|About this Abstract
||Materials Science & Technology 2012
||Nanomaterials and Nanodevices
||MXenes - A New Family of Two Dimensional Materials Transition Metal Carbides Produced by Exfoliation of MAX Phases
||Michael Naguib, Olha Mashtalir, Joshua Carle, Murat Kurtoglu, Volker Presser, Jun Lu, Lars Lars Hultman, Yury Gogotsi, Michel W. Barsoum
|On-Site Speaker (Planned)
Herein we report on the fabrication of a new family of two-dimensional, 2-D, M<SUB>n+1</SUB>X<SUB>n</SUB> sheets produced by the exfoliation of the MAX phases; the latter are layered carbides and nitride, where “M” is an early transition metal, “A” is A-group 13-16 element and “X” is C and/or N. The exfoliation process was carried out by selective etching of “A” layers from the MAX phases using HF at room temperature. We labeled the resultant 2-D layers “MXene” to highlight their similarity to graphene. Several examples and preliminary properties for Ti<SUB>2</SUB> C, Nb<SUB>2</SUB>C, TiNbC, Ti<SUB>3</SUB>C<SUB>2</SUB>, Ti<SUB>3</SUB>CN, and Ta<SUB>4</SUB>C<SUB>3</SUB> are presented. Theory predicts that band gaps of these 2-D solids can be tuned by varying surface terminations rendering it either semiconductor or metallic. Since there are over 60 MAX phases known to date, this discovery opens the door to the synthesis of a large number of other 2-D transition metal carbides and nitrides.