Spectral and microscopic examinations of metalloporphyrin-labelled polymers on different substrates
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The topography of quartz and semiconducting (In2O3 and SnO2) surfaces coated with a dye-polymer layer was investigated with optical microscopy and scanning force microscopy. The following macromolecular systems were used in the experiments: copper or zinc porphyrins covalently linked to polyethylene glycol (PEG) or polyisopropylacrylamide (PNIPAM) polymers. It was shown that images of the surface topography are closely connected with the relation between the magnitude of substrate grains and geometrical size of the dye-polymers. The dye-polymer layer, based on the PNIPAM polymer, shows a ring-like structure, whereas the sample based on the PEG polymer is characterized by a longitudinal dendritic topography. When the dye-polymer layer was deposited on the surface, absorption spectroscopy in polarized light was used to determine dye orientation with respect to the substrate surface. The tilt angle between the dye layer and substrate was estimated. A correlation between the substrate surface topography and the molecular arrangement of dyes is also discussed.
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