Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)
O 27.63: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
A spectroscopy study of water adsorption on diamond surfaces — •Simon Quartus Lud1, Dominique Verreault2, Patrick Koelsch2, Martin Huth3, Bert Nickel3, Hendrik Bluhm4, John Newberg4, Martin Stutzmann1, and Jose Antonio Garrido1 — 1Walter Schottky Institut, Technische Universität München, Am Coulombwall 3, 85748 Garching, Germany — 2Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany — 3Department für Physik, Ludwig-Maximilians-Universität München, Geschwister-Scholl-Platz 1, 80539 München, Germany — 4Chemical Sciences Division, Lawrence Berkeley National Laboratories, Berkeley, CA 94720, USA
We have explored the adsorption of water layers onto different diamond surfaces at the solid-gas interface. X-ray reflectivity (XRR), sum frequency generation (SFG) spectroscopy and X-ray photoelectron spectroscopy (XPS) have been used to investigate the adsorbed water onto the diamond films under controlled humidity. XRR reveals the presence of a water film on the hydrophilic O-terminated surfaces, with a thickness increasing with humidity. Interestingly, even if highly hydrophobic, the hydrogenated surface also shows a humidity-dependent water film. SFG spectroscopy, with its high surface sensitivity, revealed different vibrational modes of interfacial water, including the so-called free OH stretching mode at 3700 cm−1. Temperature dependent SFG experiments were performed to investigate the stability of the water films on H-, F- and O-terminated surfaces, unveiling a surprisingly high stability for water even on the hydrophobic surfaces.