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Quasi-Free-Standing Epitaxial Graphene on SiC Obtained by Hydrogen Intercalation

Författare:
Publiceringsår: 2009
Språk: Engelska
Publikation/Tidskrift/Serie: Physical Review Letters
Volym: 103
Nummer: 24
Dokumenttyp: Artikel
Förlag: Amer Physical Soc

Sammanfattning

Quasi-free-standing epitaxial graphene is obtained on SiC(0001) by hydrogen intercalation. The hydrogen moves between the (6 root 3 x 6 root 3) R 30 degrees reconstructed initial carbon layer and the SiC substrate. The topmost Si atoms which for epitaxial graphene are covalently bound to this buffer layer, are now saturated by hydrogen bonds. The buffer layer is turned into a quasi-free-standing graphene monolayer with its typical linear pi bands. Similarly, epitaxial monolayer graphene turns into a decoupled bilayer. The intercalation is stable in air and can be reversed by annealing to around 900 degrees C.

Disputation

Nyckelord

  • Physics and Astronomy

Övrigt

Published
Yes
  • ISSN: 0031-9007

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