Electromagnetic interference (EMI) shielding materials
have attracted
intensive attention with the increased electromagnetic pollution,
which are required to possess high transparency and flexibility for
applications in visualization windows, aerospace equipment, and wearable
devices. However, it remains a challenge to achieve high-performance
EMI shielding while maintaining excellent light transmittance. Herein,
a sandwich composite is constructed by coating the core material of
transparent wood (TW) with silver nanowire (AgNW)@MXene, exhibiting
a maximum transmittance of 28.8% in the visible range and a longitudinal
tensile strength of 47.8 MPa. The average EMI shielding effectiveness
can reach up to 44.0 dB under X-band (8–12.4 GHz), ascribed
to the increased absorption shielding induced by the multireflection
of electromagnetic waves within microchannels of the TW layer and
the interfacial polarization between AgNW and MXene. Simultaneously,
large-scale EMI shielding films can be conveniently produced by our
proposed method, which provides inspiration for the development of
advanced EMI shielding materials for wide applications.
Despite the fact that the high conductivity of two-dimensional laminated transition metal carbides/ nitrides (MXenes) contributes to the outstanding electromagnetic interference (EMI) shielding by the reflection of electromagnetic waves (EWs), it is difficulty to improve EMI shielding by pursuing higher conductivity due to the limitation of intrinsic properties. Here, we achieve superior EMI shielding by introducing the absorption of EWs in MXenes with micro-sized wrinkles which are induced by abundant Ti vacancies under chemical etching. The shielding effectiveness is up to 107 dB at a thickness of 20 μm. Combining with atomicscale structure observation and the first-principles calculations, it is concluded that the promotion of EMI shielding originates from the resonant absorption of formed electric dipoles induced by the asymmetrical distribution of charge densities near Ti vacancies. Our results could open a new vista for developing twodimensional EMI shielding materials.
Despite the fact that the high conductivity of two-dimensional laminated transition metal carbides/ nitrides (MXenes) contributes to the outstanding electromagnetic interference (EMI) shielding by the reflection of electromagnetic waves (EWs), it is difficulty to improve EMI shielding by pursuing higher conductivity due to the limitation of intrinsic properties. Here, we achieve superior EMI shielding by introducing the absorption of EWs in MXenes with micro-sized wrinkles which are induced by abundant Ti vacancies under chemical etching. The shielding effectiveness is up to 107 dB at a thickness of 20 μm. Combining with atomicscale structure observation and the first-principles calculations, it is concluded that the promotion of EMI shielding originates from the resonant absorption of formed electric dipoles induced by the asymmetrical distribution of charge densities near Ti vacancies. Our results could open a new vista for developing twodimensional EMI shielding materials.
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