Song Limeng, Wang Linan, Chen Yongqiang, Wu Hongjing, Song Bozhen, Wang Nannan, Guan Li, Wang Hailong, Zhang Rui, Zhu Yanqiu, Xia Yongde, Fan Bingbing
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, China.
School of Materials Science and Engineering, Zhengzhou University of Aeronautics, Zhengzhou, 450015, China.
Small. 2024 Dec;20(52):e2407563. doi: 10.1002/smll.202407563. Epub 2024 Oct 18.
To enable SiC material to achieve high electromagnetic wave (EMW) absorption performance, solving its impedance mismatch with EMW is necessary. Therefore, a novel approach is proposed for the precise control of impedance matching by adjusting the shell thickness of SiO nanolayers on the surface of SiC nanofibers (NFs). High-angle annular dark field-scanning transmission electron microscopy (HAADF-STEM) reveals the atomic scale oxidation process of SiC, providing fresh insights into the oxidation mechanism. By oxidizing to construct a heterogeneous core-shell structure nanofiber (NF) can effectively lock the incident EMW inside the NF through the generated charges gathered at the interface, forming an electronic barrier that prevents the outward propagation of EMWs. The produced SiC@SiO NFs-3 exhibits exceptional EMW absorption properties, including an impressive minimum reflection loss (RL) of -53.09 dB and a broad maximum effective absorption bandwidth (EAB) of 8.85 GHz. These findings not only deepen understanding of the oxidation mechanism of SiC but also offer valuable insights for further enhancing the EMW absorption capabilities of SiC materials, paving the way for their application in advanced EMW technologies.
为使碳化硅（SiC）材料实现高电磁波（EMW）吸收性能，解决其与EMW的阻抗失配问题很有必要。因此，提出了一种通过调整SiC纳米纤维（NFs）表面SiO纳米层的壳层厚度来精确控制阻抗匹配的新方法。高角度环形暗场扫描透射电子显微镜（HAADF-STEM）揭示了SiC的原子尺度氧化过程，为氧化机理提供了新的见解。通过氧化构建异质核壳结构纳米纤维（NF），可以通过在界面处聚集的生成电荷有效地将入射EMW锁定在NF内部，形成阻止EMW向外传播的电子屏障。所制备的SiC@SiO NFs-3表现出优异的EMW吸收性能，包括令人印象深刻的-53.09 dB的最小反射损耗（RL）和8.85 GHz的宽最大有效吸收带宽（EAB）。这些发现不仅加深了对SiC氧化机理的理解，也为进一步提高SiC材料的EMW吸收能力提供了有价值的见解，为其在先进EMW技术中的应用铺平了道路。
