An Electric‐Magnetic Dual‐Gradient Composite Film Comprising MXene, Hollow Fe3O4, and Bacterial Cellulose for High‐Performance EMI Shielding and Infrared Camouflage

• DOI: 10.1002/adfm.202419077
• Publication Date: 2025-01-15T09:38:16Z
• Authors: Mengxin Liu; Haoran Zhang; Xinmeng Huang; Ziyi Zhang; Kunlai Zhang; Zhenwu Chen; Jintang Zhou; Lei Pan
• Keywords: Camouflage; MXenes; Bacterial Cellulose; Filler (materials)

Abstract It is crucial to develop electromagnetic interference (EMI) shielding materials with high efficiency (SE) and reduced reflection mitigate the secondary pollution caused by waves (EMWs). Herein, a novel multilayer assembly strategy inspired structure of “Turkish dessert—Baklava” proposed introduce magnetic hollow Fe 3 O 4 nanospheres (HFO) conductive MXene nanosheets into bacterial cellulose (BC) network. Through layer‐by‐layer vacuum filtration approach, composite BC/MXene/HFO film controllable electric‐magnetic dual‐gradient achieved. The construction dual gradients alleviates impedance mismatch at air‐film interface, resulting in reflectivity toward EMWs, while unique HFO facilitates “absorption–reflection–reabsorption” process EMWs. Consequently, as‐prepared (0.35 mm thickness) exhibits an extraordinary EMI SE 67.6 dB as low 5.1 dB. Furthermore, it also demonstrates exceptional mechanical properties, efficient thermal management, Joule heating capabilities, well remarkable passive active infrared camouflage performances. This study offers innovative approach achieve less more absorption expands application scope precision electronics, aerospace, military equipment fields.