Facile preparation and microwave absorption properties of porous Co/CoO microrods
Facile preparation and microwave absorption properties of porous Co/CoO microrods
复制标题
多孔Co/CoO微棒的简便制备及其微波吸收性能
DOI：
10.1016/j.jallcom.2017.06.011
复制
发表时间：
2017-10-15
影响因子：
6.2
通讯作者：
Peng, Dong-Liang
中科院分区：
文献类型：
--
作者：
Liu, Xiang;Qiu, Yulong;Peng, Dong-Liang
电磁波吸收材料具有低密度和多孔性的特点，引起了人们的广泛关注。本文采用表面法合成了多孔Co/CoO微米棒。由于Co/CoO微米棒的特殊结构，使其具有良好的上级微波吸收性能。铁磁金属Co组元的高饱和磁化强度使复合材料具有较大的相对复磁导率。材料的多孔结构改善了阻抗匹配，增强了材料内的多次反射。当功能性填料含量为70wt%时，由于逾渗效应，复合材料的相对复介电常数和相对复磁导率显著增加。当吸收体厚度为1.20 mm时，有效带宽为10.83 ~ 17.84 GHz，几乎覆盖Ku波段（12-18 GHz）。在8.08 GHz频率下，厚度仅为1.76 mm，RL值最小（-47.96 dB），表明该材料可以作为一种厚度较小的低频吸波材料。(C)2017爱思唯尔B. V.保留所有权利。
Electromagnetic wave absorption materials with the features of being low density and porosity have attracted a great deal of attentions. In this manuscript, porous Co/CoO microrods were successfully synthesized through a facial and simple method. The resultant porous Co/CoO microrods exhibited superior microwave absorption properties because of their special structure. The high saturation magnetization of ferromagnetic metal Co component made the as-prepared composites have large relative complex permeability. The porous structures of materials improved the impedance match and enhanced the multiple reflections within the materials. With the 70 wt% of functional filler loading, the relative complex permittivity and permeability had significant increase due to the percolation effect. When the thickness of absorber is only 1.20 mm, the effective bandwidth is from 10.83 to 17.84 GHz covered almost Ku band (12-18 GHz). The minimum value of RL (-47.96 dB) was obtained at the frequency of 8.08 GHz with the thickness of only 1.76 mm. The result shows that this material can be used as a candidate for microwave absorption materials at low frequency range with a small thickness. (C) 2017 Elsevier B.V. All rights reserved.