Two-dimensional nanomaterial MXene Ti₃C₂T_x with excellent electrical conductivity has received extensive attention in the electromagnetic wave (EMW) absorption field. However, the excessively high permittivity of Ti₃C₂T_x is not conducive to impedance matching and the absorption of EMW. Considering the low permittivity and mesoporous structure of MOF, in this work, Co/La-MOF were in situ growth on the surfaces of Ti₃C₂T_x by a facile co-solvothermal method. The obtained Co/La-MOF anchored on Ti₃C₂T_x (Co/La-MOF/Ti₃C₂T_x) composite exhibits low density with excellent EMW absorption performance. Co/La-MOF/Ti₃C₂T_x-2 (Co²⁺/La³⁺ mass ratio of 16:3) shows the minimum reflection loss of -44.15 dB at 4.00 GHz with the effective absorption bandwidth of 3.67 GHz in the frequency range of 14.03-17.70 GHz under 1.3 mm. In addition, the electromagnetic absorption mechanism of Co/La-MOF/Ti₃C₂T_x was also investigated. It provides an effective strategy for the preparation of a novel absorber with high EMW absorbing performance.

具有优异导电性的二维纳米材料MXene Ti ₃ C ₂ T _x在电磁波（EMW）吸收领域受到广泛关注。_{但是Ti 3} C ₂ T _x过高的介电常数不利于阻抗匹配和EMW的吸收。考虑到 MOF 的低介电常数和介孔结构，在这项工作中，Co/La-MOF通过简便的共溶剂热法在 Ti ₃ C ₂ T _x表面原位生长。获得的 Co/La-MOF 锚定在 Ti ₃ C ₂ T _x(Co/La-MOF/Ti ₃ C ₂ T _x )复合材料具有低密度和优异的EMW吸收性能。Co/La-MOF/Ti ₃ C ₂ T _x -2（Co ²⁺ /La ³⁺质量比为 16:3） 在 4.00 GHz 时的最小反射损耗为 -44.15 dB  ，有效吸收带宽为 3.67  GHz 1.3 毫米以下的频率范围为 14.03-17.70  GHz  。此外，Co/La-MOF/Ti ₃ C ₂ T _{x的电磁吸收机制}也被调查了。它为制备具有高电磁波吸收性能的新型吸收体提供了有效的策略。