Multifunctional ionic bonding-strengthened (Ti3C2Tx MXene/CNF)-(BNNS/CNF) composite films with Janus structure for outstanding electromagnetic interference shielding and thermal management

doi:10.1016/j.jmst.2024.11.010

Abstract

Abstract: Flexible multifunctional polymer-based electromagnetic interference (EMI) shielding composite films play a pivotal role in 5 G communication technology, smart wearables, automotive electronics, and aerospace. In this work, (Ti₃C₂T_x MXene/cellulose nanofibers (CNF)-(hydroxy-functionalized BNNS (BNNS-OH)/CNF) composite films (TBCF) with Janus structure are prepared via vacuum-assisted filtration of BNNS-OH/CNF and Ti₃C₂T_x/CNF suspension by one after another. Then ionic bonding-strengthened TBCF (ITBCF) is obtained by Ca²⁺ ion infiltration and cold-pressing technique. The Janus structure endows ITBCF with the unique “conductive on one side and insulating on the other” property. When the mass ratio of Ti₃C₂T_x and BNNS is 1:1 and the total mass fraction is 70 wt.%, the electrical conductivity (σ) of the Ti₃C₂T_x/CNF side of ITBCF reaches 166.7 S/cm, while the surface resistivity of the BNNS-OH/CNF side is as high as 304 MΩ. After Ca²⁺ ion infiltration, the mechanical properties of ITBCF are significantly enhanced. The tensile strength and modulus of ITBCF are 73.5 MPa and 15.6 GPa, which are increased by 75.9% and 46.2% compared with those of TBCF, respectively. Moreover, ITBCF exhibits outstanding EMI shielding effectiveness (SE) of 57 dB and thermal conductivity (λ) of 9.49 W/(m K). In addition, ITBCF also presents excellent photothermal and photoelectric energy conversion performance. Under simulated solar irradiation with a power density of 120 mW/cm², the surface stabilization temperature reaches up to 65.3 °C and the maximum steady state voltage reaches up to 58.2 mV.

Key words: Electromagnetic interference shielding, MXene, Janus structure, Thermal management, Photothermal conversion performance

Lei Wang, Li Lang, Xiaofeng Hu, Tiantian Gao, Mukun He, Hua Qiu, Xiaohui Ji, Hua Guo, Yali Zhang, Shan Huang. Multifunctional ionic bonding-strengthened (Ti₃C₂T_x MXene/CNF)-(BNNS/CNF) composite films with Janus structure for outstanding electromagnetic interference shielding and thermal management[J]. J. Mater. Sci. Technol., 2025, 224: 46-55.

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Multifunctional ionic bonding-strengthened (Ti₃C₂T_x MXene/CNF)-(BNNS/CNF) composite films with Janus structure for outstanding electromagnetic interference shielding and thermal management

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