Conducting polyaniline doped with zinc tungstate matrix film as gas sensing composite

Conducting polyaniline (PANI) is doped with a bi-metal oxide, Zinc tungstate (ZnWO4) in the chemical polymerization method, and the composite matrix is sintered on the substrate to form a film. The characterization of composite by FTIR spectrum to confirm the formation of emeraldine salt phase of PANI from monomer aniline. X-RD spectra and SEM images to confirm the presence of crystalline ZnWO4 in PANI matrix. The difference in conductivity versus temperature shows exponentially thermal activated behavior, in which conductivity increases with temperature due to the curling effect of polymer composite. When exposed to liquid petroleum gas (LPG), due to depletion in the number of conduction electrons at the surface and grain boundaries, there is a barrier formation at the interface of sensing films of PANI/ZnWO4 composite, via Fermi energy exchange control mechanism, thereby composite film increases its resistance with LPG concentration.