Two-dimensional Mo1.33C MXene with divacancy ordering prepared from parent 3D laminate with in-plane chemical ordering

Quanzheng Tao, Martin Dahlqvist, Jun Lu, Sankalp Kota, Rahele Meshkian, Joseph Halim, Justinas Palisaitis, Lars Hultman, Michel W. Barsoum, Per O.Å. Persson and Johanna Rosen ()
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Quanzheng Tao: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Martin Dahlqvist: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Jun Lu: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Sankalp Kota: Drexel University, Philadelphia
Rahele Meshkian: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Joseph Halim: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Justinas Palisaitis: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Lars Hultman: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Michel W. Barsoum: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Per O.Å. Persson: Thin Film Physics, Chemistry and Biology (IFM), Linköping University
Johanna Rosen: Thin Film Physics, Chemistry and Biology (IFM), Linköping University

Nature Communications, 2017, vol. 8, issue 1, 1-7

Abstract: Abstract 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, (Mo2/3Sc1/3)2AlC, with in-plane chemical ordering, and by selectively etching the Al and Sc atoms, we show evidence for 2D Mo1.33C 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, Mo2C, 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.

Date: 2017
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DOI: 10.1038/ncomms14949

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