Covalent surface modifications and superconductivity of two-dimensional metal carbide MXenes

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  • Vladislav Kamysbayev
    Department of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
  • Alexander S. Filatov
    Department of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
  • Huicheng Hu
    Department of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
  • Xue Rui
    Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USA.
  • Francisco Lagunas
    Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USA.
  • Di Wang
    Department of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USA.
  • Robert F. Klie
    Department of Physics, University of Illinois at Chicago, Chicago, IL 60607, USA.
  • Dmitri V. Talapin
    Department of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USA.

Description

<jats:title>Modifying MXene surfaces</jats:title> <jats:p> Unlike graphene and transition-metal dichalcogenides, two-dimensional transition-metal carbides (MXenes) have many surface sites that can be chemically modified. Etching of the aluminum layer of a parent MAX phase Ti <jats:sub>3</jats:sub> AlC <jats:sub>2</jats:sub> layered material with hydrofluoric acid leads to the MXene Ti <jats:sub>3</jats:sub> C <jats:sub>2</jats:sub> with various surface terminations. Molten salts can achieve uniform chloride terminations, but these are difficult to further modify. Kamysbayev <jats:italic>et al.</jats:italic> show that etching of MAX phases in molten cadmium bromide leads to bromide-terminated MXenes that can then be substituted with oxygen, sulfur, selenium, tellurium, and NH groups as well as with vacancy sites. The surface groups can alter electronic transport. For example, the Nb <jats:sub>2</jats:sub> C MXenes exhibit surface group–dependent superconductivity. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6506" page="979" related-article-type="in-this-issue" vol="369" xlink:href="10.1126/science.aba8311">979</jats:related-article> </jats:p>

Journal

  • Science

    Science 369 (6506), 979-983, 2020-08-21

    American Association for the Advancement of Science (AAAS)

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