PDF(Pubmed)
Abstract：
Considering the serious electromagnetic wave (EMW) pollution problems and complex application condition, there is a pressing need to amalgamate multiple functionalities within a single substance. However, the effective integration of diverse functions into designed EMW absorption materials still faces the huge challenges. Herein, reduced graphene oxide/carbon foams (RGO/CFs) with two-dimensional/three-dimensional (2D/3D) van der Waals (vdWs) heterostructures were meticulously engineered and synthesized utilizing an efficient methodology involving freeze-drying, immersing absorption, secondary freeze-drying, followed by carbonization treatment. Thanks to their excellent linkage effect of amplified dielectric loss and optimized impedance matching, the designed 2D/3D RGO/CFs vdWs heterostructures demonstrated commendable EMW absorption performances, achieving a broad absorption bandwidth of 6.2 GHz and a reflection loss of - 50.58 dB with the low matching thicknesses. Furthermore, the obtained 2D/3D RGO/CFs vdWs heterostructures also displayed the significant radar stealth properties, good corrosion resistance performances as well as outstanding thermal insulation capabilities, displaying the great potential in complex and variable environments. Accordingly, this work not only demonstrated a straightforward method for fabricating 2D/3D vdWs heterostructures, but also outlined a powerful mixed-dimensional assembly strategy for engineering multifunctional foams for electromagnetic protection, aerospace and other complex conditions.
摘要：
考虑到严重的电磁波污染问题和复杂的应用条件,迫切需要在单一物质中合并多种官能团。然而,将多种功能有效集成到设计的EMW吸收材料中仍然面临着巨大的挑战。在这里，还原氧化石墨烯/碳泡沫（RGO/CFs）与二维/三维（2D/3D）范德华（VDWs）异质结构的精心设计和合成利用涉及冷冻干燥的有效方法，浸没吸收，二次冷冻干燥,其次是碳化处理。由于其优异的连接效应，放大的介电损耗和优化的阻抗匹配，所设计的2D/3DRGO/CFsvdWs异质结构表现出了值得称赞的EMW吸收性能，在低匹配厚度下实现6.2GHz的宽吸收带宽和-50.58dB的反射损耗。此外，获得的2D/3DRGO/CFsVDWs异质结构也显示出显著的雷达隐身特性，良好的耐腐蚀性能以及突出的保温能力，在复杂多变的环境中展示巨大的潜力。因此，这项工作不仅展示了制造2D/3DVDWs异质结构的简单方法，还概述了一种强大的混合维组装策略，用于工程多功能泡沫的电磁防护，航空航天和其他复杂条件。
