Abstract
The influence of post treatments on the optical absorption, morphology and electrical conductivity of galvanostatically synthesized poly( O-methoxyaniline) (POMA) thin films has been investigated. For post treatment studies, the films were treated with distilled water, supporting electrolyte and NaOH. With water treatment, the optical absorption spectrum shows the formation of pernigraniline base (PB) along with emeraldine salt (ES) phase of POMA, whereas the supporting electrolyte treatment does not indicate any major changes except decrease in the overall absorbance level with the simultaneous increase in the sharpness of the peak at ∼780 nm as compared to the as-deposited films. After the NaOH treatment, the spectrum exhibits significant changes and shows a single well-defined peak at ∼540 nm corresponding to the PB. The Fourier transform infrared (FTIR) spectra exhibit systematic spectral changes with the post treatments. The FTIR spectroscopic study reveals the formation of PB upon NaOH treatment and supports the optical absorption spectroscopy results. It is found that the post treatments affect the electrical conductivity. The surface morphology of the films is also strongly influenced by the post treatments.
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