Madridge J Anal Sci Instrum. ISSN: 2638-1532 21 Volume 2 • Issue 1 • 1000105 Madridge Journal of Analytical Sciences and Instrumentation Research Article Open Access Effect of Solvent Polarity on Fluoroscence Spectra of Camphor Sulphonic Acid Doped Polyaniline Lakshmidevi V 1 , Parvathi P 1 and Venkataraman A 1,2 * 1 Materials Chemistry Laboratory, Department of Materials Science, Gulbarga University, Kalaburagi- 585106, Karnataka, India 2Department of Chemistry, Gulbarga University, Kalaburagi- 585106, Karnataka, India Article Info *Corresponding author: Venkataraman A Department of Chemistry Gulbarga University kalaburagi-585106 Karnataka, India Email: raman.dms@gmail.com Received: January 9, 2017 Accepted: January 24, 2017 Published: January 27, 2017 Citation: Lakshmidevi V, Parvathi P, Venkataraman A. Effect of Solvent Polarity on Fluoroscence Spectra of Camphor Sulphonic Acid Doped Polyaniline. Madridge J Anal Sci Instrum. 2017; 2(1): 21-24. doi: 10.18689/mjai-1000105 Copyright: © 2017 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 International License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Published by Madridge Publishers Abstract 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. Keywords: Conducting Polymer; PANi; Dipole Moment; Fluorescence; Stokes Shift; Solvatochromic Shift. Introduction Conducting polymers were considered as the futuristic new materials that would lead to the next generation of electronics and optoelectronics devices. Among all conducting polymers PANi and its derivatives have attracted much attention worldwide because of chemical stability, simple preparation and high conductivity, low ionization potential, high electron affinity and the ability to be oxidized or reduced more reversibly than conventional polymer [1-3]. PANi has extended π-electron delocalization, which is responsible forfluorescence emission and it is a fluorescent conjugated polymer. The photoluminescence of PANiemeraldine salt was reported by Gong etal [4]. The extended conjugation also leads to intermolecular hydrogen bonds between the amine and imine group of the adjacent chain and pi stacking. Hence the polymer chain becomes rigid which induces insolubility and infusibility to the polymer chain. The processability of PANi can be improved by using functionalized dopants like CSA or DBSA which was first reported by Cao. et al [5]. The bulky dopants will reduce the mutual aggregation by increasing the solubility of PANisalt in non-polar and weakly polar solvent. In recent years considerable effort has been made to design and to synthesize functional molecule that could serve as sensitive sensors for the analytical detection of chemically and biologically important ionic species. Fluorescence sensors have received a considerable attention for their potential applications to biochemical and medical analysis. The effect of solvents on spectral properties of molecules generally referred as solvatochromism has been investigated [6]. The study of solvent effects on fluorophore ISSN: 2638-1532