碳化钼/钴复合纳米棒通过“MOFs 加 MOFs”策略实现高效微波吸收,ACS Applied Nano Materials

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碳化钼/钴复合纳米棒通过“MOFs 加 MOFs”策略实现高效微波吸收
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2022-11-30 , DOI: 10.1021/acsanm.2c04460
Beibei Zhao ₁ , Nannan Wu ₁ , Shuyu Yao ₁ , Yucheng Yao ₁ , Yuanyuan Lian ₂ , Bin Li ₃ , Zhihui Zeng ₃ , Jiurong Liu ₃

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在此，我们报告了基于“MOFs 加 MOFs”策略合成一维 (1D) 碳化钼/钴纳米棒，该纳米棒由多种成分组成，包括 Mo ₂ C、Co 和 C (Mo ₂ C/Co/C) . 一维钼金属有机骨架 (MOF) 首先通过回流缩合制备。然后，使用沸石-咪唑酯骨架 (ZIF-67) 作为 Co 源来装饰 1D Mo-MOFs 以形成 Mo-MOFs/ZIF-67 前驱体。最后，通过Mo-MOFs/ZIF-67在Ar气氛下的热解得到一维Mo _{2 C/Co/C三元复合纳米棒。}_{包括电介质Mo 2}在内的多种成分的组合C、C 和磁性 Co 不仅可以优化阻抗匹配，还可以提供多个通道来衰减电磁 (EM) 波，包括传导损耗、介电极化和磁共振。此外，使用高频结构模拟器确认了由Mo ₂ C和Co/C之间丰富的异质界面形成的界面极化。Mo-MOFs的添加量和热解温度对阻抗匹配和微波吸收有显着影响。因此，优化的 Mo ₂ C/Co/C 纳米棒在 16.2 GHz 时表现出最强的反射损耗 (RL) -54.6 dB，对应于 1.77 mm 的厚度。SRL_公吨（RL/匹配厚度）经计算为 30.9，超过了已报道的 MOF 衍生物。此外，通过调整 Mo-MOF 的数量和热解，Mo ₂ C/Co/C 纳米棒表现出宽阔且可调的带宽，涵盖从整个 X 波段（8.0–12.08 GHz）到 Ku 波段（12.56–18.0 GHz）温度，揭示了微波吸收领域的巨大潜力。

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Molybdenum Carbide/Cobalt Composite Nanorods via a “MOFs plus MOFs” Strategy for High-Efficiency Microwave Absorption

Herein, we report the synthesis of one-dimensional (1D) molybdenum carbide/cobalt nanorods that consist of multiple components including Mo₂C, Co, and C (Mo₂C/Co/C) based on a “MOFs plus MOFs” strategy. The 1D Mo-metal–organic frameworks (MOFs) were first prepared through reflux condensation. Then, a zeolitic-imidazolate framework (ZIF-67) was used as the Co source to decorate 1D Mo-MOFs to form the Mo-MOFs/ZIF-67 precursor. Finally, 1D Mo₂C/Co/C ternary composite nanorods were obtained through pyrolysis of Mo-MOFs/ZIF-67 under an Ar atmosphere. The combination of multiple components including dielectric Mo₂C, C, and magnetic Co could not only optimize the impedance matching but also provide multiple channels to attenuate the electromagnetic (EM) waves including conductive loss, dielectric polarization, and magnetic resonance. Besides, the interface polarization formed by abundant heterointerfaces between Mo₂C and Co/C was confirmed using a high-frequency structure simulator. The adding amount of Mo-MOFs and pyrolysis temperature were found to have a significant influence on the impedance matching and microwave absorption. Consequently, the optimized Mo₂C/Co/C nanorods displayed the strongest reflection loss (RL) of −54.6 dB at 16.2 GHz corresponding to a thickness of 1.77 mm. The SRL_mt (RL/matching thickness) was calculated to be 30.9, exceeding those of reported MOF derivates. What is more, the Mo₂C/Co/C nanorods exhibited broad and tunable bandwidth covering from the whole X band (8.0–12.08 GHz) to the Ku band (12.56–18.0 GHz) by adjusting the amount of Mo-MOFs and pyrolysis temperature, revealing great potential for fields of microwave absorption.

更新日期：2022-11-30

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