Hydrogen interaction with graphene on Ir(1 1 1): a combined intercalation and functionalization study

Richard Balog, Andrew Cassidy, Jakob Holm Jørgensen, Line Kyhl Hansen, Mie Andersen, Antonija Grubisic Cabo, Foteini Ravani, Luca Bignardi, Paolo Lacovig, Silvano Lizzit, Liv Hornekær

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Abstract

We demonstrate a procedure for obtaining a H-intercalated graphene layer that is found to be chemically decoupled from the underlying metal substrate. Using high-resolution x-ray photoelectron spectroscopy and scanning tunneling microscopy techniques, we reveal that the hydrogen intercalated graphene is p-doped by about 0.28 eV, but also identify structures of interfacial hydrogen. Furthermore, we investigate the reactivity of the decoupled layer towards atomic hydrogen and vibrationally excited molecular hydrogen and compare these results to the case of non-intercalated graphene. We find distinct differences between the two. Finally, we discuss the possibility to form graphane clusters on an iridium substrate by combined intercalation and H atom exposure experiments.

Original languageEnglish
Article number085001
JournalJournal of Physics: Condensed Matter
Volume31
Issue8
Number of pages11
ISSN0953-8984
DOIs
Publication statusPublished - 10 Jan 2019

Keywords

  • functionalization
  • grapheme
  • intercalation
  • MAGNETISM
  • graphene

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