4D printing MOF-derived/multi-fluorination nanocomposites for ultra-efficient electromagnetic wave absorption and robust environment adaptivity

Abstract

Advanced microwave absorption materials (MAMs) are required to have strong attenuation capability, intelligent manufacturing, and robust environmental adaptivity for diversified application scenarios. However, the effective integration of multifunctionality in single MAMs is still unprecedented challenge. Herein, the synergistic strategy of in situ growth, C–F⋯π interaction, and microwave irradiation was proposed to fabricate CoM@CoNiC–F nanocomposite. The polarity-induced rigid-flexible epoxy/multifluorination/siloxane networks were chosen as supporting materials, and the bi-continuous phase separation mechanism was clarified. Moreover, the high-resolution and complex 4D-printed objects were obtained by the DIW technology, and it also exhibited reliable dynamic evolution behavior with photo-/thermal-induced shape memory. Furthermore, the absorber exhibited excellent RL_min (−64.78 dB) and wide EAB (4.6 GHz), which was consistent with the RCS simulation results, and it benefited from optimized impedance matching and multiple magnetic–dielectric coupling. Remarkably, the MAMs simultaneously possessed robust protective-multifunctionalities with excellent mechanical, superamphiphobicity, long-term anticorrosion, and flame retardancy performance. This strategy provided an advisable guideline for designing intelligent MAMs and created infinite feasibility in sophisticated and dynamic electromagnetic wave absorption field.