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

Keywords

MXenesCarbideMaterials scienceTransition metalMetalBromideInorganic chemistryEtching (microfabrication)Covalent bondExfoliation jointGrapheneLayer (electronics)ChemistryNanotechnologyComposite materialMetallurgyOrganic chemistry

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Publication Info

Year
2020
Type
article
Volume
369
Issue
6506
Pages
979-983
Citations
1478
Access
Closed

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Cite This

Vladislav Kamysbayev, Alexander S. Filatov, Huicheng Hu et al. (2020). Covalent surface modifications and superconductivity of two-dimensional metal carbide MXenes. Science , 369 (6506) , 979-983. https://doi.org/10.1126/science.aba8311

Identifiers

DOI
10.1126/science.aba8311
PMID
32616671

Data Quality

Data completeness: 81%