摘要
以磁性Fe3O4微球为模板,通过St?ber法和水热法合成了一种杨梅状的新型Fe3O4@SnO2复合材料,主要应用于电磁波吸收领域.借助X射线衍射、X光电子能谱、扫描电子显微镜、透射电子显微镜、振动样品磁强计和矢量网络分析仪对其物相结构、表面元素、微观形貌、磁性及吸波特性进行了分析表征.分析结果表明,杨梅状的Fe3O4@SnO2的球径约为500 nm,无明显团聚,具有良好的形貌均匀性.其SnO2层由纳米SnO2颗粒松散堆叠而成,具有大量的空隙结构,层厚约为40 nm.杨梅状的Fe3O4@SnO2具有较强的介电损耗能力,且有利于提升阻抗匹配性能,呈现出良好的电磁波吸收能力,当厚度为1.4~2.8 mm时,其最小反射损耗RL(min)均低于-20 dB.其最优厚度为1.7 mm,此时RL(min)为-29 dB,有效带宽为4.9 GHz(13.1~18 GHz),是一种具有发展潜力的吸波材料.
Against the background of the widespread application of various electronic devices and communication technologies,there is great concern regarding the problem of excessive radiation of electromagnetic waves with regard to electromagnetic interference,environmental pollution, and human health. Microwave-absorbing materials(MAMs) can transform electromagnetic energy into heat or dissipate electromagnetic waves via interference. Numerous theoretical and experimental studies have focused on the prevention of electromagnetic pollution and other related problems. Magnetite(Fe3O4) is considered one of the most promising MAMs because of its excellent properties, such as high saturation magnetization, high Curie temperature, and low cost. However, the single Fe3O4 has the disadvantages of weak dielectric loss and easy oxidation, thereby limiting its application in the field of microwave absorption.Fabrication of Fe3O4-based nanocomposites is an effective solution for these problems. In this study, a new type of Fe3O4@SnO2 composite similar to myrica rubra(Chinese bayberry) was synthesized by the St?ber method and hydrothermal method using magnetic Fe3O4 microspheres as template. The phase structure, surface elements, micromorphology, magnetic properties, and microwave absorption properties of the samples were characterized by means of X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy and by observations based on a vibrating-sample magnetometer and vector network analyzer. The results show that the diameter of the myrica rubra-like Fe3O4@SnO2 sphere is about 500 nm, without obvious agglomeration, and that it has good morphological uniformity. The SnO2 layer is composed of nano-SnO2 particles, which are loosely stacked. The layer possesses many porous structures and is about 40 nm thick. The myrica rubra-like Fe3O4@SnO2 has strong dielectric loss capacity, is conducive to improving impedance matching performance, and exhibits good electromagnetic wave absorption capacity.When the thickness is 1.4–2.8 mm, RL(min) exceeds-20 dB. The optimum thickness is 1.7 mm, RL(min) is-29 dB, and the effective bandwidth is 4.9 GHz(13.1–18 GHz). It is a potential-absorbing material.
作者
黄威
王玉江
魏世丞
梁义
王博
黄玉炜
徐滨士
HUANG Wei;WANG Yu-jiang;WEI Shi-cheng;LIANG yi;WANG bo;HUANG Yu-wei;XU Bin-shi(National Key Laboratory for Remanufacturing,Academy of Army Armored Forces,Beijing 100072,China)
出处
《工程科学学报》
EI
CSCD
北大核心
2020年第5期635-644,共10页
Chinese Journal of Engineering
