Fabrication, Characterization, and Gas Sensing Properties of CaMnO₃ Doped Polyaniline Nano Composite Thin Films

Abstract

Porous CaMnO3 doped polyaniline nano composite thin films were synthesized by the doping CaMnO3 by weight percentage (5%, 10%, 15%, 20%, and 25%) in aqueous solution of polyanline using chemical polymerization technique. The produced films were characterized by X-ray diffraction (XRD), UV-Visible spectroscopy, Infrared spectroscopy (IR), scanning electron microscope (SEM), d.c electrical conductivity, and dielectric constant measurements. The optical properties of all investigated films were studied, where the optical absorption of the prepared films decreases with increasing the amount of CaMnO3 in both VIS (500–700 nm) and UV (200–400 nm) regions. The increase in conductivity with increase in concentration of CaMnO3 has been observed in CaMnO3 doped polyaniline composites. The H2S gas was used to study the gas sensing behavior of investigated films.