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Effects of a modular two-step ozone-water and annealing process on silicon carbide graphene / Matthew J. Webb; Craig Polley; Kai Dirscherl; Gregory Burwell; Pål Palmgren; Yuran Niu; Anna Lundstedt; Alexei A. Zakharov; Owen Guy; Thiagarajan Balasubramanian; Rositsa Yakimova; Helena Grennberg

Applied Physics Letters, Volume: 105, Issue: 8, Start page: 081602

Swansea University Author: Owen, Guy

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DOI (Published version): 10.1063/1.4893781

Abstract

By combining ozone and water, the effect of exposing epitaxial graphene on silicon carbide to an aggressive wet-chemical process has been evaluated after high temperature annealing in ultra high vacuum. The decomposition of ozone in water produces a number of oxidizing species, however, despite long...

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Published in: Applied Physics Letters
Published: 2014
URI: https://cronfa.swan.ac.uk/Record/cronfa19736
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Abstract: By combining ozone and water, the effect of exposing epitaxial graphene on silicon carbide to an aggressive wet-chemical process has been evaluated after high temperature annealing in ultra high vacuum. The decomposition of ozone in water produces a number of oxidizing species, however, despite long exposure times to the aqueous-ozone environment, no graphene oxide was observed after the two-step process. The systems were comprehensively characterized before and after processing using Raman spectroscopy, core level photoemission spectroscopy, and angle resolved photoemission spectroscopy together with low energy electron diffraction, low energy electron microscopy, and atomic force microscopy. In spite of the chemical potential of the aqueous-ozone reaction environment, the graphene domains were largely unaffected raising the prospect of employing such simple chemical and annealing protocols to clean or prepare epitaxial graphene surfaces.
College: College of Engineering
Issue: 8
Start Page: 081602