Reversible Graphene decoupling by NaCl photo-dissociation.

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ID: 87859
2019
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Abstract
We describe the reversible intercalation of Na under graphene on Ir(111) by photo-dissociation of a previously adsorbed NaCl overlayer. After room temperature evaporation, NaCl adsorbs on top of graphene forming a bilayer. With a combination of electron diffraction and photoemission techniques we demonstrate that the NaCl overlayer dissociates upon a short exposure to an X-ray beam. As a result, chlorine desorbs while sodium intercalates under the graphene, inducing an electronic decoupling from the underlying metal. Low energy electron diffraction shows the disappearance of the moiré pattern when Na intercalates between graphene and iridium. Analysis of the Na 2p core-level by X-ray photoelectron spectroscopy shows a chemical change from NaCl to metallic buried Na at the graphene/Ir interface. The intercalation-decoupling process leads to a n-doped graphene due to the charge transfer from the Na, as revealed by constant energy angle resolved X-ray photoemission maps. Moreover, the process is reversible by a mild annealing of the samples without damaging the graphene.
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palacio2019reversible2d Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Palacio, I;Aballe, L;Foerster, M;de Oteyza, D G;García-Hernández, M;Martín-Gago, J A;
Journal 2d materials
Year 2019
DOI
025021
URL
Keywords
alkali metals graphene intercalation nacl decoupling photo-dissociation

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