Construction of Cellulose Nanofibrils-based Ternary Heterogeneous Film for Efficient Electromagnetic Interference Shielding

다국어 초록 (Multilingual Abstract)

In this work, flexible CNF/PEDOT:PSS/MXene ternary heterogeneous films with high conductivity and excellent mechanical properties were manufactured using a facile and versatile approach. The optimized CNF/PEDOT:PSS/MXene-50 ternary heterogeneous film (with a weight ratio of 5:5 of CNF/PEDOT:PSS to MXene) showed good flexibility, high tensile strength (59.99 MPa), and high electrical conductivity (1903.2 S cm-1). It was demonstrated that 1D CNF/PEDOT:PSS with a high aspect ratio could intertwine with the 2D MXene nanoflakes, forming a highly aligned microstructure, which imparted excellent flexibility and mechanical robustness to the final ternary heterogeneous films. PEDOT:PSS on the CNF surface served as a conductive coating which interacted with highly conductive MXene to form continuous pathways for electron transfer, endowing the ternary heterogeneous films with excellent conductivity. Due to the excellent conductivity and unique hetero-structure, the CNF/PEDOT:PSS/MXene ternary heterogeneous films have been proved to have an excellent EMI shielding properties (e.g., 76.99 dB at a thickness of 58.0 μm), which are superior to most of the previously reported results. All in all, a facile and sustainable strategy is provided in this work to produce high-performance EMI shielding materials, which are expected to be widely used in flexible and wearable electronic products, aviation and mobile devices.