Magnetically Aligned Fe3O4 Nanowires-Reduced Graphene Oxide for Gas Barrier, Microwave Absorption, and EMI Shielding,ACS Applied Nano Materials

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Magnetically Aligned Fe3O4 Nanowires-Reduced Graphene Oxide for Gas Barrier, Microwave Absorption, and EMI Shielding
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-08-31 , DOI: 10.1021/acsanm.0c01981
Peipei Fu _{1,

2} , Xianhua Huan ₁ , Jintao Luo ₁ , Shujie Ren _{1,

2} , Xiaolong Jia _{1,

2} , Xiaoping Yang _{1,

2}

Affiliation

Strengthening and functioning effects of Fe₃O₄ nanowires (Fe₃O₄ NWs)-reduced graphene oxide (FeNWs-rGO) hybrid on gas barrier, microwave absorption, and electromagnetic interference (EMI) shielding performance of epoxy (EP) composites were systematically evaluated. FeNWs-rGO hybrid was successfully prepared through dopamine (DA) derived one-pot coprecipitation, associated with the synchronous surface reduction on GO. The in situ growth mechanism of Fe₃O₄ NWs on rGO sheets was properly discussed, in which the DA/Fe³⁺/Fe²⁺ molar ratio and pH value in the reaction solution were found to be the determining factors in obtaining high quality FeNWs-rGO with a large amount and long length of Fe₃O₄ NWs. The magnetism feature of FeNWs-rGO endowed the possibility of controlling their distribution state in EP matrix under the action of external magnetic field. The oxygen transmission and moisture diffusion coefficients of EP composites with magnetically aligned FeNWs-rGO at the intensity of 35 mT were clearly reduced as much as 33.6% and 68.0% compared with those of EP composites with randomly distributed FeNWs-rGO, respectively. More importantly, EP composites with different FeNWs-rGO distributions exhibited obvious anisotropy in microwave absorption and EMI shielding performance. Specifically, when FeNWs-rGO was aligned vertical to the direction of incident wave, the remarkable microwave absorption and EMI shielding capabilities of EP composites were achieved at only 2.0 wt % loading content of FeNWs-rGO, mainly due to strong interfacial polarization effect induced by plentiful heterointerfaces and strengthened multiple reflections inside FeNWs-rGO sheets by maximizing their interaction area with the incident wave.

中文翻译：

磁性排列的Fe ₃ O ₄纳米线还原的氧化石墨烯，用于阻气，微波吸收和EMI屏蔽

系统地研究了Fe ₃ O ₄纳米线（Fe ₃ O ₄ NWs）-还原氧化石墨烯（FeNWs-rGO）杂化材料对环氧复合材料的阻气性，微波吸收和电磁干扰（EMI）屏蔽性能的增强作用。评估。FeNWs-rGO杂种是通过多巴胺（DA）衍生的一锅共沉淀成功制备的，与GO上的同步表面还原相关。适当讨论了rGO片材上Fe ₃ O ₄ NWs的原位生长机理，其中DA / Fe ³⁺ / Fe ²⁺发现反应溶液中的摩尔比和pH值是获得大量且长长度的Fe ₃ O _4的高质量FeNWs-rGO的决定因素西北。FeNWs-rGO的磁性赋予了在外部磁场作用下控制它们在EP矩阵中的分布状态的可能性。磁性排列的FeNWs-rGO的EP复合材料在35 mT强度下的氧气透过率和湿气扩散系数分别明显地比随机分布的FeNWs-rGO的EP复合材料降低了33.6％和68.0％。更重要的是，具有不同FeNWs-rGO分布的EP复合材料在微波吸收和EMI屏蔽性能方面表现出明显的各向异性。具体而言，当FeNWs-rGO垂直于入射波方向排列时，仅当FeNWs-rGO的负载量为2.0 wt％时，才能获得EP复合材料卓越的微波吸收和EMI屏蔽能力，

更新日期：2020-09-25

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