Detailed studies of Na intercalation on furnace-grown graphene on 6H-SiC(0001)
2013 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 613, 88-94 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
Elsevier , 2013. Vol. 613, 88-94 p.
Epitaxial graphene on SiC, Sodium intercalation, LEEM, XPEEM, mu-LEED, mu-PES
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-94593DOI: 10.1016/j.susc.2013.03.011ISI: 000319180600014OAI: oai:DiVA.org:liu-94593DiVA: diva2:633681
Funding Agencies|Swedish Research Council|621-2011-4252|ESF||EU||2013-06-272013-06-272015-08-28