Div. of Synchrotron Radiation Research


Elin Grånäs, Mie Andersen, Mohammad A. Arman, Timm Gerber, Bjørk Hammer, Joachim Schnadt, Jesper N. Andersen, Thomas Michely, and Jan Knudsen
CO Intercalation of Graphene on Ir(111) in the Millibar Regime
J. Phys. Chem. C 117 16438 (2013).

Here we show that it is possible to intercalate CO under graphene grown on Ir(111) already at room temperature when CO pressures in the millibar regime are used. From the interplay of X-ray photoelectron spectroscopy and scanning tunneling microscopy we conclude that the intercalated CO adsorption structure is similar to the (3ã3 ~ 3ã3)R30‹) adsorption structure that is formed on Ir(111) upon exposure to 1 mbar of CO. Further, density functional theory calculations reveal that the structural and electronic properties of CO-intercalated graphene are similar to p-doped freestanding graphene. Finally we characterize nonintercalated stripes and islands that we always observe in the CO-intercalated graphene. We observe these nonintercalated areas predominately in HCP and FCC areas near step edges and suggest that stress release in graphene is the driving force for their formation, while the weak chemical bonds in HCP and FCC areas are the reason for their area selectivity.

Link to the complete paper (if available):

Lunds universitet, Avdelningen för synkrotronljusfysik
Besöks- och leveransadress: Sölvegatan 14, 223 62 Lund
Postadress: Box 118, 221 00 Lund
Fakturaadress: Box 188, 221 00 Lund
OBS! Beställarens för- och efternamn måste alltid anges som referens på fakturan!

Lund University, Division of Synchrotron Radiation Research
Visiting and delivery address: Sölvegatan 14, 223 62 Lund, Sweden
Mail address: Box 118, 221 00 Lund, Sweden
Billing address: Box 188, 221 00 Lund, Sweden
Please observe that all bills have to contain the orderer's first and last name as the reference.

Phone: +46 (0)46-222 00 00, Fax: +46 (0)46-222 42 21
Webmaster: Johan Gustafson