Yi Pengshu, Yao Zhengjun, Zhou Jintang, Wei Bo, Lei Lei, Tan Ruiyang, Fan Huiyuan
College of Materials and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China.
Nanoscale. 2021 Feb 7;13(5):3119-3135. doi: 10.1039/d0nr07991j. Epub 2021 Feb 1.
The development of lightweight and high-efficiency microwave absorption materials has attracted wide attention in the field of electromagnetic wave absorption. Herein, two kinds of petal-like Ni-based MOFs were grown on the surface of graphene nanosheets, and then pyrolyzed to obtain new microwave absorbers. The extraordinary microwave absorption performance mainly comes from: the unique petal-like porous carbon framework of MOFs, the 3D conductive network formed by the connection of GNs, the polarization process between the interfaces of multiple heterogeneous components and high impedance matching brought about by magnetic Ni nanoparticles. By adjusting the filling ratio to only 10 wt%, the optimum reflection loss of the prepared composites is up to -53.99 dB, and the effective absorption bandwidth reaches 4.39 GHz when the matching thickness is only 1.4 mm. This work provides not only a facile method for the design and fabrication of two high-efficiency microwave absorbers, but also a reference for the precise control of electromagnetic absorption properties.
轻质高效微波吸收材料的发展在电磁波吸收领域引起了广泛关注。在此，两种花瓣状镍基金属有机框架材料生长在石墨烯纳米片表面，然后进行热解以获得新型微波吸收剂。其优异的微波吸收性能主要源于：金属有机框架材料独特的花瓣状多孔碳骨架、由石墨烯纳米片连接形成的三维导电网络、多种异质组分界面间的极化过程以及磁性镍纳米颗粒带来的高阻抗匹配。通过将填充比例仅调至10 wt%，所制备复合材料的最佳反射损耗高达-53.99 dB，当匹配厚度仅为1.4 mm时，有效吸收带宽达到4.39 GHz。这项工作不仅为两种高效微波吸收剂的设计与制备提供了一种简便方法，也为电磁吸收性能的精确调控提供了参考。
