Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 62: Graphene: SiC substrates and intercalation (O, jointly with HL, TT)

HL 62.7: Talk

Wednesday, March 13, 2013, 17:30–17:45, H17

Intercalation of hydrogen at the graphene/Ir(111) interface — •Thorsten Balgar, Hyunil Kim, and Eckart Hasselbrink — Universität Duisburg-Essen, Universitätsstr. 5, D-45141 Essen

Epitaxially grown graphene on an iridium crystal exhibits a well known moire pattern due to the lattice mismatch of graphene and the Ir(111) surface. This leads to a buckling of the carbon layer and a lateral modulation of the chemical reactivity towards adsorbates [1,2]. Unlike intercalated metal atoms hydrogen cannot be directly detected with surface scientists' standard analysis tool box, namely XPS or AES. In our study we have used vibrational sum frequency generation (SFG) spectroscopy to monitor the stretching vibration of hydrogen chemisorbed on graphene [3]. The results are discussed in view of the intercalation of hydrogen and the local formation of graphane-like structures.

[1] C. Busse et al., Phys. Rev. Lett. 107 (2011) 036101 [2] J. Wintterlin et al., Surf. Sci. 603 (2009) 1841 [3] Kim et al., Chem. Phys. Lett. 546 (2012) 12