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. 2021 Aug 13;373(6556):801-805.
doi: 10.1126/science.abf6239.

Boridene: Two-dimensional Mo4/3B2-x with ordered metal vacancies obtained by chemical exfoliation

Jie Zhou  1   2 , Justinas Palisaitis  3 , Joseph Halim  3   2 , Martin Dahlqvist  3   2 , Quanzheng Tao  3   2 , Ingemar Persson  3   3 , Lars Hultman  3 , Per O Å Persson  3   3 , Johanna Rosen  4
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Boridene: Two-dimensional Mo4/3B2-x with ordered metal vacancies obtained by chemical exfoliation

Jie Zhou et al. Science. .

Abstract

Extensive research has been invested in two-dimensional (2D) materials, typically synthesized by exfoliation of van der Waals solids. One exception is MXenes, derived from the etching of constituent layers in transition metal carbides and nitrides. We report the experimental realization of boridene in the form of single-layer 2D molybdenum boride sheets with ordered metal vacancies, Mo4/3B2-xTz (where Tz is fluorine, oxygen, or hydroxide surface terminations), produced by selective etching of aluminum and yttrium or scandium atoms from 3D in-plane chemically ordered (Mo2/3Y1/3)2AlB2 and (Mo2/3Sc1/3)2AlB2 in aqueous hydrofluoric acid. The discovery of a 2D transition metal boride suggests a wealth of future 2D materials that can be obtained through the chemical exfoliation of laminated compounds.

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