摘要
用静电纺丝和氢气还原法制备FeCo/SnO_(2)复合纳米纤维并使用X射线衍射、扫描电子显微镜、振动样品磁强计和矢量网络分析仪等手段分析表征其结构、形貌、磁性及电磁特性,研究了SnO_(2)含量对复合纳米纤维的吸波性能的影响。结果表明,添加适量的SnO_(2)可显著提高FeCo纳米纤维的吸波性能。用SnO_(2)摩尔含量为20%的复合纳米纤维制备的厚度仅为1.4 mm的涂层,在频率10.95 GHz处最小反射损耗(RL)为-40.2 dB,有效吸收带宽(RL≤-10 dB)为2.64 GHz (9.75-12.39 GHz),厚度减小到1.0 mm的涂层其最大有效吸收带宽为4.16 GHz,频率范围为13.84~18.00 GHz。涂层吸波性能优异的主要原因,是阻抗匹配的改善、磁性FeCo合金与介电SnO_(2)的电磁损耗协同作用、加强的界面极化驰豫以及纳米纤维形成的三维网络结构产生的多重反射与散射。
A novel nanofibrous absorber composed of FeCo alloy and SnO_(2)has been synthesized through electrospinning coupled with hydrogen reduction. Its structure, morphology, magnetic and electromagnetic properties were characterized by X-ray diffractometer, scanning electron microscopy, vibrating sample magnetometer and vector network analyzer, and the effect of the molar ratio of SnO_(2)to FeCo on the microwave absorption properties of the composite nanofibers is investigated. It was found that the introduction of an appropriate amount of SnO_(2)can significantly enhance the microwave absorption properties of FeCo/SnO_(2)nanofibers as a result of the improved impedance matching, the good synergistic effect between magnetic FeCo alloy and dielectric SnO_(2), and the enhanced interfacial polarization relaxation,as well as the multiple scattering and reflection caused by the 3D network structure formed by the nanofibers. When the SnO_(2)molar content in the nanofibers is 20% the minimal reflection loss value of-40.2 dB is obtained at 10.95 GHz for a thin coating of 1.4 mm, and the corresponding effective absorption bandwidth with reflection loss lower than-10.0 dB is about 2.64 GHz(9.75-12.39 GHz). Moreover, when the coating thickness is reduced to 1.0 mm, the effective absorption bandwidth reaches 4.16 GHz(13.84~18.00 GHz). These excellent absorbing performances suggest that the FeCo/SnO_(2)composite nanofibers designed here could be a promising electromagnetic absorbing material with a strong and broad absorption band.
作者
张开银
王秋玲
向军
ZHANG Kaiyin;WANG Qiuling;XIANG Jun(School of Mechanical and Electrical Engineering,Wuyi University,Wuyishan 354300,China;School of Science,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2023年第2期102-110,共9页
Chinese Journal of Materials Research
基金
福建省自然科学基金(2020J01393)
国家自然基金(51271059)
武夷学院引进人才科研启动项目(YJ202115、YJ202116)。
