Huang Shuohan, Mochalin Vadym N
Department of Chemistry, Missouri University of Science & Technology, Rolla, Missouri 65409, United States.
Department of Materials Science & Engineering, Missouri University of Science & Technology, Rolla, Missouri 65409, United States.
ACS Nano. 2020 Aug 25;14(8):10251-10257. doi: 10.1021/acsnano.0c03602. Epub 2020 Jul 17.
MXenes, a large family of two-dimensional materials that are intensely investigated for a broad range of applications, are unstable in water, spontaneously forming TiO. Several hypotheses have been proposed recently to explain the transformations of MXenes in aqueous environments based on characterization of solid products and measurements of solution pH. However, no studies of the gaseous products of these reactions have been reported. In this work, we demonstrate the use of Raman spectroscopy and gas chromatography techniques to study the gaseous reaction products of TiC, TiC, TiCN, and NbC MXenes in aqueous environments. Based on the analysis of gases, the reactivities of MXenes with different monolayer thickness and chemical composition have been analyzed. We demonstrate the analysis of gases produced during MXene transformations as a powerful technique that can be used for better understanding of their nontrivial chemistry.
MXenes是一大类二维材料，因其广泛的应用而受到深入研究，但它们在水中不稳定，会自发形成TiO。最近基于固体产物的表征和溶液pH值的测量，提出了几种假说来解释MXenes在水环境中的转变。然而，尚未有关于这些反应气态产物的研究报道。在这项工作中，我们展示了使用拉曼光谱和气相色谱技术来研究TiC、TiC、TiCN和NbC MXenes在水环境中的气态反应产物。基于对气体的分析，分析了不同单层厚度和化学成分的MXenes的反应活性。我们证明了对MXene转变过程中产生的气体进行分析是一种强大的技术，可用于更好地理解其复杂的化学性质。
