Wood-based materials possess unique porous structure that are sustainable and green, showing great potential in many applications. Herein, MXene@Wood composites were prepared for electromagnetic interference shielding and thermal insulation, and their pore structure is monitored by compression of wood. Benefiting from the heterogeneous interface between MXene and the wood surface to enhance interfacial polarization, MXene@Wood presents a superior impedance match in cross-section compared to tangential-section. In the cross-section, MXene@Wood at a 30 % compression ratio achieves an absorption coefficient of 0.73 and a shielding effectiveness of 41.78 dB. After a 30 % compression ratio, MXene@Wood in cross-section achieves an absorption coefficient of 0.73 and a shielding effectiveness of 41.78 dB, it also exhibits wave absorption performance with a minimum reflection loss of −15.11 dB at 2 mm, meeting the commercial requirements. The effect of the pore structure of wood on shielding performance is further verified by finite element analysis. Furthermore, MXene@Wood also demonstrates excellent thermal insulation properties benefit to the reduced gas-phase heat transfer. This sustainable composite with electromagnetic shielding performance and thermal insulation properties largely expands the application area of wood.

中文翻译：

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MXene@Wood 通过结构改性实现以吸收为主的电磁干扰屏蔽性能的复合材料


木质材料具有独特的多孔结构，可持续且绿色，在许多应用中显示出巨大的潜力。本文制备了 MXene@Wood 复合材料用于电磁干扰屏蔽和隔热，并通过木材压缩来监测其孔隙结构。得益于 MXene 和木材表面之间的异质界面增强了界面极化，与切向截面相比，MXene@Wood 在横截面上表现出优异的阻抗匹配。在横截面中，压缩比为 30 % 的 MXene@Wood 可实现 0.73 的吸收系数和 41.78 dB 的屏蔽效果。在 30% 的压缩比下，横截面MXene@Wood达到 0.73 的吸收系数和 41.78 dB 的屏蔽效果，它还表现出波吸收性能，在 2 mm 处的最小反射损耗为 -15.11 dB，满足商业要求。通过有限元分析进一步验证了木材孔结构对屏蔽性能的影响。此外，MXene@Wood还表现出优异的隔热性能，有利于减少气相传热。这种具有电磁屏蔽性能和隔热性能的可持续复合材料在很大程度上扩展了木材的应用领域。