Effect of solvent polarity on fluoroscence spectra of camphor Sulphonic acid doped Polyaniline

The Camphor sulphonic acid doped polyaniline (CSA-PANi)is synthesized by chemical polymerization method and then characterized by using UV-Visible and FTIR. The surface morphology is studied by SEM and AFM techniques. The degree of crystallinity of PANiis studied by XRD and redox behaviour by cyclic voltametry. Thermal stability of the doped polymer is investigated by TGA and DSC.The fluorescence emission spectra of CSA-PANiare investigated in different solvents such as dimethyl formamide(DMF), dimethyl sulphoxide (DMSO) and N-methyl-2-pyrrolidone (NMP).The fluorescence intensity decreases with increase of solvent polarity. A fluorescence study reveals that the nature (blue or red shift) and amount of the shifts of PANi depends on the solvents used. The significance of present study evolves a trend in solvatochromic shifts of PANi in different solvents.