MXenes at the Frontier of the 2D Materials World

Yury Gogotsi Department of Materials Science and Engineering, and A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA 19104, USA E-mail: Gogotsi@drexel.edu

Abstract: The family of 2D Transition Metal carbides and nitrides (MXenes) has been expanding rapidly since the discovery of Ti3C2 in 2011[1]. Approximately 30 different MXenes have been synthesized, and the structure and properties of numerous other MXenes have been predicted using density functional theory (DFT) calculations [2]. Moreover, the availability of solid solutions on M and X sites, control of surface terminations, and the discovery of ordered double-M MXenes (e.g., Mo2TiC2) offer the potential for synthesis of dozens of new distinct structures. This presentation will describe the state-of-the-art in the synthesis of MXenes. Delamination into single-layer 2D flakes and assembly into films and 3D structures, as well as their properties will be discussed. Synthesis-Structure-Properties relations of MXenes will be addressed on the example of Ti3C2 and recently developed MXenes. The versatile chemistry of the MXene family renders their properties tunable for a large variety of applications[3]. Oxygen or hydroxyl- terminated Menes, such as Ti3C2O2, have been shown to have redox capable transition metals layers on the surface and offer a combination of high electronic conductivity with hydrophilicity, as well as fast ionic transport[4]. This, among many other advantageous properties, makes the material family promising candidates for energy storage and related electrochemical applications [5], but applications in plasmonics, electrocatalysis, biosensors, water purification/desalination and other fields are equally exciting. In particular, electromagnetic shielding and antenna applications of MXenes will be addressed

References: [1] M. Naguib, et al., Two-Dimensional Nanocrystals Produced by Exfoliation of Ti3AlC2, Advanced Materials, 23, 4248 (2011). [2] X. Xiao, H. Wang, P. Urbankowski, Y. Gogotsi, Topochemical Synthesis of 2D Materials, Chemical Society Reviews, 47 (23) 8744 - 8765 (2018). [3] B. Anasori, M. Lukatskaya, Y. Gogotsi, 2D Metal Carbides and Nitrides (MXenes) for Energy Storage, Nature Reviews Materials, 2, 16098 (2017). [4] K. Hantanasirisakul, Y. Gogotsi, Electronic and Optical Properties of 2D Transition Metal Carbides and Nitrides (MXenes), Advanced Materials, 30 (52) 1804779 (2018). [5] X. Wang, et al, Solvents` influence on charge storage in titanium carbide MXene, Nature Energy, 4, 241–248 (2019). Biography: Dr. Yury Gogotsi is Distinguished University Professor and Charles T. and Ruth M. Bach Professor of Materials Science and Engineering at Drexel University. He also serves as Director of the A.J. Drexel Nanomaterials Institute. He received his MS (1984) and PhD (1986) from Kiev Polytechnic and a DSc degree from the Ukrainian Academy of Sciences in 1995. His research group works on 2D carbides, nanostructured carbons, and other nanomaterials for energy, water and biomedical applications. He is recognized as Highly Cited Researcher and Citations Laureate by ThomsonReuters/Clarivate Analytics (h-index exceeding 100). He has received numerous awards for his research including the European Carbon Association Award, S. Somiya Award from the International Union of Materials Research Societies, Nano Energy award from Elsevier, International Nanotechnology Prize (RUSNANOPrize), R&D 100 Award from R&D Magazine (twice). He has been elected a Fellow of the American Association for Advancement of Science (AAAS), Materials Research Society, American Ceramic Society, the Electrochemical Society, International Society of Electrochemistry, Royal Society of Chemistry, NanoSMAT Society, as well as Academician of the World Academy of Ceramics and Fellow of the European Academy of Sciences. He also served on the MRS Board of Directors and is acting as Associate Editor of ACS Nano