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Abstract
Polyaniline (PANI) was synthesized by chemical oxidation polymerization in the presence of ammonium persulfate as oxidant and different concentration of organic acids. In this study, fluorescence characteristics of polyaniline doped with different concentration of organic acids is soluble in DMF in terms of fluorescence quenching are discussed. The emission spectra of all the polymers solutions were noticed to be a mirror image of the excitation spectra. Upon photo excitation of a conjugated polymer, the electrons from the valence band are excited to the conduction band and then migrated along the polymer backbone. In solution, the quencher and the polymer form a weak complex. This static association prevents the transfer of electron on the conjugated chain, or induces ultra fast photo induced electron transfer to electron acceptor, resulting decrease of fluorescent intensity of conjugated polymer. It has been observed that as the concentration of dopant increases the fluorescence intensity decreases. The intensity of the fluorescence peaks seems to increase as the dopant concentration is increased which suggests that the density of states in the dopant induced energy band increases with dopant concentration.
Published Version
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