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Thin films of polyaniline (PANi) and PANi:titanium oxide (TiO 2 ) composites have been synthesized by sol-gel spin coating technique. The TiO 2 powder of particle size 50-60 nm was synthesized by sol-gel technique and the polyaniline was synthesized by chemical oxidative polymerization of aniline. The composite films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) Fourier transform infrared (FTIR) and UV-vis spectroscopy, and the results were compared with polyaniline films. The intensity of the diffraction peaks for PANi:TiO 2 composites is lower than that for TiO 2 . The characteristic FTIR peaks of PANi were found to shift to a higher wave number in the PANi:TiO 2 composite. These observed effects have been attributed to the interaction of TiO 2 particles with PANi molecular chains. The room temperature resistivity of polyaniline:nano-TiO 2 composite is 3.43 Â 10 3 X cm and the resistivity of pure nano-TiO 2 particles is 1.60 Â 10 6 X cm.

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In the present work, we report on effect of camphor sulfonic acid (CSA) doping on polyaniline-ZnO (50%) nanocomposites prepared by spin coating method on glass substrates. The XRD analysis revealed that the addition of CSA has no effect on crystallinity of PANi-ZnO nanocomposites. Surface morphological studies (SEM) showed that CSA has a strong effect on morphology of PANi-ZnO. The FTIR & UV-Vis spectroscopy confirmed the interaction between CSA and PANi-ZnO nanocomposite. DC electrical conductivity studies showed an increase in conductivity of PANi-ZnO nanocomposites by one order due to addition of CSA (10% -50%).