Transparent and\nFlexible Electromagnetic Interference\nShielding Materials by Constructing Sandwich AgNW@MXene/Wood Composites

Abstract

Electromagnetic interference (EMI) shielding materials\nhave attracted\nintensive attention with the increased electromagnetic pollution,\nwhich are required to possess high transparency and flexibility for\napplications in visualization windows, aerospace equipment, and wearable\ndevices. However, it remains a challenge to achieve high-performance\nEMI shielding while maintaining excellent light transmittance. Herein,\na sandwich composite is constructed by coating the core material of\ntransparent wood (TW) with silver nanowire (AgNW)@MXene, exhibiting\na maximum transmittance of 28.8% in the visible range and a longitudinal\ntensile strength of 47.8 MPa. The average EMI shielding effectiveness\ncan reach up to 44.0 dB under X-band (8–12.4 GHz), ascribed\nto the increased absorption shielding induced by the multireflection\nof electromagnetic waves within microchannels of the TW layer and\nthe interfacial polarization between AgNW and MXene. Simultaneously,\nlarge-scale EMI shielding films can be conveniently produced by our\nproposed method, which provides inspiration for the development of\nadvanced EMI shielding materials for wide applications.