2D Transition Metal Carbides and Nitrides (MXenes)
Location: EB1 Room 1011
Friday, February 10th 2017 - 11:00 am
Two-dimensional (2D) solids are the thinnest known materials in the universe. In the 12 years since the successful isolation of graphene (one-atom thick sheet of carbon), a variety of 2D materials have been discovered and characterized, such as borophene, phosphorene, boron nitride, and transition metal dichalcogenides (TMDs). One of the latest additions to the 2D world is a quite large family of 2D transition metal carbides and nitrides (called MXenes), with a formula of Mn+1 Xn (M is a transition metal, and X is carbon or nitrogen, n=1-3). Only five years after their first discovery, more than 20 different MXenes have been synthesized (for example, Ti2C, V2C, Nb2C, Ta4C3 , Mo2C, Mo2TiC2). The structures and properties of more than fifty MXenes have been theoretically predicted by density functional theory, showing they can be metallic or semiconducting depending on their chemistry.
MXenes reported to date have surface terminations, such as hydroxyl, oxygen or fluorine, which impart hydrophilicity to their surfaces. The availability of solid solutions, control of surface terminations, and a recent discovery of multi-transition- metal layered MXenes offers the potential for synthesis of many new structures. MXenes' versatile chemistry renders their properties tunable for applications including energy storage, electromagnetic interference shielding, reinforcement for composites, water purification, bio- and gas-sensors, lubrication, and chemical, photo- and electro-catalysis. Attractive electronic, optical, plasmonic and thermoelectric properties have also been shown.
Babak Anasori is currently a Research Assistant Professor in the Department of Materials Science and Engineering and the A.J. Drexel Nanomaterials Institute at Drexel University. He received his B.S. and M.S. from Sharif University and University of Tehran in Iran and completed his PhD at Drexel University in 2014, all in Materials Science and Engineering. His current research focuses on synthesis and characterizations of novel 2D materials and their composites, as well as study of MXenes in energy storage, electronics and biomedical applications. He has co-authored over 45 refereed publications and has received several national and international awards for his research and artistic way of presenting science including NSF/Science Visualization Challenge in 2011 and 2013, Diamond ranking in ACerS Graduate Excellence in Materials Science (GEMS) in 2012 and Materials Research Society (MRS) Postdoctoral Award in 2016.