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Synthesis of sandwich-like Co15Fe85@C/RGO multicomponent composites with tunable electromagnetic parameters and microwave absorption performance.
Nanoscale ( IF 6.7 ) Pub Date : 2020-08-12 , DOI: 10.1039/d0nr04615a
Susu Bao 1 , Wen Tang , Zhijia Song , Qiaorong Jiang , Zhiyuan Jiang , Zhaoxiong Xie
Affiliation  

Magnetic particle/carbon hybrid structures are promising candidates for high performance microwave absorbing materials with light weight and strong absorption. However, it remains a great challenge to balance the permittivity and permeability to realize impedance matching and further improve their absorption bandwidth. Herein, an effective strategy is designed to fabricate sandwich-like Co15Fe85@C/RGO composites. By introducing RGO sheets in the hybrid structures, the electromagnetic parameters, impedance matching and microwave absorption properties of the final materials can be well controlled. The optimized Co15Fe85@C/RGO composite shows an excellent microwave absorption performance, the strongest reflection loss (RL) of the sample is up to −33.38 dB at 10.72 GHz with a matching thickness of 2.5 mm, and the effective bandwidth (RL < −10 dB) can reach 9.2 GHz (8.64–17.84 GHz). With a single thickness, such a wide absorption band is rarely reported. Their excellent performance can be ascribed to the synergetic effect of the chemical composition and unique sandwich-like structures, which will improve impendence matching and strong microwave attenuation constants of the composites. Our results provide a facile strategy for tuning the electromagnetic parameters and microwave absorption properties of magnetic metal/carbon hybrid structures.

中文翻译:

具有可调电磁参数和微波吸收性能的三明治状Co15Fe85 @ C / RGO多组分复合材料的合成。

磁性颗粒/碳杂化结构有望成为重量轻且吸收强的高性能微波吸收材料的候选材料。然而,平衡介电常数和磁导率以实现阻抗匹配并进一步提高其吸收带宽仍然是一个巨大的挑战。在此,设计一种有效的策略来制造夹心状的Co 15 Fe 85 @ C / RGO复合材料。通过在混合结构中引入RGO板,可以很好地控制最终材料的电磁参数,阻抗匹配和微波吸收特性。优化的Co 15 Fe 85@ C / RGO复合材料显示出优异的微波吸收性能,样品的最强反射损耗(RL)在10.72 GHz时高达-33.38 dB,匹配厚度为2.5 mm,有效带宽(RL <-10 dB)可以达到9.2 GHz(8.64–17.84 GHz)。对于单个厚度,很少报道这样宽的吸收带。它们的优异性能归因于化学成分和独特的三明治状结构的协同作用,这将改善复合材料的阻抗匹配和强大的微波衰减常数。我们的结果为调节磁性金属/碳杂化结构的电磁参数和微波吸收特性提供了一种简便的策略。
更新日期:2020-09-24
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