Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 42: Poster Session II (Nanostructures at surfaces: arrays; Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: Other; Nanostructures at surfaces: Wires, tubes; Metal substrates: Adsorption of O and/or H; Metal substrates: Clean surfaces; Metal substrates: Adsorption of organic/bio moledules; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsorption of inorganic molecules; Metal substrates: Epitaxy and growth; Heterogeneous catalysis; Surface chemical reactions; Ab-initio approaches to excitations in condensed matter; Organic, polymeric, biomolecular films– also with adsorbates; Particles and clusters)
O 42.110: Poster
Mittwoch, 25. März 2009, 17:45–20:30, P2
Study of azobenzene-containing self-assembled monolayers with surface plasmon resonance spectroscopy — •Olena Filinova, Ulrich Jung und Olaf Magnussen — Institut für Experimentelle und Angewandte Physik, Leibnizstraße 19, 24098 Kiel
Azobenzene-containing molecules can be switched between the trans and cis isomers by UV and visible light. Adsorbate layers of such molecular switches on surfaces are of great interest for the formation of functional nanosystems. Using surface plasmon resonance spectroscopy we have studied the kinetics of the photoisomerization processes for self-assembled monolayers containing azobenzene bound by thiol- and triazatriangulenium groups to Au surface. Using an Hg-lamp with bandpass filter the trans-cis photoswitching was monitored as a function of wavelength and radiation power. These measurements allowed to optimize the conditions for photoswitching and to determine the time constants for the first order kinetics of this processes, which allowed to estimate quantum yields of the photoisomerization reactions in the range 10−5 to 10−3.