Liu Kun, Du Haishun, Liu Wei, Zhang Meng, Wang Yaxuan, Liu Huayu, Zhang Xinyu, Xu Ting, Si Chuanling
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin 300457, China.
Department of Chemical Engineering, Auburn University, Auburn, AL-36849, USA.
Nanoscale. 2022 Oct 21;14(40):14902-14912. doi: 10.1039/d2nr00468b.
Flexible and light weight electromagnetic interference (EMI) shielding materials with high electromagnetic shielding efficiency (SE) and excellent mechanical strength are highly demanded for wearable and portable electronics. In this work, for the first time, a freestanding and flexible cellulose nanofibril (CNF)/PEDOT:PSS/MXene (TiCT) nanocomposite film with a ternary heterostructure was manufactured using a vacuum-assisted filtration process. The results show that compared with pure MXene films, the tensile strength of the optimized nanocomposite film increases from 8.88 MPa to 59.99 MPa, and the corresponding fracture strain increases from 0.87% to 4.60%. Intriguingly, the optimized nanocomposite film exhibited an impressive conductivity of 1903.2 S cm, which is among the highest values reported for MXene and cellulose-based nanocomposites. Owing to the superior conductivity and unique heterostructure, the nanocomposite film exhibits a high EMI SE value of 76.99 dB at a thickness of only 58.0 μm. Taking into account the robust mechanical properties and remarkable EMI shielding performance, the CNF/PEDOT:PSS/MXene nanocomposite film could be a prospective EMI shielding material for a variety of high-end applications.
具有高电磁屏蔽效率（SE）和优异机械强度的柔性轻质电磁干扰（EMI）屏蔽材料在可穿戴和便携式电子产品中具有很高的需求。在这项工作中，首次使用真空辅助过滤工艺制备了具有三元异质结构的独立且柔性的纤维素纳米纤丝（CNF）/聚（3,4-乙撑二氧噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）/碳化钛铝（TiCT）纳米复合薄膜。结果表明，与纯MXene薄膜相比，优化后的纳米复合薄膜的拉伸强度从8.88 MPa提高到59.99 MPa，相应的断裂应变从0.87%提高到4.60%。有趣的是，优化后的纳米复合薄膜表现出令人印象深刻的1903.2 S cm的电导率，这是报道的MXene和纤维素基纳米复合材料的最高值之一。由于其优异的导电性和独特的异质结构，该纳米复合薄膜在仅58.0 μm的厚度下就表现出76.99 dB的高EMI SE值。考虑到其强大的机械性能和卓越的EMI屏蔽性能，CNF/PEDOT:PSS/MXene纳米复合薄膜可能是用于各种高端应用的一种有前景的EMI屏蔽材料。
