Structural effects of AgNWs / MXene in artificial nacre‐Like hybrid cellulose nanofiber films on electromagnetic interference ( EMI ) shielding performance

Abstract The heterogeneous interface generally offers unique conductive behaviors in nacre‐like films. Reasonable interface and composition regulation are important to enhance EMI shielding performance when containing one and two dimensional nanofillers together. Herein, a series of flexible cellulose‐based EMI shielding nacre‐like films with different content of AgNWs and/or Ti 3 C 2 T x nanosheets were prepared by vacuum‐assisted filtration method. To explore their different interaction behaviors, three different nacre structures (mixed, double‐layered, and multilayered structure) are fully prepared. The comparison results show that the Ti 3 C 2 T x sheets are more advantageous to form a conductive path at a lower addition (<15%) than AgNWs. Surprisingly, the mixed structure leads to even lower SE T values due to the break of original compact conductive network and interface resistance enhancement. Particularly, the layered‐structure film obtains the synergistic effect. However, with increasing layer numbers, the SE T values reached the maximum at six layers (54.86 dB) and then dropped to 51.50 dB at eight layers, which is even lower than that of two layers (52.36 dB). Consequently, this work provided a detailed contrastive experimental process and discussion to obtain optimal EMI shielding films by adjusting composition and architecture. The interface coupling strategy may offer a useful path to guide the structural design. Highlights EMI shielding nacre‐like films were prepared with interface structure. Synergistic shielding effect of 1D AgNWs and 2D Ti 3 C 2 T x nanosheets. Mixed, double‐layered, and multilayered structural films were prepared. The layered structure exhibits superior EMI SE than mixed structure. Excessive layered structure leads to the degradation of EMI SE.