Regensburg 2002 – wissenschaftliches Programm

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O: Oberflächenphysik

O 34: Organische Dünnschichten

O 34.10: Vortrag

Donnerstag, 14. März 2002, 17:45–18:00, H45

Self-assembled monolayers of selenolates on gold and silver substrates — •Andrey Shaporenko1, Abraham Ulman2, Andreas Terfort3, Michael Zharnikov1, and Michael Grunze11Angewandte Physikalische Chemie, Universität Heidelberg, D-69120 Heidelberg — 2Department of Chemistry, Polytechnic University, Brooklyn, New York 11201 — 3Anorganische und Angewandte Chemie, Universität Hamburg, 20146 Hamburg

Self-assembled monolayers (SAMs) formed from several aliphatic and aromatic selenide compounds on gold and silver substrates were studied using infrared reflection-absorption spectroscopy (IRRAS), synchrotron-based high-resolution X-ray photoelectron spectroscopy (HRXPS) and water contact angle measurements. Character, length and chemical composition of the molecular chain of the selenide compounds have been varied. Selenolates were concluded to adsorb on gold and silver substrates and form stable monolayers. Such monolayers can be considered as alternatives to thiolates for fabricating SAMs on noble metal surfaces. The SAMs showed clear IR absorption bands corresponding to intact molecular chains of definite conformation. Distinct C1s photoemission peaks were observed and related to a well-defined aliphatic or aromatic chain. Only one selenium species was assumed in all investigated SAMs on the basis of the Se3d HRXPS spectra. The results suggest a dissotiative mode of monolayer formation from diselenide compounds on gold and silver substrates.

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