Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.11: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster B

Characterization of Pt and Au nanoparticles on Fe3O4/Pt(111) thin film — •Alessandro Sala, Francesca Genuzio, Hagen Klemm, Thomas Schmidt, and Hans-Joachim Freund — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany

Pt and Au nanoparticles are catalytically active systems which show a peculiar strong metal-support interaction [1]. The formation of such nanoparticles over a iron oxide thin film has been observed in-situ and in real-time with SMART; this Low Energy and PhotoEmitted Electron Microscope can combine microscopy, spectroscopy and diffraction with high resolution and transmission to collect information about the morphology, the chemical distribution and the structural and electronic properties of complex systems. Particularly, XPEEM images reveal under particular conditions the formation by dewetting of FeO domains and the different nucleation of Au nanoparticles on this domains respect to the Fe3O4 area. LEEM, LEED, XPEEM and XPS permits to characterize the growth, the morphology and the electronic properties of Pt nanoparticles and their encapsulation by FeO, under different deposition conditions. [1] Z.-H. Qin, M. Lewandowski, Y.-N. Sun, S. Shaikhutdinov, and H.-J. Freund, J. Phys. Chem. C 2008, 112, 10209-10213