Multilayer Self-Assembly of TiO<sub>2</sub> Nanoparticles and Polyaniline-<i>Grafted</i>-Chitosan Copolymer (CPANI) for Photocatalysis

A photocatalytic thin film of TiO<sub>2</sub> nanoparticles and polyaniline-<i>grafted</i>-chitosan (CPANI) was fabricated by layer-by-layer (LbL) approach. The growth of the self-assembly of polymer nanocomposite was monitored by UV−vis spectroscopy and the thin film morphology was analyzed from scanning electron microscopy (SEM). Poly(styrene sulfonate) (PSS) was used as a bridging layer between TiO<sub>2</sub> nanoparticles and CPANI. Incorporation of CPANI within the LbL self-assembly of polymer nanocomposites enhanced the dye degradation ability of the thin film. These results indicate that the presence of CPANI improves the adsorption of dye in the self-assembly. The effect of surface area and the amount of catalyst was also examined. The reusability of the thin films for dye degradation study ensures the stability of the self-assembly.