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Monitoring of epitaxial graphene anodization
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0001-8478-4663
Linköpings universitet, Institutionen för fysik, kemi och biologi. Linköpings universitet, Tekniska fakulteten. Department of Chemistry, Stanford University, Stanford, USA.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Halvledarmaterial. Linköpings universitet, Tekniska fakulteten.ORCID-id: 0000-0003-1000-0437
Linköpings universitet, Institutionen för teknik och naturvetenskap, Fysik och elektroteknik. Linköpings universitet, Tekniska fakulteten.
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2017 (engelsk)Inngår i: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 238, s. 91-98Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
Pergamon Press, 2017. Vol. 238, s. 91-98
Emneord [en]
Epitaxial graphene; Graphene monolayer; Anodization; Electrode kinetics; Raman spectroscopy; voltammetry; Electrochemical impedance spectroscopy
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Identifikatorer
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, id: diva2:1109397
Tilgjengelig fra: 2017-06-14 Laget: 2017-06-14 Sist oppdatert: 2017-11-03bibliografisk kontrollert

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