Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
O: Fachverband Oberflächenphysik
O 76: Plasmonics and Nanooptics VII
O 76.1: Vortrag
Donnerstag, 17. März 2011, 15:00–15:15, WIL A317
Optical and electronic properties of Ag clusters on SiO2 — •Sabrina Hoffmann1, Kamil Latussek1, Stefanie Duffe1, Christian Sternemann1, Ralph Wagner2, and Heinz Hövel1 — 1TU Dortmund, Experimentelle Physik I, Otto-Hahn-Str. 4, 44221 Dortmund, Germany — 2BU Wuppertal, Fachbereich C - Fachgruppe Physik - Materialwissenschaften, Gaußstraße 20, 42097 Wuppertal, Germany
Clusters assembled materials are of great impact for future applications in science and nanotechnology. In particular, advances in metal cluster-beam technology allow experiments on free and supported or embedded clusters resembling nanostructures in realistic, technical relevant environments. Optical properties of noble metal clusters and nanostructures such as their UV-VIS absorption band alter significantly with size, shape and interparticle spacing as well as with the properties of the local environment. The plasmon resonance of Ag clusters on SiO2 before and after exposure to air is examined using optical spectroscopy [1]. Then the same clusters are examined with XANES at the Ag L3 edge. With this method changes in the uDOS of clusters can be investigated which occur either due to the cluster size or a change in their chemical environment. After exposing the Ag clusters to H2S the plasmon resonance disappears and the XANES spectra show that the clusters are transformed to silver sulfide.
[1] U. Kreibig et al., Optical Investigations of Surfaces and Interfaces of Metal Clusters, In: Advances in Metal and Semiconductor Clusters Vol. 4, (ed. M.A. Duncan), JAI press Inc., 345 (1998).