Lin Kai, Wu Lingyun, Wu Tianyu, Yuan Caini, Jia Xiaolong, Yang Xiaoping, Sui Gang
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
J Colloid Interface Sci. 2022 Dec;627:90-101. doi: 10.1016/j.jcis.2022.07.048. Epub 2022 Jul 11.
Metal-organic framework materials (MOF) have become a new generation of microwave absorption (MA) materials. However, it is still challenging to design an appropriate microstructure that can efficiently adjust the microwave absorbing characteristics. Herein, a novel bimetal-doped core-shell carbon derived from nickel-cobalt dual-ligand MOF has been successfully prepared. By changing the ratio of the second ligand, the morphology can change from sea urchin-like to rod-like and petal-like shapes, thereby regulating the final wave absorption performance of MOF derivatives. The Bi-MOF-1 exhibited strong microwave absorption (up to -70.70 dB), while Bi-MOF-2 presented broad effective absorption bandwidth (5.92 GHz). The analyses indicated that the excellent impedance matching can be attributed to the double-layer magnetic loss and multiple dielectric loss of the core-shell structure. This work provides a feasible approach for the design and preparation of functional composite structures based on MOF derivatives with controllable microwave absorbing properties.
金属有机框架材料（MOF）已成为新一代的微波吸收（MA）材料。然而，设计一种能够有效调节微波吸收特性的合适微观结构仍然具有挑战性。在此，一种源自镍钴双配体MOF的新型双金属掺杂核壳碳已成功制备。通过改变第二配体的比例，其形态可以从海胆状变为棒状和花瓣状，从而调节MOF衍生物的最终吸波性能。Bi-MOF-1表现出强烈的微波吸收（高达-70.70 dB），而Bi-MOF-2呈现出宽的有效吸收带宽（5.92 GHz）。分析表明，优异的阻抗匹配可归因于核壳结构的双层磁损耗和多重介电损耗。这项工作为基于具有可控微波吸收性能的MOF衍生物设计和制备功能复合结构提供了一种可行的方法。
