The CoFe₂O₄ polyhedron encapsulated by the interconnected carbon nanotubes (CNTs) network has been successfully prepared from analogous metal-organic framework (MOF) precursor, which has bimetallic species (Fe and Co) and organic ligand (2, 5-dihydroxyterephthalate acid, DHTA). The composite can be obtained through a simple hydrothermal process and subsequent calcination. The results demonstrate that the minimum reflection loss of the CoFe₂O₄@CNTs can reach −34.6 dB with thickness of 2.5 mm at 13.4 GHz, as well as the effective absorption bandwidth reaches 7.1 GHz (10.0–17.1 GHz). This work proves that the 3D conductive network CNTs coated CoFe₂O₄ composite can provide novel ideas for the design of high-absorptive microwave absorbers and the preparation of CNTs-modified metal composites.

由相互连接的碳纳米管 (CNT) 网络封装的 CoFe ₂ O ₄多面体已成功地由类似的金属有机骨架 (MOF) 前驱体制备，该前驱体具有双金属物质 (Fe 和 Co) 和有机配体 (2, 5-二羟基对苯二甲酸, DHTA)。该复合材料可以通过简单的水热工艺和随后的煅烧获得。结果表明，CoFe ₂ O ₄ @CNTs 在 13.4 GHz 厚度为 2.5 mm 时的最小反射损耗可达 -34.6 dB，有效吸收带宽可达 7.1 GHz (10.0–17.1 GHz)。这项工作证明了 3D 导电网络 CNTs 包覆了 CoFe ₂ O ₄ 复合材料可以为高吸收微波吸收剂的设计和碳纳米管改性金属复合材料的制备提供新的思路。