Abstract
Smart electromagnetic interference (EMI) shielding material with a dynamically adjustable electromagnetic response based on real-time requirements is attractive for future electromagnetic devices. Herein, a highly anisotropic [email protected] composite ([email protected]) with convenient shielding effectiveness (SE) regulation is fabricated by coating MXene on the natural wood surface. Benefiting from the anisotropic pore structure and abundant free radicals, the [email protected] displays a better impedance match in the tangential-section than in the cross-section. In the tangential-section, [email protected] can respond to changes in the dihedral angle between the wood grain and the electromagnetic wave electric field, and achieve the off/on switch between electromagnetic wave transmission and shielding. The SE ranges from 27.4 to 57.6 dB as the dihedral angle alters from 90° (perpendicular) to 0° (parallel). The finite element analysis simulation further reveals the tunable electromagnetic response. This sustainable EMI shielding material based on natural wood offers a novel platform for exploiting intelligent electromagnetic devices.
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