0D-1D-2D multidimensionally assembled Co9S8/CNTs/MoS2 composites for ultralight and broadband electromagnetic wave absorption
0D-1D-2D multidimensionally assembled Co9S8/CNTs/MoS2 composites for ultralight and broadband electromagnetic wave absorption
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用于超轻和宽带电磁波吸收的0D-1D-2D多维组装Co9S8/CNTs/MoS2复合材料
DOI：
10.1016/j.cej.2021.130132
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发表时间：
2021
影响因子：
15.1
通讯作者：
Yu Ronghai
中科院分区：
文献类型：
--
作者：
Sun Xin;Pu Yanhui;Wu Fan;He Junzhe;Deng Gao;Song Zhiming;Liu Xiaofang;Shui Jianglan;Yu Ronghai
合理的层次化结构设计是制备高性能吸波材料的关键。本文将MoS2纳米片和Co9S8颗粒组装在金属有机骨架化合物衍生的碳纳米管微笼上，制备了一维一维杂化的Co9S8/CNTs/MoS2复合材料。这种多维杂化结构不仅可以避免MoS2纳米片层的重新堆积和Co9S8颗粒的团聚，而且可以最大限度地发挥三组分的协同作用。具有适当导电性的碳纳米管多孔微笼增加了传导损耗，促进了阻抗匹配。MoS2纳米片聚集成褶皱的表面，提供本征极化损耗，增加EMW散射面积。随机分布的Co9S8颗粒作为介电添加剂，增强界面极化效应。Co9S8/CNTs/MoS2复合材料在减少填充量和展宽吸收带宽方面表现出明显的EMW吸收性能。在9 GHz的超低填充负载下，最小RL值达到−35.4 GHz，有效吸收带宽提高到8.4 GHz。通过对电场分布和雷达散射截面的模拟，进一步揭示了Co9S8/CNTs/MoS2对电磁散射辐射的显著抑制作用。
Rational design of hierarchical structure is essential for preparing high-performance electromagnetic wave (EMW) absorbing materials. Herein, 0D-1D-2D hybridized Co9S8/CNTs/MoS2composite is prepared by assembling MoS2nanosheets and Co9S8particles on metal organic framework compound-derived CNT microcages. This multidimensionally hybridized structure can not only avoid the restacking of MoS2nanosheets and the agglomeration of Co9S8particles, but also maximize the synergistic effect of three components. CNT porous microcages with proper conductivity increase conduction loss and promote impedance matching. MoS2nanosheets assemble into wrinkled surfaces, providing intrinsic polarization loss and increasing EMW scattering area. Randomly distributed Co9S8particles work as dielectric additives to enhance interfacial polarization effect. Co9S8/CNTs/MoS2composite exhibits significantly improved EMW absorbing properties in reducing filler loading and broadening absorption bandwidth. At an ultralow filler loading of 9 wt%, the minimum RL value achieves −35.4 dB, and the effective absorption bandwidth boosts to 8.4 GHz. By simulating the electric field distribution and radar scatter section, we further reveal the significant suppression effect of Co9S8/CNTs/MoS2on electromagnetic scattering radiation.
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