Metal organic framework-derived hierarchical 0D/1D CoPC/CNTs architecture interlaminated in 2D MXene layers for superior absorption of electromagnetic waves

Nowadays, exploring effective electromagnetic wave (EMW) absorbing materials with ultrathin thickness, lightweight, broad absorption bandwidth, and robust absorption capability is crucial to solve EMW pollution issues. Ti 3 C 2 T x is a potential candidate for effective EMW absorbing materials by virtue of its low density, excellent electrical conductivity, high specific surface area, and tunable terminal groups. However, the intrinsic attenuation mechanisms of single dielectric absorbers are limited for practical requirements. Herein, 0D/1D/2D architecture of CoPC/CNTs@MXene hybrids with 0D cobalt nanoparticles supported on porous carbon, 1D carbon nanotubes and 2D Ti 3 C 2 T x nanosheets have been conceptualized and fabricated successfully. By pyrolyzing bimetallic ZnCo-MOF at 800 °C, a 0D/1D hierarchical CoPC/CNTs sample was initially produced, subsequently interlaminated between the Ti 3 C 2 T x matrix via electrostatic self-assembly to fabricate CoPC/CNTs@MXene (CCM) absorbers. The impedance matching properties was optimized by modifying the CoPC/CNTs content. Remarkably, CCM-20 hybrids achieved strong EMW absorption capability (reflection loss of −54.2 dB) at 5.56 GHz, and CCM-30 hybrids achieved ultrathin (1.8 mm) and a broad effective bandwidth (EAB) below − 10 dB (5.6 GHz), which is superior to the magnetic-dielectric hybrids with comparable components reported previously. The exceptional absorption capability can be attributed to the synergistic effects of interface polarizations and magnetic loss. The intricate construction of the 0D/1D/2D architecture facilitates the multiple reflections and scattering of EMW. This work provides an idea for fabricating MXene-based composites with remarkable electromagnetic properties and a broad absorption bandwidth for potential applications. This work proposed a strategy to fabricate 0D/1D/2D architecture CoPC/CNTs@MXene composites, which enabled the synergistic effects of interface polarizations and magnetic loss for superior EMW absorption. • Multi-dimensional CoPC/CNTs@MXene absorbers have been fabricated successfully via pyrolysis and self-assembly. • By modifying the content of CoPC/CNTs, the impedance matching was optimized to achieve high EMW absorption capability. • CoPC/CNTs@MXene absorbers achieved strong EMW absorption capability with RL min of − 54.2 dB and EAB of 5.6 GHz. • The remarkable absorption capability is attributed to the synergistic effects of interface polarizations and magnetic loss.