Cao Wen-Tao, Chen Fei-Fei, Zhu Ying-Jie, Zhang Yong-Gang, Jiang Ying-Ying, Ma Ming-Guo, Chen Feng
Engineering Research Center of Forestry Biomass Materials and Bioenergy, Beijing Key Laboratory of Lignocellulosic Chemistry, College of Materials Science and Technology , Beijing Forestry University , Beijing 100083 , P.R. China.
State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics , Chinese Academy of Sciences , Shanghai 200050 , P.R. China.
ACS Nano. 2018 May 22;12(5):4583-4593. doi: 10.1021/acsnano.8b00997. Epub 2018 May 3.
With the growing popularity of electrical communication equipment, high-performance electromagnetic interference (EMI) shielding materials are widely used to deal with radiation pollution. However, the large thickness and poor mechanical properties of many EMI shielding materials usually limit their applications. In this study, ultrathin and highly flexible TiCT (d-TiCT , MXene)/cellulose nanofiber (CNF) composite paper with a nacre-like lamellar structure is fabricated via a vacuum-filtration-induced self-assembly process. By the interaction between one-dimensional (1D) CNFs and two-dimensional (2D) d-TiCT MXene, the binary strengthening and toughening of the nacre-like d-TiCT /CNF composite paper has been successfully achieved, leading to high tensile strength (up to 135.4 MPa) and fracture strain (up to 16.7%), as well as excellent folding endurance (up to 14 260 times). Moreover, the d-TiCT /CNF composite paper exhibits high electrical conductivity (up to 739.4 S m) and excellent specific EMI shielding efficiency (up to 2647 dB cm g) at an ultrathin thickness (minimum thickness 47 μm). The nacre-inspired strategy in this study offers a promising approach for the design and preparation of the strong integrated and flexible MXene/CNF composite paper, which may be applied in various fields such as flexible wearable devices, weapon equipment, and robot joints.
随着电气通信设备的日益普及，高性能电磁干扰（EMI）屏蔽材料被广泛用于应对辐射污染。然而，许多EMI屏蔽材料的厚度较大且机械性能较差，这通常限制了它们的应用。在本研究中，通过真空过滤诱导自组装过程制备了具有类似珍珠层状结构的超薄且高度柔性的TiCT （d-TiCT ，MXene）/纤维素纳米纤维（CNF）复合纸。通过一维（1D）CNF与二维（2D）d-TiCT MXene之间的相互作用，成功实现了类似珍珠层状的d-TiCT /CNF复合纸的二元强化和增韧，从而导致高拉伸强度（高达135.4 MPa）和断裂应变（高达16.7%），以及出色的耐折叠性（高达14260次）。此外，d-TiCT /CNF复合纸在超薄厚度（最小厚度47μm）下表现出高电导率（高达739.4 S m）和优异的比EMI屏蔽效率（高达2647 dB cm g）。本研究中受珍珠层启发的策略为设计和制备坚固、集成且柔性的MXene/CNF复合纸提供了一种有前景的方法，该复合纸可应用于各种领域，如柔性可穿戴设备、武器装备和机器人关节。
