Dresden 2014 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 37: Poster Session 2

CPP 37.5: Poster

Mittwoch, 2. April 2014, 15:00–19:00, P3

Spatially Resolved Single Molecule Spectroscopy in Thin Semi-Crystalline Polypropylene Films — •Gordon Herwig, Stefan Krause, Martin Neumann, Robert Magerle, and Christian von Borczyskowski — Technische Universität Chemnitz, Fakultät für Naturwissenschaften, Chemnitz, Germany

The fluorescence of a single molecule is a sensitive indicator for its environment. Changes of the fluorescence lifetime, emission wavelength and polarization can report spatial and temporal changes within the vicinity of the dye. Here we report on confocal microscopy studies of single perylene diimides in thin films of semi-crystalline polypropylene with a spatially complex microstructure on the nanometer scale. The velocity of the orientational diffusion is measured and correlated with the information about the dye's local environment. The latter is obtained from high-resolution atomic force microscopy (AFM) images of the specimen's microstructure. Fluorescent particles that are visible in both confocal microscopy and AFM images are used for image registration with high spatial accuracy. This allows us to determine the position of individual dye molecules between crystalline lamellae and provides insight into the dye's local mobility, which is related to the local viscosity within the amorphous regions of polypropylene.