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

Xia, C.; Watcharinyanon, S.; Zakharov, Alexei LU ; Johansson, L. I.; Yakimova, R. and Virojanadara, C. (2013) In Surface Science 613. p.88-94
Abstract
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... (More)
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. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
keywords
Epitaxial graphene on SiC, Sodium intercalation, LEEM, XPEEM, mu-LEED, mu-PES
in
Surface Science
volume
613
pages
88 - 94
publisher
Elsevier
external identifiers
  • wos:000319180600014
  • scopus:84876745088
ISSN
0039-6028
DOI
10.1016/j.susc.2013.03.011
language
English
LU publication?
yes
id
af5b9efc-2aa4-4316-b9d5-c0d6c2546bf5 (old id 3931406)
date added to LUP
2013-07-15 14:43:37
date last changed
2019-09-01 04:45:36
@article{af5b9efc-2aa4-4316-b9d5-c0d6c2546bf5,
  abstract     = {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.},
  author       = {Xia, C. and Watcharinyanon, S. and Zakharov, Alexei and Johansson, L. I. and Yakimova, R. and Virojanadara, C.},
  issn         = {0039-6028},
  keyword      = {Epitaxial graphene on SiC,Sodium intercalation,LEEM,XPEEM,mu-LEED,mu-PES},
  language     = {eng},
  pages        = {88--94},
  publisher    = {Elsevier},
  series       = {Surface Science},
  title        = {Detailed studies of Na intercalation on furnace-grown graphene on 6H-SiC(0001)},
  url          = {http://dx.doi.org/10.1016/j.susc.2013.03.011},
  volume       = {613},
  year         = {2013},
}