The adsorption process of 2,2':2',5″-terthiophene molecules on two different types of silver surfaces was studied by means of surface enhanced Raman scattering (SERS) and UV-Vis absorption spectroscopy. Both techniques support the hypothesis of an adsorption-induced polymerisation process of these molecules. The vibrational pattern of the chemisorbed layer was found to be almost identical with that of bulk polythiophene samples and a red shift from 3.5 to 2.5 eV of the electronic absorption is observed in agreement with the Kuhn-Kuhn model. A concomitant decrease in visible photoluminescence was also observed.
Spectroscopic evidence for adsorption-induced polymerisation of terthiophene at silver surfaces
COMPAGNINI, Giuseppe Romano;MARLETTA, Giovanni
2000-01-01
Abstract
The adsorption process of 2,2':2',5″-terthiophene molecules on two different types of silver surfaces was studied by means of surface enhanced Raman scattering (SERS) and UV-Vis absorption spectroscopy. Both techniques support the hypothesis of an adsorption-induced polymerisation process of these molecules. The vibrational pattern of the chemisorbed layer was found to be almost identical with that of bulk polythiophene samples and a red shift from 3.5 to 2.5 eV of the electronic absorption is observed in agreement with the Kuhn-Kuhn model. A concomitant decrease in visible photoluminescence was also observed.File in questo prodotto:
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