Preparation, Characterization and Chemical Sensing Properties of Polyaniline Thin Films

Novel chemical sensor was fabricated by forming the thin films of conducting polyaniline on glass substrates using spin coating technique. Structural and morphological characterizations of spin coated polyaniline (PANI) thin film were carried out using X-Ray Diffractometer (XRD) and Field Emission Scanning Electron Microscope (FE-SEM), respectively. The functional group present in the polyaniline thin film was confirmed using FTIR spectrometer. Sensing performance of the prepared film was studied. The resistance of the polyaniline thin film was reduced from 109-107 ohms towards the 25 ppm concentration level of ammonia at room temperature.