Abstract
The planar conformation assumed by polyfluorenes is used as a model system to investigate how solid surfaces interact with an individual polymer chain as well as to access the effects of substrates and interchain interactions on the polymer conformation. We demonstrate that confocal fluorescence microscopy is very sensitive to characterize photophysical processes associated to conformation assumed by a single conjugated unit of poly (9,9 dioctylfluorene) or PFO. Emissions from interacting molecules have been resolved for the first time between the energies of the planar (β phase) and the non-planar (amorphous) phase that were associated to perturbations of the primary chain conformation. But we have found the planar conformation is assumed by single PFO molecules due to strong interactions with the hydrophilic quartz surfaces. This PFO conformation persists frozen even at room temperature, although emission lines are significantly broadened due to interactions with vibrating substrate atoms.
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