Rheology-Guided Assembly of a Highly Aligned MXene/Cellulose Nanofiber Composite Film for High-Performance Electromagnetic Interference Shielding and Infrared Stealth
Rheology-Guided Assembly of a Highly Aligned MXene/Cellulose Nanofiber Composite Film for High-Performance Electromagnetic Interference Shielding and Infrared Stealth
复制标题
流变学引导组装高度对准的 MXene/纤维素纳米纤维复合薄膜，用于高性能电磁干扰屏蔽和红外隐形
DOI：
10.1021/acsami.2c11292
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发表时间：
2022-07-31
影响因子：
9.5
通讯作者：
Lu, Canhui
中科院分区：
文献类型：
--
作者：
Feng, Shiyi;Yi, Ya;Lu, Canhui
二维（2D）MXene纳米片的精细排列结构已经证明了对应用的积极影响，特别是在电磁干扰（EMI）屏蔽和红外（IR）隐身方面。然而，通过理论指导的求解过程来精确调节结构装配仍然是一个巨大的挑战。在本文中，具有高纵横比的一维（1D）纤维素纳米纤维（CNF）被用作MXene/CNF胶体的增强剂和流变改性剂，以制造用于EMI屏蔽和IR隐身的取向MXene基材料。值得注意的是，MXene/CNF胶体的系统流变学研究提出了确定最佳的解决方案，加工条件，精细定向组件的安排要求，并提供了深入的信息组件之间的相互作用。微CT和广角X射线衍射/小角X射线散射（WAXD/SAXS）结果表明，MXene/CNF薄膜具有良好的取向结构，其电导率为46685 S m（-1），拉伸强度为281.7MPa，杨氏模量为14.8GPa。此外，高取向结构的薄膜具有很大的提高EMI屏蔽效能（50.2分贝）和红外隐身（0.562发射率）。这些发现为高性能MXene基功能复合膜的溶液加工优化制备提供了富有成效的理解，并为多功能隐身材料的开发提供了巨大的机会。
Delicately aligned structures of two-dimensional (2D) MXene nanosheets have demonstrated positive effects on applications, especially in electromagnetic interference (EMI) shielding and infrared (IR) stealth. However, precise regulation of structural assembly by theory-guided solution processing is still a great challenge. Herein, one-dimensional (1D) cellulose nanofibers (CNFs) with a high aspect ratio are applied as a reinforcing agent and a rheological modifier for MXene/CNF colloids to fabricate aligned MXene-based materials for EMI shielding and IR stealth. Notably, a systematical rheological study of the MXene/CNF colloids is proposed to determine the optimal solution-processing conditions for finely oriented component arrangement requirements and provides in-depth information on the interactions between the components. The delicately regulated orientation structure assembled by shear inducement is convincingly demonstrated through micro-CT and wide-angle X-ray diffraction/small-angle X-ray scattering (WAXD/SAXS), which endows the MXene/CNF film with a significantly enhanced electrical conductivity of 46 685 S m(-1), a tensile strength of 281.7 MPa, and Young's modulus of 14.8 GPa. Furthermore, the highly aligned structure of the ultrathin film possesses a great enhancement in EMI shielding effectiveness (50.2 dB) and IR stealth (0.562 emissivity). These findings provide a fruitful understanding of the optimized fabrication in solution processing of high-performance MXene-based functional composite films and open up a great opportunity for the development of multifunctional stealth materials.