Abstract
Polypyrrole (PPy) was synthesized by chemical oxidative polymerization technique using monomer pyrrole and ammo-nium persulphate as an oxidant in a ratio of 1:1. Thin films of polypyrrole were prepared by dissolving polypyrrole in mcresol and cast using spin coating technique on glass substrates. Thin films of polypyrrole were characterized by X ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infra red spectroscopy (FTIR), UV visible spectroscopy and electrical resistivity by four probe method. The XRD spectra showed that the polypyrrole is amorphous in nature. SEM studies revealed a uniform granular structure of PPy. The FTIR spectra shows that the presence of all characteristics absorption peaks of polypyrrole that is, 890 cm?1 (=C–H out-of-plane vibration), 1040 cm?1 (=C–H in-plane vibration), 1170 cm?1 (N–C stretch bending) and 1410 cm?1 (pyrrole ring vibration). UV visible study shows PPy films exhibit absorption peak at 446 nm (2.77 eV). Room temperature electrical resistivity of PPy is in the critical regime of the metal –to –insulator (M-I) transition.
Highlights
In recent years, intrinsic conducting polymers with conjugated double bonds have been attracted much attention as advanced materials
Thin films of polypyrrole were characterized by X ray diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infra red spectroscopy (FTIR), UV visible spectroscopy and electrical resistivity by four probe method
The FTIR spectra shows that the presence of all characteristics absorption peaks of polypyrrole that is, 890 cm–1 (=C–H out-of-plane vibration), 1040 cm–1 (=C–H in-plane vibration), 1170 cm–1 (N–C stretch bending) and 1410 cm−1
Summary
Intrinsic conducting polymers with conjugated double bonds have been attracted much attention as advanced materials. Among those conducting polymers, polypyrrole (PPy) is especially promising for commercial applications because of its good environmental stability, facile synthesis and higher conductivity than many other conducting polymers. The electrochemical process parameters affecting the properties of the PPy coatings are investigated [14]. Synthetically conductive PPy is insoluble and infusible which restricts its processing and applications in other fields. PPy-based polymers can be used to load and release drugs and biomolecules [15]. PPy-based polymer blends can protect the corrosion of metals [16]. In the present investigations attempts were made to report on our observation of structure morphology, electrical and optical properties of polypyrrole thin films using the spin coating technique
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