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Detailed studies of Na intercalation on furnace-grown graphene on 6H-SiC(0001)

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Author

  • C. Xia
  • S. Watcharinyanon
  • Alexei Zakharov
  • L. I. Johansson
  • R. Yakimova
  • C. Virojanadara

Summary, in English

The effects induced by Na deposited on furnace grown graphene on SiC(0001) and after subsequent annealing are investigated using LEEM, mu-LEED, mu-PES and XPEEM. Intercalation in between carbon layers and at the interface is observed to occur both on the 1 ML and 2 ML areas directly after Na deposition. Annealing at a temperature around 100 degrees C is found to strongly promote Na intercalation. Exposure to the electron beam or the focused synchrotron radiation in the LEEM/XPEEM is also found to promote the intercalation, which is confirmed to begin at domain boundaries between the 1 ML and 2 ML areas, and also as stripe/streak-like features on the 1 ML areas. The XPEEM data show Na adsorption on the surface and intercalation at the interface to be quite non-uniform. When annealing at higher temperatures Na starts to de-intercalate and leave the sample, but Na is still detectable on the sample after annealing at 240 degrees C. (C) 2013 Elsevier B.V. All rights reserved.

Department/s

Publishing year

2013

Language

English

Pages

88-94

Publication/Series

Surface Science

Volume

613

Document type

Journal article

Publisher

Elsevier

Topic

  • Natural Sciences
  • Physical Sciences

Keywords

  • Epitaxial graphene on SiC
  • Sodium intercalation
  • LEEM
  • XPEEM
  • mu-LEED
  • mu-PES

Status

Published

ISBN/ISSN/Other

  • ISSN: 0039-6028