Luo Hui, Ma Beibei, Chen Fu, Zhang Shanshan, Wang Xian, Xiong Yao, Cheng Yongzhi, Gong Rongzhou
School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China.
School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan 430081, People's Republic of China.
J Colloid Interface Sci. 2022 Sep 15;622:181-191. doi: 10.1016/j.jcis.2022.04.054. Epub 2022 Apr 25.
High-performance microwave absorbing materials (MAMs) play a vital role in electromagnetic (EM) pollution protection. Multi-interfacial heterogeneous structure design has become a mainstream direction for designing and fabricating excellent MAMs. Herein, multi-interfacial hollow core-shelled yttrium aluminum garnet@nitrogen-doped carbon (YAG@NC) composites were synthesized by coprecipitation, thermal treatment, self-polymerization and carbonization processes. Thermal treatment temperatures were used to regulate the defect level and interfaces in carbon materials. Defects of NC and multiple interfaces favor dielectric polarization, and the hollow cavity endows the MAMs with lightweight characteristics and ideal impedance matching. The results indicated that YAG@NC composites possess excellent microwave absorption properties with an effective absorption bandwidth (EAB) of 5.5 GHz at an absorber thickness of only 1.95 mm. The radar cross section (RCS) reduction of YAG@NC composites was verified by CST simulation in the far field, and the strongest RCS reduction value was up to 32.64 dBm with a scattering angle of 0°. This work paves the way for designing multicomponent microstructure dielectric loss absorbers with broadband and strong microwave absorption.
高性能微波吸收材料（MAMs）在电磁（EM）污染防护中起着至关重要的作用。多界面异质结构设计已成为设计和制造优异微波吸收材料的主流方向。在此，通过共沉淀、热处理、自聚合和碳化过程合成了多界面空心核壳结构的钇铝石榴石@氮掺杂碳（YAG@NC）复合材料。利用热处理温度来调节碳材料中的缺陷水平和界面。氮掺杂碳（NC）的缺陷和多个界面有利于介电极化，而中空腔赋予了微波吸收材料轻质特性和理想的阻抗匹配。结果表明，YAG@NC复合材料具有优异的微波吸收性能，在仅1.95毫米的吸收体厚度下有效吸收带宽（EAB）为5.5吉赫兹。通过CST在远场模拟验证了YAG@NC复合材料的雷达散射截面（RCS）缩减情况，在散射角为0°时，最强的RCS缩减值高达32.64分贝毫瓦。这项工作为设计具有宽带和强微波吸收性能的多组分微观结构介电损耗吸收体铺平了道路。
