have been considered as microwave absorbers because of the fascinating properties of CNTs. In this work, multi-walled CNTs (MWCNTs) and graphene oxide (GO) -based epoxy composites (i.e. MWCNT/EPr and GO-MWCNT/EPr), with sample thickness of 2mm, were prepared to study microwave absorbing properties in the frequency band of 8-18GHz. Uniform dispersion of MWCNTs in the organic solvent and polymer matrix was achieved by preparation of GO. The test for electromagnetic parameters, i.e. complex permittivity and the permeability of the samples, was carried out with vector network analyzer (VNA) using reflection-transmission waveguides. Results showed that GO-MWCNT/EPr composites have better absorption capability than MWCNT/EPr composites. The improved reflection loss for the composites with 0.4wt% and 0.6wt% of GO (out of total filler loading 6wt%) were -14.32dB and -14.29dB, respectively. The improvement in reflection loss and absorption bandwidth for GO-MWCNTs composites suggested that MA features are synergistically effected by GO and MWCNTs. Further skin depth and shielding effectiveness terms are studied to observe overall mechanism of electromagnetic (EM) shielding which showed that multiple reflections also play a role in EM shielding. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：当前，由于碳纳米管的迷人特性，基于碳纳米管（CNT）的复合材料被认为是微波吸收剂。在这项工作中，制备了厚度为2mm的多壁CNT（MWCNT）和氧化石墨烯（GO）基环氧复合材料（即MWCNT / EPr和GO-MWCNT / EPr），以研究在一定频率下的微波吸收特性。 8-18GHz频段。通过制备GO可以实现MWCNT在有机溶剂和聚合物基体中的均匀分散。电磁参数，即复介电常数和样品的磁导率，是通过使用反射透射波导的矢量网络分析仪（VNA）进行的。结果表明，GO-MWCNT / EPr复合材料比MWCNT / EPr复合材料具有更好的吸收能力。 GO含量为0.4wt％和0.6wt％的复合材料（在6wt％的总填料中）的反射损耗改善为-14.32dB和-14.29dB。 GO-MWCNTs复合材料的反射损耗和吸收带宽的改善表明，GO和MWCNTs共同影响了MA特性。研究了进一步的趋肤深度和屏蔽效果术语，以观察电磁（EM）屏蔽的整体机理，该机理表明多次反射在EM屏蔽中也起作用。版权所有（c）2015 John Wiley＆Sons，Ltd.

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