MXene/bacterial cellulose/FeO/methyltrimethoxylsilane flexible film with hydrophobic for effective electromagnetic shielding.

Electromagnetic (EM) pollution has become a serious problem in modern society as it affects human lives. The fabrication of strong and highly flexible materials for electromagnetic interference (EMI) shielding applications is extremely urgent. Herein, a MXene TiCT/FeO & bacterial cellulose (BC)/FeO&Methyltrimethoxysilane (MTMS) flexible hydrophobic electromagnetic shielding film (SBTF, X and Y were the number of layers of BC/FeO and the layers of TiCT/FeO), was fabricated. In the prepared film, MXene TiCT absorbs a large amount of radio waves through polarization relaxation and conduction loss. Because of its extremely low reflectance of electromagnetic waves, BC@FeO, as the outermost layer of the material, allows more electromagnetic waves to incident inside the material. The maximum electromagnetic interference (EMI) shielding efficiency (SE) of 68 dB was achieved for the composite film at 45 μm thickness. What's more, the SBTF films show excellent mechanical properties, hydrophobicity and flexibility. The unique stratified structure of the film provides a new strategy for designing high-performance EMI shielding films with excellent surface and mechanical properties.