With the rapid development of modern electronics, the next generation of electromagnetic interference (EMI) shielding materials requires ultrathin, lightweight, flexibility and robustness to protect electronic devices from radiation pollution. In this study, the multifunctional Ti₃C₂T_x/Bacterial Cellulose (Ti₃C₂T_x/BC) composite films with uniformly lamellar structures have been developed by combining experimental and theoretical works. The microstructures, mechanical properties, EMI shielding and photothermal conversion performances of Ti₃C₂T_x/BC composite films have been systematically investigated. It is highlighted that the resultant ultrathin and flexible Ti₃C₂T_x/BC composite film with a Ti₃C₂T_x content of 50 wt% exhibits satisfactory tensile strength of 109.6±4.5 MPa, excellent electrical conductivity of 5020 S m^-1 and EMI SE value of 43.7 dB. More interestingly, the composite film displays stable and fast-response photothermal characteristics, with the photothermal conversion temperature up to 74.5 ℃. This study proposes a versatile strategy to synthesize multifunctional MXene/BC composite films with satisfactory mechanical properties, high performance EMI shielding and photothermal conversion effects, which shows great potential for the protection of electronic devices.

随着现代电子技术的快速发展，下一代电磁干扰 (EMI) 屏蔽材料需要超薄、轻质、柔韧性和坚固性，以保护电子设备免受辐射污染。本研究结合实验和理论工作，开发了具有均匀层状结构的多功能Ti ₃ C ₂ T _x /细菌纤维素（Ti ₃ C ₂ T _{x /BC）复合薄膜。Ti 3} C ₂ T _x的显微组织、力学性能、EMI屏蔽和光热转换性能/BC 复合膜已被系统地研究。值得一提的是，所得到的Ti ₃ C ₂ T _{x含量为50 wt%的超薄柔性Ti 3} C ₂ T _x /BC复合薄膜表现出令人满意的109.6±4.5 MPa的拉伸强度，5020 S m ^-的优异导电率。¹和 43.7 dB 的 EMI SE 值。更有趣的是，复合薄膜表现出稳定且快速响应的光热特性，光热转换温度高达74.5 ℃。本研究提出了一种通用的策略来合成具有令人满意的机械性能、高性能 EMI 屏蔽和光热转换效果的多功能 MXene/BC 复合薄膜，这在保护电子器件方面显示出巨大的潜力。