Xu Jiajun, Bian Chao, Sun Jiayu, Liu Dong, Wang Xiaobin, Xue Zhiwei, Meng Xiuxia, Wu Hongjing
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
School of Chemistry and Chemical Engineering, Shandong University of Technology, Zibo 255049, China.
J Colloid Interface Sci. 2023 Mar 15;634:185-194. doi: 10.1016/j.jcis.2022.12.037. Epub 2022 Dec 12.
The employment of electromagnetic (EM) absorbers integrating elaborate architecture, enhanced microwave absorption and multifunctional features remains a formidable challenge in practical applications including military stealth and incoming 5G electronic information era. Herein, a novel microwave absorber has been fabricated by in-situ growing carbon nanotubes (CNTs) on the prismatic nickel-cobalt (NiCo) clusters derived from Ni-Co layered double hydroxides (NiCo-LDH) via catalytic carbonization of ethyl acetate. The NiCo/CNTs composites with highly porous texture could provide sufficient open space to balance the impedance and introduce magnetic loss mechanism. Accordingly, the absorbers achieved remarkable EM absorption performance with a minimum reflection loss of -46.2 dB at 1.5 mm and broad bandwidth of 5.8 GHz owing to synergistic magnetic-dielectric effects and distinct structural merits. The NiCo/CNTs absorber manifests superior radar wave attenuation by the radar cross section simulation and density functional theory (DFT) was also performed to elucidate the potential mechanisms of the heterostructure formation and performance enhancement in the NiCo/CNTs composites. This work is expected to provide new insights or inspirations to modulate EM properties by rationally designing heterostructure for the elimination of severe EM pollution.
在包括军事隐身和即将到来的5G电子信息时代等实际应用中，采用具有精细结构、增强微波吸收和多功能特性的电磁（EM）吸收器仍然是一项艰巨的挑战。在此，通过乙酸乙酯的催化碳化，在由镍钴层状双氢氧化物（NiCo-LDH）衍生的棱柱形镍钴（NiCo）簇上原位生长碳纳米管（CNT），制备了一种新型微波吸收器。具有高度多孔结构的NiCo/CNT复合材料可以提供足够的开放空间来平衡阻抗并引入磁损耗机制。因此，由于协同的磁电效应和独特的结构优点，该吸收器在1.5毫米处实现了-46.2 dB的最小反射损耗和5.8 GHz的宽带宽，具有卓越的电磁吸收性能。通过雷达截面模拟，NiCo/CNT吸收器表现出优异的雷达波衰减，还进行了密度泛函理论（DFT）以阐明NiCo/CNT复合材料中异质结构形成和性能增强的潜在机制。这项工作有望通过合理设计异质结构来调节电磁特性，为消除严重的电磁污染提供新的见解或灵感。
