CIPs@Mn_(0.8)Zn_(0.2)Fe_(2)O_(4)-CNTs复合材料低频吸波性能研究  

Low-frequency Microwave Absorption of CIPs@Mn_(0.8)Zn_(0.2)Fe_(2)O_(4)-CNTs Composites

作　　者：陈海燕[1] 唐志鹏 尹良君[1] 张林博[1] 徐鑫[2] CHEN Haiyan;TANG Zhipeng;YIN Liangjun;ZHANG Linbo;XU Xin(Key Laboratory of Multi-spectral Absorbing Materials and Structures of Ministry of Education,National Engineering Research Center of Electromagnetic Radiation Control Materials,School of Electronic Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China;Laboratory of Materials for Energy Conversion,Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]电子科技大学电子科学与工程学院,国家电磁辐射控制材料工程技术中心,多频谱吸波材料与结构教育部重点实验室,成都611731 [2]中国科学技术大学材料科学与工程系,能量转换材料重点实验室,合肥230026

出　　处：《无机材料学报》2024年第1期71-80,I0003,I0004,共12页Journal of Inorganic Materials

基　　金：国家自然科学基金(52021001,51972046)。

摘　　要：随着5G无线通信与低频雷达侦察技术的飞速发展,低频电磁波辐射已成为当代的严重问题。目前,中高频段吸波材料的研究已趋于成熟,而设计低频段吸波材料仍面临巨大的挑战,亟待研究者们解决。基于四分之一波长相消机制,本研究设计了0.5~3 GHz低频段复合吸波材料。采用简单的一步水热法,诱导铁氧体在羰基铁粉与碳纳米管表面生长,制备出CIPs@Mn_(0.8)Zn_(0.2)Fe_(2)O_(4)-CNTs三元复合材料,对比研究了碳纳米管含量对材料吸收峰频率的影响。实验结果表明,引入碳纳米管,一方面为材料带来了界面极化、偶极极化等额外的损耗机制,增加了材料的衰减系数;另一方面基于四分之一波长相消机制,高介电与高磁导率的耦合,使材料在低频段获得良好的阻抗匹配。最终,在4 mm厚度下,样品分别在2.11与1.75 GHz处,获得了–40.8与–32.1 dB的反射损耗,–10 dB带宽分别为1.70~2.70 GHz和1.40~2.20 GHz。该复合材料制备工艺简单,低频吸收性能良好,具有很大的应用潜力,为开发更有效的低频吸波材料提供了新的思路和方法。Development of 5 G wireless communication and low-frequency radar detection has made low-frequency electromagnetic wave radiation a serious problem today.Although research on medium and high frequency band absorbing materials is now relatively mature,designing low frequency band absorbing materials remains a major challenge.Here,we designed a low-band composite absorbing material of 0.5–3 GHz based on the quarter-wavelength cancellation mechanism.A CIPs@Mn_(0.8)Zn_(0.2)Fe_(2)O_(4)-CNTs ternary composites were prepared by using a simple one-step hydrothermal method,which involved growing ferrite on the surface of carbonyl iron powder and carbon nanotubes.The influence of carbon nanotube content on the absorption peak frequency of the material was investigated.Experimental results show that carbon nanotubes enhances the material's attenuation coefficient by introducing additional interfacial polarization,dipole polarization and other loss mechanisms.Furthermore,coupling of high dielectric and high permeability enables the material to achieve better impedance matching in the low frequency band based on the quarter-wavelength cancellation mechanism.At a thickness of 4 mm,the reflection loss of the samples was obtained at 2.11 GHz and 1.75 GHz,with a–10 dB bandwidth of 1.70–2.70 GHz and 1.40–2.20 GHz,respectively.The composites exhibit excellent low-frequency absorption performance,endowing it highly suitable for applications helped by its simple preparation process and well low-frequency absorption.This research provides a new method for developing more effective low-frequency absorbing materials.

关 键 词：碳纳米管 复合材料 羰基铁粉 波长相消 低频吸波 

分 类 号：TB332[一般工业技术—材料科学与工程] O441[理学—电磁学]