A Effect of Annealing on Physicochemical, Optoelectronic and Gas Sensing Properties of Polyaniline Thin Films
Keywords:
Thin films, polymer, polaron, compositional modifications, sensorAbstract
The present article describes about synthesis of polyaniline thin films by soft chemical solution polymerization method at room temperature over glass substrate and effect of air annealing at 100, 200 and 300oC on the physicochemical and optoelectronic properties intending to characterize as gas sensing materials. The as deposited and annealed thin films characterized for compositional, elemental, surface morphology, optical properties and electrical properties along with ammonia gas sensing applications. Slight shift in peaks positions from 1167, 1372, 1506 and 1593 cm-1 and broadening of peak with increase in intensity recorded on Fourier transform infra-red (FTIR) spectra confirm annealing induced elemental variations, while Raman spectrum represents chemical bond shifting upon annealing polyaniline thin films which can be inferred as compositional modifications upon annealing. Fatty granular appearing surface morphology obtained in atomic force microscopy (AFM) found to be coalesces into smaller granular shapes on post deposition treatments which can also be confirmed from the scanning electron microscopy (SEM) images. Optical absorbance shows shift in absorbance peaks corresponding for excitation of polaron band which observed to be red shifted may be correlated to polygonization process i.e. absorbance of energy at the surface and utilizing in materials modifications. The ammonia gas sensing characteristics have represented the increase in gas response upto 85% for the sample annealed at 200oC The response and recovery time is observed to be lower than the as deposited and 300C annealed samples, this can be correlated to the fact of structural saturations at moderate annealing.
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