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Issue 28, 2016
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Novel Au- and Ge-based two-dimensional materials formed through topotactic transitions of AlB2-like structures

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Abstract

The topotactic reaction of a layered compound, for example CaGe2, with HCl solution is a common and facile method to produce two-dimensional (2D) materials. In this work we demonstrate with first-principles calculations that this technique can potentially lead to a whole new family of 2D materials starting from three-dimensional crystals with AlB2-like structures. As representative cases, we show here that the de-intercalation of Sc and Ca atoms from ScAuGe and Ca2AuGe3 crystals is strongly exothermic and produces the stable 2D monolayers AuGeH and AuGe3H3, respectively. Remarkably, both metals (AuGeH) and semiconductors (AuGe3H3) can be prepared by this method. Based on the broad availability of AlB2-like structures with varying stoichiometries, there are several possibilities to prepare novel functional 2D materials with suitable topotactic transitions.

Graphical abstract: Novel Au- and Ge-based two-dimensional materials formed through topotactic transitions of AlB2-like structures

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Publication details

The article was received on 07 May 2016, accepted on 18 Jun 2016 and first published on 23 Jun 2016


Article type: Communication
DOI: 10.1039/C6NR03698H
Citation: Nanoscale, 2016,8, 13558-13561

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    Novel Au- and Ge-based two-dimensional materials formed through topotactic transitions of AlB2-like structures

    L. Tsetseris, Nanoscale, 2016, 8, 13558
    DOI: 10.1039/C6NR03698H

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