Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session III (Nanotribology; Polymeric biomolecular films; Organic electronics and photovoltaics, Covalent networks on surfaces; Phase transitions; Particles and clusters; Transparent conductive oxides)
O 59.19: Poster
Mittwoch, 16. März 2011, 17:30–21:00, P3
Ag clusters in polymer PDMS: UV-VIS absorption and XANES — •Kamil Latussek1, Sabrina Hoffmann1, 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
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 possible amount of noble metal clusters deposited on a SiO2 substrate is limited by the process of beginning coalescence to larger particles and electromagnetic coupling. Depositing these clusters into a matrix such as a polymer yields the possibility to investigate a much higher amount of separated particles. The plasmon resonance of Ag clusters in PDMS 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 [2].
[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).
[2] P. Behrens et al., Z. anorg. allg. Chem. 625, 111 (1999).