A scanning electron microscopy image reveals the beautiful shapes of tiny structures known as MXenes, which are of interest to scientists for new devices and electronics but were previously hard to create. These were grown with a new easier and less toxic method invented by chemists with the University of Chicago. For reference, the diameter of a human hair is about 50 µm.Image by Di Wang
MXenesへのダイレクトでクリーンなルートスケーラブルな新手法で2次元炭化物・窒化物材料を合成 A direct and clean route to MXenes. New, scalable methods synthesize two-dimensional carbide and nitride materials
Daniel D. Robertson and Sarah H. Tolbert
Science Published:23 Mar 2023
Materials with layered crystal structures are an emerging class of compounds with desirable properties for numerous applications. In particular, the family of two-dimensional (2D) transition-metal carbides and nitrides (1) known as MXenes [where M is a transition metal and X is carbon (C) or nitrogen (N)] have shown exciting prospects for use in energy storage (2), electromagnetic interference shielding (3), transparent conductors (4), and more (5, 6). However, MXenes have only been synthesized from MAX phases [where A is typically aluminum (Al) but can sometimes be other elements] by chemically removing A atoms with harsh solutions (7). Because this method generates large amounts of waste, it limits the scale of manufacturing for MXenes and hinders their utility. On page 1242 of this issue, Wang et al. (8) report the direct synthesis of MXenes by use of direct, scalable synthetic methods. These approaches also open pathways to produce new morphologies and phases of MXenes that have not been accessible by the typical route.