Seyedin Shayan, Zhang Jizhen, Usman Ken Aldren S, Qin Si, Glushenkov Alexey M, Yanza Elliard Roswell S, Jones Robert T, Razal Joselito M
Institute for Frontier Materials Deakin University Geelong VIC 3216 Australia.
Research School of Chemistry The Australian National University Canberra ACT 2601 Australia.
Glob Chall. 2019 Jul 15;3(10):1900037. doi: 10.1002/gch2.201900037. eCollection 2019 Oct.
2D transition metal carbides and nitrides called "MXene" are recent exciting additions to the 2D nanomaterials family. The high electrical conductivity, specific capacitance, and hydrophilic nature of MXenes rival many other 2D nanosheets and have made MXenes excellent candidates for diverse applications including energy storage, electromagnetic shielding, water purification, and photocatalysis. However, MXene nanosheets degrade relatively quickly in the presence of water and oxygen, imposing great processing challenges for various applications. Here, a facile solvent exchange (SE) processing route is introduced to produce nonoxidized and highly delaminated TiCT MXene dispersions. A wide range of organic solvents including methanol, ethanol, isopropanol, butanol, acetone, dimethylformamide, dimethyl sulfoxide, chloroform, dichloromethane, toluene, and -hexane is used. Compared to known processing approaches, the SE approach is straightforward, sonication-free, and highly versatile as multiple solvent transfers can be carried out in sequence to yield MXene in a wide range of solvents. Conductive MXene polymer composite fibers are achieved by using MXene processed via the solvent exchange (SE) approach, while the traditional redispersion approach has proven ineffective for fiber processing. This study offers a new processing route for the development of novel MXene-based architectures, devices, and applications.
被称为“MXene”的二维过渡金属碳化物和氮化物是二维纳米材料家族中最近令人兴奋的新成员。MXene的高电导率、比电容和亲水性可与许多其他二维纳米片相媲美，使其成为包括能量存储、电磁屏蔽、水净化和光催化在内的各种应用的理想候选材料。然而，MXene纳米片在水和氧气存在下相对较快地降解，给各种应用带来了巨大的加工挑战。在此，引入了一种简便的溶剂交换（SE）加工路线，以制备未氧化且高度分层的TiCT MXene分散体。使用了多种有机溶剂，包括甲醇、乙醇、异丙醇、丁醇、丙酮、二甲基甲酰胺、二甲基亚砜、氯仿、二氯甲烷、甲苯和己烷。与已知的加工方法相比，SE方法简单直接、无需超声处理且通用性强，因为可以依次进行多次溶剂转移，从而在多种溶剂中制备出MXene。通过使用经溶剂交换（SE）方法加工的MXene可实现导电的MXene聚合物复合纤维，而传统的再分散方法已被证明对纤维加工无效。本研究为开发新型基于MXene的结构、器件和应用提供了一条新的加工路线。
