Nowadays there is much room for improvement in the designed synthesis of high-performance electromagnetic wave absorbers by combining metal-organic frameworks (MOFs) and biomass components. Herein, 3D N-doped porous carbon cobalt/cobalt oxide (NPC/Co/CoO) composites were successfully prepared by transforming in-situ grown ZIF-67 clusters on a chitosan matrix. Analysis results showed that the N-doped carbonaceous composites obtained had unique porosity, high specific surface area, and defect-enriched structure, which provided numerous paths for electron transfer, leading to big benefits to interfacial polarization and dipole polarization. Most importantly, the ferromagnetic resonance and magnetic coupling were enhanced by ZIF-67-derived Co/CoO nanoparticles. By adjusting the content of metallic cobalt salt, pyrolysis temperature, and sample filling content, the optimal impedance matching properties of the composites could be optimized. When the matching thickness is 2 mm, the RL_min of NPC/Co/CoO-10/700–30 wt% achieved − 48.97 dB at 13.52 GHz, and the effective absorption bandwidth exceeds 5.36 GHz. The composites with excellent performance prepared by a controllable process using chitosan and ZIF-67 might be a promising alternative for the large-scale preparation of high-frequency electromagnetic wave absorbers.

如今，通过结合金属有机骨架（MOF）和生物质成分，设计合成高性能电磁波吸收剂还有很大的改进空间。在此，通过在壳聚糖基质上转化原位生长的 ZIF-67 团簇，成功制备了 3D N 掺杂多孔碳钴/氧化钴 (NPC/Co/CoO) 复合材料。分析结果表明，所得N掺杂碳质复合材料具有独特的孔隙率、高比表面积和富缺陷结构，为电子转移提供了众多途径，对界面极化和偶极极化有很大好处。最重要的是，ZIF-67 衍生的 Co/CoO 纳米粒子增强了铁磁共振和磁耦合。通过调节金属钴盐含量、热解温度，和样品填充含量，可以优化复合材料的最佳阻抗匹配性能。当匹配厚度为2 mm时，RL_{NPC/Co/CoO-10/700–30 wt% 的最小值}在 13.52 GHz 时达到 − 48.97 dB，有效吸收带宽超过 5.36 GHz。使用壳聚糖和 ZIF-67 通过可控工艺制备的具有优异性能的复合材料可能是大规模制备高频电磁波吸收剂的有前途的替代品。