Downes Marley, Shuck Christopher E, Lord Robert W, Anayee Mark, Shekhirev Mikhail, Wang Ruocun John, Hryhorchuk Tetiana, Dahlqvist Martin, Rosen Johanna, Gogotsi Yury
Department of Materials Science and Engineering and A.J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, Pennsylvania 19104, United States.
Materials Design Division, Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden.
ACS Nano. 2023 Sep 12;17(17):17158-17168. doi: 10.1021/acsnano.3c04967. Epub 2023 Aug 31.
MXenes are two-dimensional (2D) transition metal carbides, nitrides, and carbonitrides typically synthesized from layered MAX-phase precursors. With over 50 experimentally reported MXenes and a near-infinite number of possible chemistries, MXenes make up the fastest-growing family of 2D materials. They offer a wide range of properties, which can be altered by their chemistry (M, X) and the number of metal layers in the structure, ranging from two in MXT to five in MXT. Only one MX MXene, MoVC, has been reported. Herein, we report the synthesis and characterization of two MAX mixed transition metal MAX phases, TiTaAlC and TiNbAlC, and their successful topochemical transformation into TiTaCT and TiNbCT MXenes. The resulting MXenes were delaminated into single-layer flakes, analyzed structurally, and characterized for their thermal and optical properties. This establishes a family of MAX MAX phases and their corresponding MXenes. These materials were experimentally produced based on guidance from theoretical predictions, leading to more exciting applications for MXenes.
MXenes是二维（2D）过渡金属碳化物、氮化物和碳氮化物，通常由层状MAX相前驱体合成。有超过50种已通过实验报道的MXenes以及近乎无限数量的可能化学组成，MXenes构成了二维材料中增长最快的家族。它们具有广泛的性能，这些性能可通过其化学组成（M、X）以及结构中的金属层数来改变，范围从MXT中的两层到MXT中的五层。仅报道了一种MX MXene，即MoVC。在此，我们报道了两种MAX混合过渡金属MAX相TiTaAlC和TiNbAlC的合成与表征，以及它们成功地通过拓扑化学转化为TiTaCT和TiNbCT MXenes。所得的MXenes被剥离成单层薄片，进行结构分析，并对其热性能和光学性能进行表征。这建立了一个MAX MAX相及其相应MXenes的家族。这些材料是根据理论预测的指导通过实验制备的，从而为MXenes带来了更令人兴奋的应用。
