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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.39: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

Vibrational spectroscopy of atomic hydrogen adsorbed on graphene — •Hyunil Kim, Thorsten Balgar, and Eckart Hasselbrink — Fakultät für Chemie, Universität Duisburg-Essen, D-45117 Essen, Germany

Graphene is a promising candidate as an alternative material for future electronic devices. Thus, graphene is an very interesting system to study its properties.

Our research is focused on vibrational excited absorbates on solid state surfaces by means of VIS/IR sum frequency generation (SFG). Here we present studies on the vibrational stretching mode of atomic hydrogen on graphene. We compare our results with DFT calculations, done by Sakong et al. SFG spectroscopy offers high interface sensitivity and allows for analysing such adsorbat systems.

We generate the graphene by the chemical vapor deposition process (CVD) of ethylene on Ir(111) in an ultra high vacuum chamber. The vibrational spectroscopy is realized by a ps-lasersystem with an optical parametric generator/difference frequency generator (OPG/DFG).

S. Sakong and P. Kratzer, J. Chem. Phys. 133, 054505 (2010).

X. Han, T. Balgar and E. Hasselbrink, J. Chem. Phys. 130, 134701 (2009).

J. Coraux et al., New J. Phys. 11 (2), 023006 (2009).