Berlin 2018 – wissenschaftliches Programm

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SYDM: Symposium 2D Materials

SYDM 1: 2D Materials

SYDM 1.5: Hauptvortrag

Donnerstag, 15. März 2018, 17:15–17:45, H 0105

A Progress Report on Electron Transport in MXenes; A New Family of 2D Materials — •Michel Barsoum — Department of Materials Science and Engineering, Drexel University, Philadelphia, USA

The 2D early transition metal carbides known as MXenes - obtained by etching the A-layers from the MAX phases, themselves layered, but strongly bonded solids - were discovered in 2011 and have generated substantial interest in the scientific community because of their potential in an ever expanding host of applications. Unlike hydrophobic graphene, MXenes are hydrophilic and behave as *conductive clays* a hitherto unknown combination. Along the same lines, because their density of states at the Fermi level is substantial, and the electric conductivity, for the most part, metal-like, MXenes can be considered as pseudo-2D metals, surface terminated by a combination of O, OH, and/or F. Said otherwise, they posses a metallic core with a hydroxide shell. It is for this reason that their proper chemical description is Mn+1XnTx, where T represents a surface termination and n = 1 to 3. In this talk, I will introduce MXenes and highlight what we currently know about their transport - which is in some cases, occurs by variable range hopping and/or thermal activation over a mobility edge - and their optical properties and how these properties relate to potential applications such as supercapacitor electrodes and electromagnetic interference shielding. The vast compositional, chemical and structural landscape that MXenes represents will be highlighted.