Preparation and Characterization of Polyaniline Nano Fiber Thin Film Deposited by Oxidative Polymerization Technique on Glass and ITO for Ammonia Gas Sensor Application

¹ Nanotechnology and Advanced Materials Research Center, University of Technology, Baghdad, Iraq
² College of Production Engineering & Metallurgy, University of Technology-Iraq, Baghdad 10066, Iraq

Published online: 24 June 2026

Abstract

The polyaniline nano fiber was deposited on glass and ITO by simple and economic oxidative polymerization technique. The thickness of PANI Nano fiber deposited on glass and ITO found to be 190 nm and 210 nm respectively which are measured by gravimetric weight difference method. The XRD study shows the amorphous nature of both the films with decrease in intensity for PANI deposited on ITO. SEM micrograph shows that PANI is deposited uniformly and no more change was observed. FTIR study represents the formation of PANI emeraldine salt, whereas, the optical absorbance spectra indicates three characteristic peaks with higher intensity of absorption in case of PANI deposited on ITO. The DC electrical resistivity of PANI deposited on glass and ITO was investigated by home made two probe resistivity set up and the resistivity was found to be 5.49×10⁶ Ω.cm for PANI deposited on glass and 1.96×10³ Ω.cm PANI deposited on ITO. Furthermore, the ammonia gas sensing study of as deposited PANI thin film was investigated by gas sensor system with different concentration of gas and higher sensitivity i.e.17.7% found to be for 100 ppm of Ammonia gas also the response and recovery time found to be 24 sec and 26 sec respectively.