Fabrication of MXene based sandwich-like films for excellent flexibility, electromagnetic interference shielding and thermal management

The booming of modern communication and wearable electronics has greatly necessitated the development of films that could feature both electromagnetic interference shielding and thermal management capacity. Here we report a series of sandwich structured films prepared through freeze drying-laying-hot compression technology. Owing to the unique sandwich like structure, the resulting film has displayed not only EMI shielding performance (42 dB), but also enhanced absorption capacity (95 %). Meanwhile, strong anisotropic thermal conductive property that allows for satisfying in-plane thermal conductivity of 3.29 W m−1 K−1 was achieved. Benefiting from this, excellent electro-thermal conversion capacity that could enable fast de-icing under low voltage (4 V) was also acquired. Furthermore, those sandwich structured films possess sufficient flexibility to sustain repetitive bending, folding and shaping. Herein, this research has expanded the horizons in seeking both superior EMI shielding and heat dissipation capacity, which will further benefit the development of MXene‑based composites for high-performance electronic devices.