Berlin 2015 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 41: Inorganic/Organic Interfaces

O 41.37: Poster

Dienstag, 17. März 2015, 18:15–21:00, Poster B

Spectroscopic study of self-assembled monolayers on a Co(0001) surface — •Runyuan Han, David A. Duncan, Johannes Bauer, Peter Feulner, and Francesco Allegretti — Physics Department e20, TU München, Germany

Self-assembled monolayers (SAMs) are systems of high technological relevance and thiolate-bonded SAMs on gold and other coinage metal surfaces have been regarded as prototypical systems for fundamental understanding [J.C. Love et al., Chem. Rev. 105, 1103]. Currently, there is an increasing demand for application of SAMs on more reactive transition metals, such as Pt, Ni and Fe [Z. Mekhalif et al., Langmuir 19, 637; P. G. Hoertz et al., J. Am. Chem. Soc. 130, 9763], however the increased strength of the sulfur-metal interaction poses strong limitations to the stability of these systems. Here, we test benzoate-bonded SAMs as possible candidates for room temperature stable monolayers and compare the adsorption behavior of a 4-fluorobenzoic acid molecule onto the Co(0001) surface to that of 4-fluorothiophenol by employing a combination of X-ray photoelectron spectroscopy and X-ray absorption spectroscopy with synchrotron radiation. We show that the benzoate SAMs exhibit a much higher thermal stability and lead to well-defined layers. Moreover, by resonant photoemission we investigate the charge transfer dynamics from the end group and head group to the substrate. Supported by the DFG (MAP B.1.3 & B.1.4), Helmholtz-Zentrum Berlin and China Scholarship Council.