Heterogeneous films assembled from Ti3C2Tx MXene and porous double-layered carbon nanosheets for high-performance electromagnetic interference shielding

Two-dimensional (2D) materials with ideal flexibility, lightweight, and high electrical conductivity can serve as ideal candidates for electromagnetic interference (EMI) shielding in next-generation portable and wearable electronic devices. However, the constrain in physical properties of homogeneous 2D material limits their potential for achieving high-performance EMI shielding in most demanding devices. Combining different 2D materials into highly engineered composites can effectively overcome the limitations of individual 2D materials by capitalizing on the additive effect of the merits possessed by multiple types of 2D materials. Here, 2D porous double-layered carbon nanosheets are prepared and assembled with Ti3C2Tx MXene to form heterogeneous films with a layered structure. The heterogeneous films present desirable multi-functions including high conductivity, controllable thickness, and high stability. The heterogeneous film containing 10 wt% of porous double-layered carbon nanosheets shows the highest EMI shielding effectiveness of 52.8 dB, and the specific shielding effectiveness of 33143 dB cm(2) g(-1), which is mainly attributed to the unique porous layer-by-layer architecture and the resultant enhancement in the absorption of electromagnetic wave. Moreover, the heterogeneous film exhibits remarkable environmental stability, fueled by decreased hydrophilicity. This heterogeneous architecture could pave a new way for addressing the next-generation challenges of EMI shielding.