Abstract
Abstract Among the conducting polymers, polypyrrole (PPY) has drawn a lot of interest due to its excellent environmental stability, ease of preparation and high conductivity. Here we have used chemical oxidative polymerization to synthesize PPY from its monomer pyrrole. We have studied morphological and optical properties of PPY samples by varying the monomer to oxidant molar ratio as 1:1.25 and 1:2 and denoted the samples by 1125ppy and 1200ppy respectively. The prepared samples are characterized by FTIR, UV-Vis, photoluminescence (PL) spectroscopy and FESEM. FTIR spectra reveal the required functional groups that should be present in PPY. From UV-Vis spectra, it is clear that the band gap of PPY changes due to the variation of monomer to oxidant ratio. There are two major absorption bands among which one is at about 350 nm for both the samples due to π-π* transition and another absorption band is at about 600nm for 1125ppy due to polaron band transition. The polaron band transition for 1200ppy is observed at about 650 nm. This redshift is due to the increased extent of oxidation induced by increasing the amount of oxidant. From the FESEM image, it is observed that agglomeration of particles increases with thedecreased monomer to oxidant ratio. As the ratio decreases the rate of oxidation increases and more cross-linked structure of polypyrrole is formed which resultsin more agglomerated structure. PL Spectra shows that 1125ppy has higher PL intensity than that of 1200ppy. Since agglomeration quenches PL intensity, the process is supported by our SEM results. So, PL intensity decreases with decreasing monomer to oxidant ratio
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