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首页> 外文期刊>Journal of Applied Polymer Science >S-parameters, electrical permittivity, and absorbing energy measurements of carbon nanotubes-based composites in X-band
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S-parameters, electrical permittivity, and absorbing energy measurements of carbon nanotubes-based composites in X-band

机译：X波段中碳纳米管基复合材料的S参数，电介质和吸收能量测量

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摘要

Composites based on carbon nanotubes (CNT) have recently received great attention as a possible new generation of radar absorbing materials (RAM), due to their efficient microwave attenuation capacity and low density. However, RAM performance can vary significantly depending on the CNT being used. Aiming to directly show the influence of CNT from two different suppliers, both multi-walled and non-functionalized (CNT-B and CNT-K), the electromagnetic behaviors of RAM processed in epoxy resin are compared. Scattering parameters (S-parameters), complex electrical permittivity and magnetic permeability, and absorbed energy of the composites in the X-band (8.2-12.4 GHz) are evaluated. The results clearly show the influence of the two different CNT on the electromagnetic characteristics of composites. CNT-B based composites behave as broadband RAM with the tendency of better attenuation results above 12.4 GHz. On the other hand, CNT-K based composites show good attenuation results in the X-band (>99%). Undoubtedly, the results confirm that the longer length of CNT-K favored the interconnection among the filaments, as well as, the formation of compact agglomerates surrounded by resin rich regions, which favored the impedance matching and mechanisms of losses in the processed RAM.
机译：基于碳纳米管（CNT）的复合材料由于其高效的微波衰减能力和低密度，作为一种可能的新一代雷达吸波材料，近年来受到了广泛关注。然而，RAM性能可能会因所使用的CNT而显著不同。为了直接显示来自两个不同供应商的CNT（多壁和非功能化CNT-B和CNT-K）的影响，比较了在环氧树脂中加工的RAM的电磁行为。计算了复合材料在X波段（8.2-12.4ghz）的散射参数（S参数）、复介电常数和磁导率以及吸收能量。结果清楚地显示了两种不同的碳纳米管对复合材料电磁特性的影响。CNT-B基复合材料表现为宽带RAM，在12.4 GHz以上具有更好的衰减效果。另一方面，CNT-K基复合材料在X波段表现出良好的衰减效果（>99%）。毫无疑问，研究结果证实，较长的CNT-K有利于长丝之间的互连，以及由富含树脂的区域包围的致密团聚体的形成，这有利于阻抗匹配和加工RAM中的损耗机制。

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