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DS: Fachverband Dünne Schichten

DS 4: Organic Thin Films I

DS 4.9: Vortrag

Montag, 7. März 2016, 12:00–12:15, H11

1,4-phenylene diisocyanide adsorption on metals : from single crystals to supported nanoparticles — •ahmed ghalgaoui, nassar doudin, and martin sterrer — Institute of Physics, University of Graz, Universitätsplatz 5, A-8010 Graz, Austria

We have investigated the adsorption of PDI on single crystal metal surfaces and metal nanoparticles supported by an insulting layer (Au\FeO\Pt(111)). Both, gas-phase and liquid-phase deposition methods were applied. The role of PDI concentration and Au nanoparticle size on the surface structure/adsorption mode of PDI has been investigated by STM and Sum Frequency Generation (SFG) Spectroscopy. The PDI molecule adsorbs either with both - NC groups interacting with the surface, leading to flat adsorption geometry, or by only one - NC group, assuming a vertical adsorption structure. SFG measurements in the -NC stretching region show that PDI deposited from the gas-phase always binds with both - NC groups to Au(111), independent of surface coverage. In the case of liquid-phase deposition, PDI molecules adsorb in the flat adsorption geometry at low concentration, but change to the vertical geometry upon increasing the concentration. This concentration dependence is absent on Pt(111), where PDI exclusively adsorbs in the vertical geometry. Finally, the influence of Au particle size on the adsorption structure of PDI will be discussed.