Article

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

Vladislav KamysbayevDepartment of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USAAlexander S. FilatovDepartment of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USAHuicheng HuDepartment of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USARui XueDepartment of Physics, University of Illinois at Chicago, Chicago, IL 60607, USAFrancisco LagunasDepartment of Physics, University of Illinois at Chicago, Chicago, IL 60607, USADi WangDepartment of Chemistry and James Franck Institute, University of Chicago, Chicago, IL 60637, USARobert F. KlieDepartment of Physics, University of Illinois at Chicago, Chicago, IL 60607, USADmitri V. TalapinCenter for Nanoscale Materials, Argonne National Laboratory, Argonne, IL 60439, USA

2020en

ABI

Abstract

Modifying MXene surfaces 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 3 AlC 2 layered material with hydrofluoric acid leads to the MXene Ti 3 C 2 with various surface terminations. Molten salts can achieve uniform chloride terminations, but these are difficult to further modify. Kamysbayev et al. 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 2 C MXenes exhibit surface group–dependent superconductivity. Science , this issue p. 979

Identifiers

DOI: 10.1126/science.aba8311

Citations and references

Cited by 40 references

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