Understanding Chemistry of 2D Transition Metal Carbides and Carbonitrides (MXenes) to Prolong Stability

A large family of two-dimensional transition metal carbides and nitrides (MXenes) raises interest for many applications due to their high electrical conductivity, mechanical properties [1], potentially tunable electronic structure [2], nonlinear optical properties [3], and the ability to be manufactured in the thin film state [4]. However, their chemistry that is key to development of these applications, still remains poorly understood [5,6]. In this presentation we will discuss recent progress in understanding fundamental MXene chemistry and harnessing it for suppressing unwanted reactions and prolonging stability of these materials.<br/>For example, suppressing oxidation and hydrolysis at high pH was demonstrated as an effective way to prolong shelf-life and stability of MXene aqueous colloids [7].<br/>Other selected examples illustrating connections between understanding MXene chemistry and development of their applications will also be considered.<br/> <br/><b>References</b><br/>1. Y. Li, S. Huang, C. Wei, C. Wu, V. N. Mochalin, <b>Nature Communications</b>, 10, 3014 (2019)<br/>2. M. Naguib, V. N. Mochalin, M. W. Barsoum, Y. Gogotsi, <b>Advanced Materials</b>, 26(7), 992-1005 (2014)<br/>3. J. Yi, L. Du, J. Li, L. Yang, L. Hu, S. Huang, Y. Dong, L. Miao, S. Wen, V. N. Mochalin, et al., <b>2D Materials</b>, 6, 045038 (2019)<br/>4. Y. Dong, S. Chertopalov, K. Maleski, B. Anasori, L. Hu, S. Bhattacharya, A. M. Rao, Y. Gogotsi, V. N. Mochalin, R. Podila, <b>Advanced Materials</b>, 30(10), 1705714 (2018)<br/>5. S. Huang, V. N. Mochalin, <b>Inorganic Chemistry</b>, 58(3), 1958 (2019)<br/>6. S. Huang, V. N. Mochalin, <b>ACS Nano</b> 14(8), 10251-10257 (2020)<br/>7. S. Huang, V. N. Mochalin, Combination of High pH and Antioxidant Improves Chemical Stability of Two-Dimensional Transition Metal Carbides and Carbonitrides (MXenes) in Aqueous Colloidal Solutions, <b>Inorganic Chemistry</b>, (2022 in press)