Fe3O4/carbon composite nanofiber absorber with enhanced microwave absorption performance
Fe3O4/carbon composite nanofiber absorber with enhanced microwave absorption performance
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Fe3O4/碳复合纳米纤维吸收体具有增强的微波吸收性能
DOI：
10.1016/j.mseb.2012.06.005
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发表时间：
2013-01-01
影响因子：
3.6
通讯作者：
Gu, Jialin
中科院分区：
文献类型：
--
作者：
Zhang, Ting;Huang, Daqing;Gu, Jialin
通过静电纺丝聚丙烯腈（PAN）/乙酰丙酮铁（AAI）/二甲基甲酰胺（DMF）溶液，然后稳定化和碳化制备Fe3O4/碳复合纳米纤维。 SEM 和 TEM 观察表明，纤维长且均匀，并且负载有分布均匀的 Fe3O4 纳米粒子，这由 XRD 证明。研究了样品的电学和磁学性能，以显示增强电导率和磁滞性能的效果。最后，利用矢量网络分析仪测量介电常数和磁导率参数，并基于传输线理论计算反射率损耗。结果表明，与纯碳纳米纤维相比，Fe3O4/C复合纳米纤维表现出增强的微波吸收性能：降低反射率损失值；加宽吸收宽度并提高低频（2-5 GHz）吸收性能。吸收性能可以通过改变 MI 含量、碳化温度、复合纤维/石蜡比率和涂层厚度来调节。结果表明，当涂层厚度为5 mm、纤维/石蜡比为5 wt.%时，在2-18 GHz范围内-5 dB反射损耗带宽最大可达12-13 GHz，同时反射损耗最小为-40~-45 dB，并能获得较好的低频段吸收。简要讨论了增强吸收性能的机制。认为这种复合材料有望解决低频吸收弱、带宽吸收窄的问题。 (C) 2012 Elsevier B.V. 保留所有权利。
Fe3O4/carbon composite nanofibers were prepared by electrospinning polyacrylonitrile (PAN)/acetyl acetone iron (AAI)/dimethyl formamide (DMF) solution, followed by stabilization and carbonization. SEM and TEM observations reveal that the fibers are lengthy and uniform, and are loaded with well-distributed Fe3O4 nanoparticles, which are evidenced by XRD. Electrical and magnetic properties of the samples were studied to show the effect of enhancement of electrical conductivity and magnetic hysteresis performance. Finally, the permittivity and permeability parameters were measured by a vector network analyzer, and the reflectivity loss was calculated based on Transmission Line Theory. Results show that Fe3O4/C composite nanofibers exhibit enhanced properties of microwave absorption as compared to those of pure carbon nanofibers by: decreasing reflectivity loss values; widening absorption width and improving performance in low frequency (2-5 GHz) absorption. Absorption properties can be tuned by changing MI content, carbonization temperature, composite fiber/paraffin ratio and coating thickness. It is shown that with coating thickness of 5 mm and fiber/paraffin ratio of 5 wt.%, the bandwidth for reflection loss under -5 dB can reach a maximum of 12-13 GHz in the range of 2-18 GHz, accompanying with a minimum reflection loss of -40 to -45 dB, and preferred low frequency band absorption can also be obtained. The mechanisms for the enhanced absorption performance were briefly discussed. It is supposed that this kind of composite material is promising for resolving the problems of weak absorption in the low frequency range and narrow bandwidth absorption. (C) 2012 Elsevier B.V. All rights reserved.