Multiscale Co‐Construction of MXene/SiCnw Membrane Featuring Bicapacitor Architecture for Flexible, Stretchable, and Electromagnetic Interference Shielding Applications

The challenge of electromagnetic interference (EMI) in flexible foldable devices has become an increasingly pressing issue demanding resolution. Traditional EMI shielding materials predominantly depend on the robust reflective capabilities of highly conductive. However, when these materials are employed in the context of highly integrated and miniaturized electronic devices, there exists an inherent risk of short‐circuiting. To overcome this dilemma, inspired by the structure of bamboo wall, a bicapacitor architecture comprising MXene as polar plates and SiC nanowire (SiCnw) network as a dielectric layer to develop EMI shielding membrane by multiscale co‐construction is proposed. The fabricated MXene/SiCnw membrane demonstrates a remarkable EMI shielding effectiveness of 65.8 dB at a thickness of≈60 µm. The electronic oscillation in the polar plate and the dipole polarization in the dielectric layer contribute to the coordination of strong surface reflection and high internal absorption. The maximum strain energy of the membrane can reach 30.1%, and its high strength and flexibility are integrated together due to its unique bicapacitor and 3D network structure. This material is suitable for high demand applications in the aerospace, electronic equipment, and military fields.