English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/169842
logo share SHARE   Add this article to your Mendeley library MendeleyBASE
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:


A New strategy to decouple epitaxial graphene from metals: Potential-controlled electrochemical oxidation

AuthorsPalacio, Irene CSIC ORCID; Otero, Gonzalo CSIC ORCID; Alonso, Concepción; López-Elvira, Elena ; Martínez, José I. CSIC ORCID; Muñoz-Ochando, Isabel; Salavagione, Horacio J. CSIC ORCID; Méndez, Javier CSIC ORCID; López, María Francisca ; Ellis, Gary James CSIC ORCID ; Martín-Gago, José A. CSIC ORCID
Issue DateSep-2016
CitationFuerzas y Túnel (2016)
AbstractThe catalytic role of the metallic substrates has been the perfect starting point to grow high quality graphene layers by thermal decomposition of aromatics [1]. However, metallic substrates quench the graphene’s outstanding properties that make graphene the most promising material for future applications. Thus, protocols to transfer graphene to different technologically relevant substrates are mandatory. These transfer processes are cost inefficient and some can severely degrade the properties of graphene by introducing structural and chemical defects. As an alternative, we propose a novel approach that is less invasive and easily scalable. We target pristine graphene sheets grown on metals and employ electrochemical oxidation at controlled potentials to introduce a single atom-thick oxide decoupling layer. A multi-technique structural characterization (STM, AFM and Raman) combined with theoretical studies (ab-initio calculations) of the different steps of the process has been carried out to fully understand this decoupling. Epitaxial graphene has been grown on Pt(111) in UHV by thermal decomposition of aromatics. Fig. 1a shows a representative STM image of a typical Moiré as well as the typical LEED pattern obtained for Gr on Pt(111) [2]. After in-situ characterization the sample was removed from UHV and characterized by AFM, SEM and Raman spectroscopy before and after electrochemical treatments. Fig. 1b shows important changes in the Raman spectra of the graphene layer induced by the electrochemical treatment. The AFM overall topography shows that about 90% of the surface is decoupled, and ab-initio calculations clearly show that intercalation of a single atom-thick oxide layer can induce a structural separation of the graphene with respect to the surface. These results suggest that carefully controlled electrochemical oxidation can provide an alternative and cleaner method to the transfer of graphene.
DescriptionTrabajo presentado en la conferencia Fuerzas y Túnel (FyT2016), celebrada en Girona del 5 al 7 de septiembre de 2016.
Appears in Collections:(ICTP) Comunicaciones congresos
(ICMM) Comunicaciones congresos
Files in This Item:
File Description SizeFormat 
decouple_epitaxial_graphene.pdf450,52 kBAdobe PDFThumbnail
Show full item record
Review this work

WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.