Regensburg 2010 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 36: Poster: Nanoparticles and Composite Materials
CPP 36.11: Poster
Mittwoch, 24. März 2010, 17:30–19:00, Poster B2
Optical characterization of dye doped silica nanoparticles — •Ines Trenkmann1, Harald Graaf1, Sangho Bok2, Shubhra Gangopadhyay2, and Christian von Borczyskowski1 — 1Chemnitz University of Technology, Institute of Physics, Germany — 2University of Missouri, Dept. of Electrical and Computer Engineering, USA
Over the last years embedding single dye molecules in a solid state matrix became a matter of interest due to the improved mechanical, thermal and chemical stability. Therefore such hybrids became attractive for various applications such as solid-state dye lasers and chemical sensors [1, 2].
We used various ensemble and single-molecule techniques to analyze the optical properties of organosilicate nanoparticles (3 - 5 nm in diameter), which are marked with the fluorescent dye rhodamine 6G [3, 4]. Besides the fluorescence spectra and lifetime, fluorescence time traces for a large number of single particles were recorded. Thereby the distributions of the on- and off-times follow power-law statistics. Additionally we could observe different sub-groups which differ in the number of observed intensity levels. From this we assumed the average number of embedded dye to 2 - 3 molecules.
[1] García-Revilla, S., et al.: Opt. Mat. 31(2009) 1086]
[2] Wang, H, et al.: J. Phys. Chem. B 102(1998) 7231
[3] Trenkmann, I., et al.: Diffusion Fundamentals submitted
[4] Bok, S. et al.: unpublished results