Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Graphene II

O 27.2: Vortrag

Dienstag, 27. März 2012, 10:45–11:00, MA 041

The stretching vibration of hydrogen adsorbed on epitaxial graphene — Hyunil Kim, •Thorsten Balgar, and Eckart Hasselbrink — Universität Duisburg-Essen, Fakultät für Chemie, Essen, Germany

The adsorption of hydrogen is one favorable approach for opening a bandgap in the bandstructure of graphene[1]. However, the binding geometry is still a matter of debate. Vibrational spectroscopy is a powerful tool which provides insight into the binding situation of adsorbates. We use IR/Vis sum-frequency generation (SFG) spectroscopy to study the stretching vibration of hydrogen chemically bound to a graphene sheet epitaxially grown on an Ir(111) crystal surface. The assignment of the observed resonances to C-H (C-D) stretching vibrations is discussed in view of the propensity for local cluster formation[2,3].

[1] Balog et al., Nat. Mater. (2010) 9 (4) pp. 315-319

[2] Kim et al., Chem. Phys. Lett. (2011) 508 (1-3) pp. 1-5

[3] Ng et al., J. Phys. Chem. C (2010) 114 (43) pp. 18559-18565