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

In English

Författare

  • 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.

Publiceringsår

2013

Språk

Engelska

Sidor

88-94

Publikation/Tidskrift/Serie

Surface Science

Volym

613

Dokumenttyp

Artikel i tidskrift

Förlag

Elsevier

Ämne

  • Natural Sciences
  • Physical Sciences

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 0039-6028