Numerous compounds, ranging from clays to boron nitride (BN) and transition metal dichalcogenides, have been produced as 2D sheets. Although many of these materials remain subjects of purely academic interest, others have jumped into the limelight due to their attractive properties, which have led to practical applications. Among the latter are carbides and nitrides of transition metals known as MXenes (pronounced “maxenes”), a fast-growing family of 2D materials. The family of 2D transition metal carbides and nitrides (MXenes) has been expanding rapidly since the discovery of Ti3C2 at Drexel University in 2011. More than 30 different MXenes have been reported, and the structure and properties of numerous other MXenes have been predicted using density functional theory (DFT) calculations. Moreover, the availability of solid solutions on M and X sites, control of surface terminations, and the discovery of ordered double-M MXenes, such as out-of-plane ordered o-MXenes (e.g., Mo2TiC2) and in-plane ordered i-MXenes (e.g., Mo1.33C), offer the potential for producing dozens of new distinct structures. This presentation will describe the state of the art in the field. The manufacturing of MXenes, their delamination into single-layer 2D flakes and assembly into films, fibers and 3D structures will be briefly covered. Synthesis-structure-properties relations of MXenes will be addressed on the example of Ti3C2. The use of MXenes in ceramic- metal- and polymer-matrix composites, smart fibers and textiles will also be discussed. The versatile chemistry of the MXene family renders their properties tunable for a large variety of applications. Oxygen or hydroxyl-terminated MXenes, 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. This, among many other advantageous properties, makes the MXene family promising for energy storage and related electrochemical applications, but applications in plasmonics, electrocatalysis, biosensors, electronics, water purification/ desalination and other fields are equally exciting.
Short Bio: Prof. 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, metallurgy) and PhD (1986, physical chemistry) from Kiev Polytechnic and a DSc degree from the Ukrainian Academy of Sciences in 1995. His research group works on 2D carbides and nitrides (MXenes), nanostructured carbons, and other nanomaterials for energy, water and biomedical applications. He has co-authored 2 books, more than 700 papers in peer-reviewed journals and edited 14 books. He is recognized as a Highly Cited Researcher in Chemistry and Materials Science, and a Citations Laureate by Clarivate Analytics.
He has received numerous awards for his research including the ACS Award in the Chemistry of Materials, ACS Philadelphia Section Award, International Nanotechnology Prize (RUSNANOPrize), Ceramic Prize from the World Academy of Ceramics, European Carbon Association Award, S. Somiya Award from the International Union of Materials Research Societies, Nano Energy award from Elsevier, R&D 100 Award from R&D Magazine (twice) and two Nano 50 Awards from NASA Nanotech Briefs. He has been elected a Fellow of the American Association for Advancement of Science (AAAS), Materials Research Society, American Ceramic Society, the Electrochemical Society, the International Society of Electrochemistry, Royal Society of Chemistry, the World Academy of Ceramics and the European Academy of Sciences. He also served on the MRS Board of Directors, serves on editorial boards of more than a dozen of journals and is acting as Associate Editor of ACS Nano.