0D/1D hollow heterogeneous structure to induce self-assembly of CNTs for optimized self-anticorrosion and electromagnetic wave absorption performance

The electromagnetic wave absorber can absorb and lose electromagnetic waves (EMW) to the greatest extent, through the coordination between the composite components and the rational design of the structure. In this study, a series of multi-component porous composites were prepared by one-pot hydrothermal synthesis and high-temperature calcination catalysis. Under the condition that dicyandiamide provides a carbon source and a nitrogen source, magnetic nanoparticles catalyze the growth of carbon nanotubes (CNTs). Benefiting from the synergistic effect of dielectric loss and magnetic loss, this composite material demonstrated excellent electromagnetic wave absorption performance. Notably, Ni/CrN/VN/CNTs achieve a minimum reflection loss (RL min ) of −52.53 dB at a thickness of 2.4 mm and a maximum effective absorption bandwidth (EAB max ) of 7.3 GHz at a thickness of 2.0 mm. Additionally, electrochemical analysis tests have confirmed its excellent corrosion resistance, further enhanced its overall appeal and expanded its potential applications across various fields.