Synthesis and Characterization of TiO2 and SnO2 Doped Polypyrrole Nano Composites

Abstract

Polypyrrole and its nano-composites are synthesized using in-situ chemical oxidative polymerization technique using pyrrole monomer. Crystalline nano sized TiO2 & SnO2 are embedded in amorphous Polypyrrole in 10% by weight. Ammonium Per Sulphate is used as oxidizing agent for polymerization. The structure of composites was confirmed by the characterization techniques XRD, FTIR and UV Visible spectra. Average particle size and chain separation is determined from XRD. UV-Visible studies show that the composites exhibit absorption peaks at 678 nm and 267 nm; for PPy/TiO2 which corresponds to band gap energies 1.836 eV and 4.663 eV respectively. The PPy/SnO2 doped Polypyrrole nano composite exhibits absorption peaks at 996 nm, 914 nm, 804 nm, 652 nm & 586 nm which corresponds to band gap energies 1.25 eV, 1.36 eV, 1.548 eV, 1.9 eV and 2.12 eV respectively.