Super broadband absorbing hierarchical CoFe alloy/porous carbon@carbon nanotubes nanocomposites derived from metal-organic frameworks
Super broadband absorbing hierarchical CoFe alloy/porous carbon@carbon nanotubes nanocomposites derived from metal-organic frameworks
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DOI：
10.1016/j.jmst.2021.11.054
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发表时间：
2022-02
影响因子：
10.9
通讯作者：
Siyao Guo;Y. Bao;Ying Li;Hailong Guan;Dongyi Lei;Tiejun Zhao;Baomin Zhong;Zhihong Li
中科院分区：
文献类型：
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作者：
Siyao Guo;Y. Bao;Ying Li;Hailong Guan;Dongyi Lei;Tiejun Zhao;Baomin Zhong;Zhihong Li
电磁波吸收（EMA）材料的开发越来越受到人们的关注，这不仅是因为电子产品的过度使用所产生的电磁波（EMW）严重威胁着人类的健康，而且还因为EMA材料可以有效地保护雷达隐身不被发现。然而，获得宽带和高效的EMA材料以满足实际应用仍然是一个挑战。本文通过改变金属有机骨架（MOFs）（CoFe-ZIF）前驱体中Fe ~（2+）的比例，采用一步热解法制备了一系列CoFe合金/多孔碳@碳纳米管（CoFe/PC@CNTs）纳米复合材料。CoFe合金、碳纳米管（CNTs）和多孔碳（PC）之间的交叉沉积形成了双导电网络，有利于获得优异的EMA性能。当填料质量分数为10wt%时，优化后的CoFe/PC@CNTs纳米复合材料具有最佳的电磁兼容性能，在13.69 GHz处的最小反射损耗（RLmin）为-68.94 dB，有效吸收带（EAB，< -10 dB）达到9.14 GHz，匹配厚度为2.63 mm。此外，最大的EAB可以在所有匹配厚度期间实现高达11 GHz（3.35-14.35 GHz）。出色的EMA性能得益于双导电网络提供的良好介电损耗，均匀分布的CoFe合金提供的良好磁损耗，以及优异的阻抗匹配，丰富的传输路径和多重极化。因此，这种具有超宽带吸收的EMA材料为轻质和高效的微波吸收剂提供了理想的候选者。
The exploitation of electromagnetic wave absorption (EMA) materials has attracted ever-increasing attention, not only because electromagnetic wave (EMW) originated from overuse of electronic products has threatened human’ health seriously, but also because EMA materials can effectively protect radar stealth from being detected. However, it is still a challenge to obtain broadband and efficient EMA materials to satisfy practical applications. In this work, we developed a series of hierarchical CoFe alloy/porous carbon@carbon nanotubes (CoFe/PC@CNTs) nanocomposites through revising the proportion of Fe2+in the metal-organic frameworks (MOFs) (CoFe-ZIF) precursor and one-step simple pyrolysis process. The cross deposition between CoFe alloy, carbon nanotubes (CNTs), and porous carbon (PC) formed a double conductive network, favoring for achieving excellent EMA property. Surprisingly, when the filler mass ratio is only 10 wt%, the optimized CoFe/PC@CNTs nanocomposites display the best EMA capability, whose minimum reflection loss (RLmin) value is –68.94 dB at 13.69 GHz and the effective absorption band (EAB, < –10 dB) reaches up 9.14 GHz with a matching thickness of 2.63 mm. In addition, the largest EAB can achieve up to 11 GHz (3.35–14.35 GHz) during all matching thicknesses. The splendid EMA performance benefits the favorable dielectric loss provided by the double conductive network, the good magnetic loss benefited from the evenly distributed CoFe alloy, the excellent impedance matching, rich transmission paths, and multiple polarization. Therefore, such EMA materials with super broadband absorbing provide desirable candidates for lightweight and high-efficient microwave absorbers.