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Stability and universal encapsulation of epitaxial Xenes

Abstract

In the realm of two-dimensional materials framework, single-element graphene-like lattices, known as Xenes, pose several issues concerning their environmental stability with implication in their use for technology transfer to a device layout. In this Discussion, we scrutinize the chemical reactivity of epitaxial silicene, taken as a case in point, in oxygen-rich environments. Oxidation of silicene is detailed by means of a photoemission spectroscopy study upon carefully dosing molecular oxygen in vacuum and subsequent exposure to ambient conditions, showing different chemical reactivity. We therefore propose a sequential Al2O3 encapsulation of silicene as a solution to face degradation proving effectiveness by virtue of the interaction between silicene and silver substrate. Based on this direction, we generalize our encapsulation scheme to a large number of metal-suported Xenes by taking the case of epitaxial phosphorene-on-gold into account.

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Article information


Submitted
14 Nov 2019
Accepted
23 Dec 2019
First published
30 Dec 2019

Faraday Discuss., 2020, Accepted Manuscript
Article type
Paper

Stability and universal encapsulation of epitaxial Xenes

A. Molle, G. Faraone, A. Lamperti, D. Chiappe, E. Cinquanta, C. Martella, . E. Bonera , E. Scalise and C. Grazianetti, Faraday Discuss., 2020, Accepted Manuscript , DOI: 10.1039/C9FD00121B

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