Investigations on structure-dependent microwave absorption performance of nano-Fe3O4 coated carbon-based absorbers
Investigations on structure-dependent microwave absorption performance of nano-Fe3O4 coated carbon-based absorbers
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纳米Fe3O4涂层碳基吸波体结构相关微波吸收性能研究
DOI：
10.1016/j.carbon.2018.12.036
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发表时间：
2019-04-01
期刊：
影响因子：
10.9
通讯作者：
Fu, Shaoyun
中科院分区：
文献类型：
--
作者：
Li, Na;Huan, Guiwen;Fu, Shaoyun
据报道，磁性涂层结构对纳米Fe3O4包覆碳纳米管的微波吸收性能(MAP)有很大影响。然而，哪种涂层结构更有利于Fe3O4包覆的还原石墨烯氧化物(RGO)增强MAP，目前还不确定。本工作首先制备了纳米Fe3O4致密包覆RGO(FCG)和Fe3O4松包RGO(Flg)，并对它们的MAP进行了研究。结果表明，FCG具有较强的涂层结构依赖效应，其MAP明显好于FCG。然后，制备了纳米Fe3O4致密包覆碳纳米管和氧化铁的混合物(FCCG)。结果表明，MAP可低至-42.9dB，而Fe3O4纳米粒子的高覆盖密度是实现这一优异性能的重要因素。此外，为了研究CNT和rGO之间的协同效应，合成并优化了不同质量比的FCCG，使其介电损耗和磁损耗之间的有效互补最大化，从而获得较高的MAP。结果表明，当RGO含量为50wt%时，FCCG的MAP最好，这主要归因于随后的介电弛豫过程的促进和多界面增加引起的磁损耗。(C)2018爱思唯尔有限公司。保留所有权利。
It is reported the magnetic coating structure has a significant influence on their microwave absorption performance (MAP) for nano-Fe3O4-coated CNT. However, it is still uncertain which type of coating structure is favorable for Fe3O4-coated reduced graphene oxides (rGO) to enhance the MAP. In this work, nano-Fe3O4 compact-coated rGO (FCG) and Fe3O4 loose-coated rGO (FLG) are prepared firstly and their MAP have been investigated. A strong coating structure dependent effect is found and the FCG is proved to own much better MAP than FLG. Afterwards, the nano-Fe3O4 compact-coated CNT and rGO mixture (FCCG) are fabricated. It is shown that the MAP could reach as low as -42.9 dB, and the high coverage density of Fe3O4 nanoparticles plays important role on achieving this excellent property. Furthermore, in order to investigate the synergistic effects between CNT and rGO, FCCG with different mass ratios of CNT to rGO have been synthesized and optimized to maximize the effective complementarities between the dielectric loss and the magnetic loss to obtain high MAP. Results show the FCCG with 50 wt% rGO content achieves the best MAP, which can be attributed to the promoted consequent dielectric relaxation process and the magnetic loss induced by the increased multiple interface. (C) 2018 Elsevier Ltd. All rights reserved.