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Two-dimensional Mo(1.33)C MXene with divacancy ordering prepared from parent 3D laminate with in-plane chemical ordering

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. H...

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Detalles Bibliográficos
Autores principales: Tao, Quanzheng, Dahlqvist, Martin, Lu, Jun, Kota, Sankalp, Meshkian, Rahele, Halim, Joseph, Palisaitis, Justinas, Hultman, Lars, Barsoum, Michel W., Persson, Per O.Å., Rosen, Johanna
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5413966/
https://www.ncbi.nlm.nih.gov/pubmed/28440271
http://dx.doi.org/10.1038/ncomms14949
Descripción
Sumario: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 material exhibits a 65% higher volumetric capacitance than its counterpart, Mo(2)C, with no vacancies, and one of the highest volumetric capacitance values ever reported, to the best of our knowledge. This structural design on the atomic scale may alter and expand the concept of property-tailoring of 2D materials.