Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Interfaces and Thin Films II

CPP 7.8: Vortrag

Montag, 14. März 2011, 16:00–16:15, ZEU 114

Characterization of spectral diffusion and its application to probe thin polymer films — •Daniela Täuber¹, Stefan Krause¹, Beatriz Aráoz², Pedro F. Aramendía², and Christian von Borczyskowski¹ — ¹nanoMA, TU-Chemnitz, Institut für Physik, Germany — ²FCEN, Universidad Buenos Aires, Argentina

Dye molecules with a large solvent shift are used to probe local properties in thin polymer films. Upon excitation with the 488 nm line of an Argon-ion-laser, the emission spectra show spectral diffusion: small temporal fluctuations and larger jumps. In analogy to anomalous spatial diffusion we use a newly developed tool[1] to characterize this spectral diffusion: Probability distributions of spectral diffusivities [2].

This method is applied to analyze different thin poly-n-alkyl methacrylate films on Si wafers with 100 nm SiOx.

[1] M. Bauer, M. Heidernätsch, D. Täuber, C. von Borczyskowski, and G. Radons, Diffusion Fundamentals, 11, 2009, 104.

[2] S. Krause, P.F. Aramendía, D. Täuber, C. von Borczyskowski, Freezing Single Molecule Dynamics on Interfaces and in Polymers, PCCP, accepted.