Anisotropic MXene@Wood Composites for Tunable Electromagnetic Interference Shielding

Abstract

To comply with the increasingly complex and changeful application environment, realizing effective shielding effectiveness (SE) adjustment is the trend of next-generation electromagnetic interference (EMI) shielding materials. Herein, we utilize the natural wood as substrate, and MXene sheets are coated to the wood surface to develop anisotropic MXene@wood (M@W) composites with outstanding EMI shielding performance. The M@W displays apparent different properties between cross section and tangential section, in terms of pore structure, dielectric properties, polarization relaxation, impedance matching condition, and EMI SE. In the tangential section, the angle between wood grain and the electric field direction of incident electromagnetic wave governs the shielding performance. The EMI SE ranges from 57.6 dB to 27.4 dB when the angle changes from 0° (parallel to grain of wood) to 90° (perpendicular to grain of wood). This finding provides invaluable guidance for the design of anisotropic materials with convenient EMI shielding performance regulation.