Lotus Leaf-Derived Gradient Hierarchical Porous C/MoS(2) Morphology Genetic Composites with Wideband and Tunable Electromagnetic Absorption Performance.
Lotus Leaf-Derived Gradient Hierarchical Porous C/MoS(2) Morphology Genetic Composites with Wideband and Tunable Electromagnetic Absorption Performance.
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具有宽带和可调电磁吸收性能的荷叶梯度分级多孔 C/MoS2 形貌遗传复合材料
DOI：
10.1007/s40820-020-00568-1
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发表时间：
2021-01-04
影响因子：
26.6
通讯作者：
Lu W
中科院分区：
文献类型：
--
作者：
Pan F;Liu Z;Deng B;Dong Y;Zhu X;Huang C;Lu W
制备了荷叶源梯度分级多孔C/MoS2形貌遗传复合材料纳米复合材料。实现了出色的电磁吸收性能，RLmin为− 50.1 dB，EBW为6.0 GHz。提出了一种全新的介电和商模型，该模型与实验结果吻合较好。本文的在线版本（10.1007/s40820 - 020 - 00568 - 1）包含补充材料，可供授权用户使用。受自然界的启发，采用原位合成法成功制备了荷叶源梯度分级多孔C/MoS2复合材料（GHPCM）。处理后荷叶的生物显微结构保存较好。复合材料中的孔隙呈阶梯状分布，孔径梯度为300~5 μ m。此外，荷叶的表面状态导致了MoS2的Janus状形貌。GHPCM具有优异的电磁波吸收性能，在2.4 mm厚度下的最小反射损耗为− 50.1 dB，在2.2 mm厚度下的最大有效带宽为6.0 GHz。其优异的性能可归因于传导损耗、极化损耗和阻抗匹配的协同作用。特别地，我们提出了一种全新的介电和商模型来分析非磁性材料系统的电磁性能。这表明，特定的介电常数和商是在一定频率范围内保持反射损耗低于− 10 dB的关键。此外，基于材料基因工程的概念，可以考虑介电常数，以寻求合适的材料具有可设计的电磁吸收性能。本文的在线版本（10.1007/s40820 - 020 - 00568 - 1）包含补充材料，可供授权用户使用。
Lotus leaf-derived gradient hierarchical porous C/MoS2 morphology genetic composites nanocomposites were fabricated. Excellent electromagnetic absorption performance was achieved with RLmin of − 50.1 dB and EBW of 6.0 GHz. A brand-new dielectric sum-quotient model was proposed and corresponded well to the experimental results. The online version of this article (10.1007/s40820-020-00568-1) contains supplementary material, which is available to authorized users. Inspired by the nature, lotus leaf-derived gradient hierarchical porous C/MoS2 morphology genetic composites (GHPCM) were successfully fabricated through an in situ strategy. The biological microstructure of lotus leaf was well preserved after treatment. Different pores with gradient pore sizes ranging from 300 to 5 μm were hierarchically distributed in the composites. In addition, the surface states of lotus leaf resulted in the Janus-like morphologies of MoS2. The GHPCM exhibit excellent electromagnetic wave absorption performance, with the minimum reflection loss of − 50.1 dB at a thickness of 2.4 mm and the maximum effective bandwidth of 6.0 GHz at a thickness of 2.2 mm. The outstanding performance could be attributed to the synergy of conductive loss, polarization loss, and impedance matching. In particularly, we provided a brand-new dielectric sum-quotient model to analyze the electromagnetic performance of the non-magnetic material system. It suggests that the specific sum and quotient of permittivity are the key to keep reflection loss below − 10 dB within a certain frequency range. Furthermore, based on the concept of material genetic engineering, the dielectric constant could be taken into account to seek for suitable materials with designable electromagnetic absorption performance. The online version of this article (10.1007/s40820-020-00568-1) contains supplementary material, which is available to authorized users.
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