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Advances in microwave absorbing materials with broad-bandwidth response

Nano Research 2023年第8期16卷 11054-11083页

作者： Susu Bao Meixi Zhang Zhiyuan Jiang Zhaoxiong Xie Lansun Zheng State Key Laboratory for Physical Chemistry of Solid Surfaces College of Chemistry and Chemical EngineeringXiamen UniversityXiamen 361005China

microwave absorbing materials(MAMs)are playing an increasingly essential role in the development of wireless communications,high-power electronic devices,and advanced target detection technology.MAMs with a broad-bandwidth response are particularly important in the area of communication security,radiation prevention,electronic reliability,and military stealth.Although considerable progress has been made in the design and preparation of MAMs with a broad-bandwidth response,a number of challenges still remain,and the structure–function relationship of MAMs is still far from being completely understood.Herein,the advances in the design and research of MAMs with a broad-bandwidth response are outlined.The main strategies for expanding the effective absorption bandwidth of MAMs are comprehensively summarized considering three perspectives:the chemical combination strategy,morphological control strategy,and macrostructure control strategy.Several important results as well as design principles and absorption mechanisms are highlighted.A coherent explanation detailing the influence of the chemical composition and structure of various materials on the microwave absorption properties of MAMs is provided.The main challenges,new opportunities,and future perspectives in this promising field are also presented.

关键词： microwave absorbing materials broad-bandwidth response magnetic-dielectric synergy morphology control macrostructure control

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Preparation of microwave absorbing Films with Carbon Nanotubes by Layer-by-Layer Assembly

Preparation of Microwave Absorbing Films with Carbon Nanotub...

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作者： Christine CHENH（黎慧敏）东华大学

学位级别：硕士

The proliferation of electronics equipments has led to a new kind of pollution:the electromagnetic interference. microwave-absorbing materials have been attracting more and more attention in electromagnetic protection field, due to their conversion properties from electromagnetic energy to heat. Thin, flexible, light weight microwave absorbing materials are desirable in various applications including customers products, protective clothing and the military field. Here, a controllable design of microwave-absorbing textiles is prepared using the Layer-by-Layer (LbL) assembled technique. In this research work, LBL assembly technique was used to prepare microwave-absorbing cotton fabric with multi-walled carbon nanotubes (MWNTs) coating. Interestingly, a thin CNTs film prepared with10bilayers on cotton exhibit54%of absorption at10.86GHz with a matching total shielding effectiveness of55.1%. The absorption is the dominant shielding mechanism of our samples. This method has large potential for building new microwave absorbing textiles with improved performance.

关键词： microwave absorbing materials Carbon nanotubes (CNTs) Layer-by-Layerassembly Functional films

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microwave-absorbing Properties of La_(1-x)Sr_xMn_ (1-y)Fe_yO_3

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Journal of Rare Earths 2006年第3期24卷 313-313页

作者： Wang Da Zhou Kesheng Yin Lisong Chen Mintao Deng Jianjie School of Physics Science and Technology Central South University . Changsha 410083 China

The experiment samples of La1-xSrxMn1-y FeyO3（x = 0. 15, 0.20, 0.23; y = 0. 10, 0. 12, 0.14, 0.16） were prepared by sol-gel process, and the loss tangent and absorption coefficient in the range of 2 - 18 GHz were measured by HP8722 net analyzing apparatus. It is found that changing the content of Sr or Fe would effect the microwave absorbing. When the thickness of La1-x SrxMn1-y FeyO3 is 2 mm and x =0.20, y = 0.14, the capability of microwave absorbing is the best one. There are two absorption peaks; the maximum is 34 dB and effective band width with 10 dB and more reaches 6.2 GHz.

关键词： microwave absorbing materials magnetic loss dielectric loss rare earths

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