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Decoupling Epitaxial Graphene From Metals By Potential-Controlled Electrochemical Oxidation: Chemistry Below Graphene

AuthorsPalacio, Irene CSIC ORCID; Otero, Gonzalo CSIC ORCID; Alonso, Concepción; Martínez, José I. CSIC ORCID; López-Elvira, Elena ; Muñoz-Ochando, Isabel; Salavagione, Horacio J. CSIC ORCID; López, María Francisca ; García-Hernández, M. ; Méndez, J.; Ellis, Gary James CSIC ORCID ; Martín-Gago, José A. CSIC ORCID
Issue DateSep-2017
CitationGraphene Week (2017)
AbstractWhile high-quality defect-free epitaxial graphene can be efficiently grown on metal substrates, strong interaction with the supporting metal quenches its outstanding properties. Thus, protocols to transfer graphene to insulating substrates are mandatory, and these often severely impair graphene properties by the introduction of structural or chemical defects. Here we describe a simple, fast and easily scalable general methodology to structurally and electronically decouple epitaxial graphene from metal surfaces. A multi-technique characterization of the different steps involved in the process, combined with ab-initio calculations, shows that after a controlled electrochemical oxidation process a single atom thick metal-hydroxide layer intercalates below graphene decoupling it from the metal substrate. The decoupling process takes place without disrupting the morphology and electronic properties of graphene. The electrochemical protocol has been proved to work on Gr/Pt(111) and Gr/Ir(111) substrates. Epitaxial graphene was grown in UHV conditions by thermal decomposition of fullerenes [1] and the samples were characterized in-situ by STM and LEED. Subsequent ex-situ characterization with AFM, XPS and Raman before and after the electrochemical treatment demonstrates the efficiency of the decoupling process. This work suggests that suitably optimized electrochemical treatments may provide viable alternatives to transfer protocols for graphene and other 2D materials on diverse metal surfaces.
DescriptionTrabajo presentado en la Graphene Week 2017, celebrada en Atenas del 25 al 29 de septiembre de 2017.
Appears in Collections:(ICTP) Comunicaciones congresos
(ICMM) Comunicaciones congresos
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