Synthesis of Mo 4 VAlC 4 MAX Phase and Two-Dimensional Mo 4 VC 4 MXene with Five Atomic Layers of Transition Metals

MXenes are a family of two-dimensional (2D) transition metal carbides, nitrides, and carbonitrides with a general formula of Mn+1XnTx, in which two, three, or four atomic layers of a transition metal (M: Ti, Nb, V, Cr, Mo, Ta, etc.) are interleaved with layers of C and/or N (shown as X), and Tx represents surface termination groups such as −OH, ═O, and −F. Here, we report the scalable synthesis and characterization of a MXene with five atomic layers of transition metals (Mo4VC4Tx), by synthesizing its Mo4VAlC4 MAX phase precursor that contains no other MAX phase impurities. These phases display twinning at their central M layers which is not present in any other known MAX phases or MXenes. Transmission…

• NS
  National Science Foundation

  Awards: 1720530, 1542153, DMR-1720530, NNCI-1542153, DE-SC0012704
• UD
  U.S. Department of Defense

  Awards: DE-SC0012704, SC0012704
• UD
  U.S. Department of Energy

  Awards: SC0012704, DE-SC0018618, DE-SC0012573
• UO
  University of Pennsylvania

  Awards: 1720530, NNCI-1542153, DMR-1720530
• DU
  Drexel University
• OO
  Office of Science

  Awards: DE-SC0018618, SC0012704, DE-SC0012573, DE-SC0012704
• MR
  Materials Research Science and Engineering Center, Harvard University

  Awards: NNCI-1542153, DMR-1720530
• ND
  National Defense Science and Engineering Graduate
• DO
  Division of Materials Research

  Awards: DMR-1720530, 1720530
• BE
  Basic Energy Sciences

  Awards: DE-SC0018618, -SC0012573, DE-SC0012704, DE-SC0012573, SC0012704
• BN
  Brookhaven National Laboratory

  Awards: SC0012704, DE-SC0012573