Xie Hai, Li Jinmei, Yang Rui, Yang Juan, Wang Tingmei, Wang Qihua
Key Laboratory of Science and Technology on Wear and Protection of Materials, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou 730000 China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China.
RSC Adv. 2024 Mar 25;14(14):9791-9797. doi: 10.1039/d3ra08896k. eCollection 2024 Mar 20.
With the coming era of artificial intelligence (AI) dominated by high-tech electronics, developing high-performance microwave absorption materials (MAMs) is imperative to solve the problem of increasing electromagnetic inference and pollution. Herein, a metal-organic framework (MOF)-derived CoNi bimetallic alloy (CoNi/C) with an irregular rod-like structure is prepared by a thermal reduction method. Introducing the CoNi alloy facilitates the balance between conduction loss and polarization loss and forms good impedance matching, leading to excellent microwave absorption performance. Interestingly, the optimization of absorption performance can be further achieved by controllably modulating the molar ratio of Co and Ni (Co/Ni). As expected, the obtained CoNi/C delivers excellent microwave absorption performance with a minimum reflection loss (RL) of -50.80 dB at 10.40 GHz and an effective absorption bandwidth (EAB) of 3.28 GHz (8.91-12.19 GHz) with a filler loading of 50 wt% at 2.0 mm. In addition, the CoNi/C can reach a maximum EAB of 4.77 GHz (12.99-17.76 GHz) at a low thickness of 1.5 mm, spanning nearly the entire Ku band. The CoNi/C also exhibits an impressive RL of -44.84 dB at 3.28 GHz in the S band. This work offers a novel strategy to modulate the magnetic/electric properties of MOF-derived MAMs.
随着以高科技电子为主导的人工智能时代的到来，开发高性能微波吸收材料（MAM）对于解决日益严重的电磁干扰和污染问题至关重要。在此，通过热还原法制备了一种具有不规则棒状结构的金属有机框架（MOF）衍生的CoNi双金属合金（CoNi/C）。引入CoNi合金有助于平衡传导损耗和极化损耗，并形成良好的阻抗匹配，从而产生优异的微波吸收性能。有趣的是，通过可控地调节Co和Ni的摩尔比（Co/Ni），可以进一步实现吸收性能的优化。正如预期的那样，所制备的CoNi/C在10.40 GHz时具有-50.80 dB的最小反射损耗（RL）和3.28 GHz（8.91-12.19 GHz）的有效吸收带宽（EAB），在2.0 mm厚度下填料负载为50 wt%。此外，CoNi/C在1.5 mm的低厚度下可以达到4.77 GHz（12.99-17.76 GHz）的最大EAB，几乎覆盖整个Ku波段。CoNi/C在S波段的3.28 GHz处也表现出令人印象深刻的-44.84 dB的RL。这项工作为调节MOF衍生的MAM的磁/电性能提供了一种新策略。
