Facile synthesis of Co/La-MOF/Ti₃C₂T_x nanocomposite for electromagnetic wave absorption

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.