Constructing interfacial polarization sites within a honeycomb-like porous structure via a spatially confined-etching strategy for boosting electromagnetic wave absorption

Abstract

In the face of increasingly serious electromagnetic radiation pollution, there is an urgent need to develop new materials with efficient electromagnetic wave absorption. Heterointerface engineering can control the electromagnetic characteristics by adjusting the conductivity and complex permittivity to achieve excellent electromagnetic wave absorption ability. Herein, inspired by honeycomb with an ordered porous structure, we designed a N-doped honeycomb-like porous carbon matrix via a spatially confined-etching strategy, and ultra-fine sized Mo₂C nanoparticles were embedded to construct multiple heterointerfaces. Simultaneously, the unique 3D structure successfully prevents the agglomeration of nanoparticles, which is conducive to deeply constructing heterointerfaces and thus enhancing interfacial polarization. Furthermore, the doping of heteroatoms can also trigger strong dipole polarization to improve electromagnetic energy conversion efficiency. Consequently, the composite combined honeycomb-like porous structure with rich Mo₂C/C heterointerfaces presents outstanding electromagnetic absorption with a minimum reflection loss value of −65 dB and effective absorption bandwidth up to 5.52 GHz. This study provides new strategies and insights for heterointerface engineering to achieve efficient electromagnetic absorption performance and has broad application prospects in the field of electromagnetic wave absorption.