Regensburg 2013 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 9: Poster: Interfaces and Thin Films (joint session with DECHEMA and VDI)

CPP 9.10: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Characterization and investigation of the diffusion of silver nanoparticles using single molecule fluorescence spectroscopy — •Martin Hartmann, Stefan Krause, Thomas Baumgärtel, and Christian von Borczyskowski — Optical Spectroscopy and Molecular Physics Group, Chemnitz University of Technology, 09126 Chemnitz, Germany

Optical properties like the absorption or emission behavior of silver nanoparticles as a function of the particle size have been extensively studied in the past. Furthermore the catalytic and optical surface enhanced properties are of special interest.

In our experiments small silver nanoparticles with a diameter below 1 nm showed surprisingly diffusion phenomena on a pure silicon dioxide surface. The aim of this work is to characterize those nanoparticles, to find a reason why they are diffusing and to investigate their diffusion. Experiments were performed by means of optical microscopy and atomic force microscopy. We are able to show, that the investigated particles consist of less than 22 silver atoms. The reason for the diffusion seems to be a small water film on the silicon dioxide surface. Diffusion measurements for different humidities of the surrounding atmosphere have been carried out. It turned out that three main diffusion coefficients exist and two of them depend on the air humidity.