A MOFs-derived 3D superstructure nanocomposite as excellent microwave absorber

Developing an expandable microstructure method to acquire high-performance microwave absorbers is an effective strategy to prevent electromagnetic wave radiation pollution. In this study, a three-dimensional (3D) conductive network is constructed using 1D carbon nanotubes (CNTs) derived from Ni (hollow and solid microsphere structure) metal-organic-frameworks (MOFs) and 2D Ti3C2Tx MXene simultaneously to form a superstructure composite material. The results of the experiment and analysis confirm the successful synthesis of 3D superstructure composites with excellent microwave absorption (MA) properties. The optimal reflection loss (RL) is - 57.78 dB with a thickness of 1.49 mm at 8.4 GHz, and the maximum effective absorption bandwidth is 3.44 GHz for a thickness of 0.8 mm. In the unique 3D superstructure, microwave attenuation capacity and impedance matching are optimized under the synergistic effect of multiple resonances and polarization relaxation. Simultaneously, adjustable and efficient MA between the C and X bands is achieved by modulating the loading of the Ni particle hybrid. It is anticipated that this superstructure composite material can be used for a new generation of microwave absorbers.