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Reversible Graphene decoupling by NaCl photo-dissociation.

I Palacio1, L Aballe2, M Foerster2

  • 1Materials Science Factory, Dept. Surfaces, Coatings and Molecular Astrophysics, Institute of Material Science of Madrid (ICMM-CSIC), C/Sor Juana Inés de la Cruz 3, 28049 Madrid, Spain.

2D Materials
|April 16, 2019
PubMed
Summary

Sodium intercalation under graphene on Iridium(111) is achieved by X-ray-induced dissociation of NaCl. This process electronically decouples graphene, creating n-doped graphene, and is reversible by annealing.

Keywords:
NaClalkali metalsdecouplinggrapheneintercalationphoto-dissociation

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Area of Science:

  • Surface Science
  • Materials Science
  • Condensed Matter Physics

Background:

  • Graphene on metal substrates is crucial for electronic applications.
  • Controlling the interface between graphene and metals is key to tuning its electronic properties.
  • Sodium intercalation offers a route to decouple graphene from its substrate.

Purpose of the Study:

  • To demonstrate reversible sodium intercalation under graphene on Ir(111).
  • To investigate the electronic decoupling and doping effects of intercalated sodium.
  • To explore the use of photo-dissociation for controlled intercalation.

Main Methods:

  • X-ray photoemission spectroscopy (XPS) for chemical state analysis.
  • Low energy electron diffraction (LEED) for structural characterization.
  • Photo-dissociation of NaCl overlayer using X-ray beams.

Main Results:

  • Sodium (Na) intercalates between graphene and Ir(111) after NaCl dissociation.
  • Intercalation leads to electronic decoupling, evidenced by the disappearance of the moiré pattern.
  • Graphene becomes n-doped due to charge transfer from intercalated sodium.
  • The intercalation process is reversible via mild annealing.

Conclusions:

  • X-ray-induced NaCl dissociation is an effective method for reversible Na intercalation under graphene.
  • This technique allows for controlled tuning of graphene's electronic properties.
  • The decoupling and n-doping of graphene have significant implications for future electronic devices.