Two-dimensional Mo1.33C MXene with divacancy ordering prepared from parent 3D laminate with in-plane chemical ordering

Abstract The exploration of two-dimensional solids is an active area of materials discovery. Research in this area has given us structures spanning graphene to dichalcogenides, and more recently 2D transition metal carbides (MXenes). One of the challenges now is to master ordering within the atomic sheets. Herein, we present a top-down, high-yield, facile route for the controlled introduction of ordered divacancies in MXenes. By designing a parent 3D atomic laminate, (Mo 2/3 Sc 1/3 ) 2 AlC, with in-plane chemical ordering, and by selectively etching the Al and Sc atoms, we show evidence for 2D Mo 1.33 C sheets with ordered metal divacancies and high electrical conductivities. At ∼1,100 F cm −3 , this 2D…

• DU
  Drexel University
• SF
  Stiftelsen för Strategisk Forskning

  Award: KAW 2015.0043
• NS
  National Science Council
• V
  Vetenskapsrådet

  Awards: 2012-4425, 621-2012-4359, 621-2012-4425, 2013-8020, 642-2013-8020, 2008-405, 622-2008-405, 2012-4359
• NS
  National Supercomputer Centre, Linköpings Universitet