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Monitoring of epitaxial graphene anodization
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0001-8478-4663
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering. Department of Chemistry, Stanford University, Stanford, USA.
Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0003-1000-0437
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
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2017 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 238, 91-98 p.Article in journal (Refereed) Published
Abstract [en]

Anodization of a graphene monolayer on silicon carbide was monitored with electrochemical impedance spectroscopy. Structural and functional changes of the material were observed by Raman spectroscopy and voltammetry. A 21 fold increase of the specific capacitance of graphene was observed during the anodization. An electrochemical kinetic study of the Fe(CN)(6)(3) (/4) redox couple showed a slow irreversible redox process at the pristine graphene, but after anodization the reaction rate increased by several orders of magnitude. On the other hand, the Ru(NH3) (3+/2+)(6) redox couple proved to be insensitive to the activation process. The results of the electron transfer kinetics correlate well with capacitance measurements. The Raman mapping results suggest that the increased specific capacitance of the anodized sample is likely due to a substantial increase of electron doping, induced by defect formation, in the monolayer upon anodization. The doping concentration increased from less than 1 x 10(13) of the pristine graphene to 4-8 x 10(13) of the anodized graphene. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
Pergamon Press, 2017. Vol. 238, 91-98 p.
Keyword [en]
Epitaxial graphene; Graphene monolayer; Anodization; Electrode kinetics; Raman spectroscopy; voltammetry; Electrochemical impedance spectroscopy
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-138227DOI: 10.1016/j.electacta.2017.04.016ISI: 000401113500011Scopus ID: 2-s2.0-85017308595OAI: oai:DiVA.org:liu-138227DiVA: diva2:1109397
Available from: 2017-06-14 Created: 2017-06-14 Last updated: 2017-11-03Bibliographically approved

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The full text will be freely available from 2019-04-04 13:36
Available from 2019-04-04 13:36

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Vagin, MikhailSekretareva, AlinaIvanov, Ivan GueorguievHåkansson, AnnaIakimov, TihomirSyväjärvi, MikaelYakimova, RositsaLundström, IngemarEriksson, Mats
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