A composite of Co₃O₄/N-doped carbon (Co₃O₄/N–C) has been successfully fabricated from a MOF precursor by a facile hydrothermal route (150 ​°C) and subsequent annealing process at 700 ​°C under high vacuum conditions. The composite was confirmed to be Co₃O₄ by powder X-ray diffraction (XRD) techniques, while the morphology and components were observed via SEM and EDS. The participation of carbon was proved and the presence of minor N was also convinced by XPS spectra. The Raman spectrum was analyzed to further study the graphitization degree of carbon. The excellent microwave absorption properties of Co₃O₄/N-doped carbon material has been obtained, with the maximum reflection loss as high as −42.6 ​dB ​at only 1.5 ​mm thick and the maximum absorption bandwidth (<−10 ​dB) of 4.08 ​GHz (from 11.03 ​GHz to 15.11 ​GHz) at 2.0 ​mm thick. The excellent microwave absorption of Co₃O₄/N-doped carbon material depends on not only the dielectric loss and impedance matching, but also the geometrical effects.

已通过简便的水热路径（150°C）和随后的700°C退火工艺成功地从MOF前驱体成功制备了Co ₃ O ₄ / N掺杂碳（Co ₃ O ₄ / N–C）的复合材料在高真空条件下。通过粉末X射线衍射（XRD）技术确认该复合物为Co ₃ O ₄，同时通过SEM和EDS观察其形态和组分。XPS光谱证明了碳的参与，并且还证实了次要N的存在。分析拉曼光谱以进一步研究碳的石墨化程度。Co ₃ O ₄的优异微波吸收性能已获得/ N掺杂的碳材料，仅1.5毫米厚时最大反射损耗高达−42.6 dB，最大吸收带宽（<−10 dB）为4.08 GHz（11.03 GHz起）至15.11 GHz）的厚度为2.0毫米。Co ₃ O ₄ / N掺杂碳材料对微波的优异吸收不仅取决于介电损耗和阻抗匹配，还取决于几何效应。