Regensburg 2019 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 98: Organic Molecules on Inorganic Substrates VII

O 98.6: Vortrag

Freitag, 5. April 2019, 11:45–12:00, H17

Hybrid nanoassemblies of ordered nanoparticles and perylene — •Natalia Alyabyeva, Aimeric Ouvrard, and Bernard Bourguignon — Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405 Orsay, France

We demonstrate ordering of hybrid assemblies of Pd nanoparticles (NPs) and perylene on Al2O3/Ni3Al(111). Multi-scale surface science techniques provide a complete description of this system. Scanning tunnelling microscopy (STM) probe topography, adsorption sites and local density of states, while differential reflectance spectroscopy (DRS) and sum frequency generation (SFG) give access to molecular orientation, coverage and thickness. Different adsorption phases of perylene on alumina depending on coverage and the presence of NPs have been observed. Perylene organizations on bare alumina are in registry with the substrate, evidencing the balanced interplays of molecule-substrate and intermolecular interactions. Molecules are flat-laying at low coverage and up-standing when the layer densifies as well as in the multilayer regime. Ordered hybrid assemblies can be formed where perylene is flat-laying in between NPs smaller than 1 nm. For larger coverage and NP size, perylene is up-standing and also adsorbing on NPs. Disorder progressively appears, showing that NPs hinders long-range intermolecular interactions. Adsorption on NPs leads to a larger SFG signal and a different electronic structure as observed by DRS and STM. Ordered NPs and molecules offer a way to tune electronic, chemical, and optical properties to build optimal architectures for future nanoelectronic devices.