Proceedings of International Conference on Applied Innovation in IT
2026/03/31, Volume 14, Issue 1, pp.433-439

Cold Plasma Effect on Optical Properties of Polypyrrole Thin Films


Hadeer Kamel and Hamid H. Murbat


Abstract: Electrochemical deposition of polypyrrole (PPy) thin films was performed on indium tin oxide (ITO) glass substrates using potassium nitrate (KNO₃) as the supporting electrolyte. Extensive surface modifications of the conductive polymers were then performed by cold plasma treatment (using a DBD plasma device) at various time points (0, 5, 10, 15, and 20 minutes). Polypyrrole is a self-conducting polymer that undergoes radical structural and chemical changes in the presence of plasma. This work aimed to investigate the changes in polypyrrole (PPy) films using Fourier transform infrared (FTIR) spectroscopy, focusing on the use of oxygen-containing groups, changes in C=C and C-N vibrations, and UV-vis spectroscopy. Optical tests were also performed to measure the energy gap at different time points, in addition to the overall effect of cold plasma on the surface activity/conductivity of polypyrrole. These results indicate that plasma treatment is an effective post-treatment tool for improving the functional properties of electrochemically synthesized polypyrrole membranes and their potential applications in sensors, energy storage systems, and optoelectronics.

Keywords: Polypyrrole, FTIR, Cold plasma, Electrochemical, UV-Vis.

DOI: Under indexing

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