Regensburg 2013 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 12: Poster: Nanoparticles and Composite Materials
CPP 12.20: Poster
Montag, 11. März 2013, 17:30–19:30, Poster C
Photoluminescence of CdSe, Au and Hybrid Nanoparticle Systems — •Daniel Braam1, Zheng Ma1, Pin-Wen Wang1,2, Jens Theis1, Günther M. Prinz1, Philipp Wagener3, Stephan Barcikowski3, and Axel Lorke1 — 1Fakultät für Physik and CENIDE, University of Duisburg-Essen, Lotharstraße 1, 47057 Duisburg, Germany — 2Harvard School of Engineering and Applied Sciences Pierce Hall 29 Oxford Street Cambridge, MA 02138, USA — 3Fakultät für Chemie and CENIDE, University of Duisburg-Essen, Universitätsstraße 7, 47057 Duisburg, Germany
Gold and Gold/Silver nanoparticles were fabricated with laser ablation and characterized with SEM, TEM, UV/VIS and photoluminescence measurements. They show a large size distribution and agglomeration, as well as a broad PL signal, which results from the decay of a particle plasmon within the model of Dulkeith et al [1]. Continuous excitation with a 405nm diode laser steadily shifts the peak wavelength to lower energies and reduces the intensity, which regenerates to some extend after exposure. In a second step we examine the interaction between metal and semiconductor nanoparticles by adding CdSe/ZnS quantum dots to the Au and Au/Ag NP solutions. First spectrum and peak analysis show mixed emission, which can be explained by a simple superposition of the Au and the CdSe NP PL. No indication of interaction between metallic and semiconductor nanoparticles is observed in the emission energies, presumably due to insufficient mixing, leading to a large distance between both components.
[1] E. Dulkeith et al., PRB 70, 205424 (2004)