EFFECT OF PH ON THE OPTICAL - ABSORPTION OF POLYANILINE THIN FILMS PREPARED BY ELECTROCHEMICAL POLYMERIZATION ON ITO GLASS

This paper reports the experimental attempt toward deposition of Polyaniline (PANI) using electrochemical deposition technique to study the optical absorption of PANI thin films deposited at different pH values of aniline solution. The optical absorption measurements were carried out in order to estimate the energy band gap of the electrodeposited PANI layers on ITO glass slides. It was observed that as the pH of aniline solution decreases from 5 to 2, the optical band gap values decreases from 3.92 to 2.2 eV. This confirms the polaron band transition in Polyaniline synthesized using the aniline solution of pH = 2.