Chen Geng, Zhang Limin, Fan Xiaomeng, Wu Hongjing
MOE Key Laboratory of Material Physics and Chemistry under Extraordinary, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China.
Science and Technology on Thermostructural Composite Materials Laboratory, Northwestern Polytechnical University, Xi'an 710072, China.
J Colloid Interface Sci. 2021 Apr 15;588:813-825. doi: 10.1016/j.jcis.2020.11.117. Epub 2020 Dec 1.
Manufacturing advanced absorbers is an effective way to deal with the greater electromagnetic pollution challenges associated with the application of 5G technology. While reasonable morphology design is an efficacious method to improve the absorption performance of the absorber. Herein, a series of Co-based spinel CoO/ACoO (A = Ni, Cu, Zn) were successfully synthesized via a facile PVP-assisted hydrothermal method. It is worth mentioning that the CoO/ZnCoO with MXene-like laminated structure was synthesized successfully for the first time (to our knowledge) by changing the type of elements in A position. The EAB of MXene-like laminated CoO/ZnCoO absorber can reach 6.24 GHz (from 11.6 to 17.84 GHz) with a matching thickness of 2.62 mm. This excellent performance can be attributed to the multiple scattering, interfacial polarization, and polarization induced by lattice defects and oxygen vacancies (the dominant). This work offers a novel pattern for improving the EMW absorption ability of pure spinel by manufacturing MXene-like laminated Co-based spinel and adjusting annealing temperature reasonably.
制造先进的吸波材料是应对与5G技术应用相关的更大电磁污染挑战的有效方法。而合理的形貌设计是提高吸波材料吸收性能的有效手段。在此，通过简便的聚乙烯吡咯烷酮辅助水热法成功合成了一系列钴基尖晶石CoO/ACoO（A = Ni、Cu、Zn）。值得一提的是，通过改变A位元素类型，首次（据我们所知）成功合成了具有类MXene层状结构的CoO/ZnCoO。类MXene层状CoO/ZnCoO吸波材料的有效吸收带宽可达6.24 GHz（从11.6到17.84 GHz），匹配厚度为2.62 mm。这种优异的性能可归因于多重散射、界面极化以及由晶格缺陷和氧空位引起的极化（占主导）。这项工作通过制造类MXene层状钴基尖晶石并合理调节退火温度，为提高纯尖晶石的电磁波吸收能力提供了一种新的模式。
