Adsorption dynamics of the N719 dye on nanoporous titanium oxides studied by resonance Raman scattering and Fourier transform infrared spectroscopy

摘要

The adsorption dynamics of the (Bu _4N) _2[Ru(dcbpyH) _2(NCS) _2] (N719) dye on nanoporous TiO _2 films were examined. Resonant Raman scattering and Fourier transform infrared absorption spectroscopy were used to study TiO _2 thin films that had been sensitized in ethanol solutions for different immersion times. Our experimental results suggested that the N719 dyes were anchored to the surface of nanoporous TiO _2 through bidentate chelating or bridging forms between the carboxylate groups of the N719 dyes and the TiO _2 at all stage of adsorption, while the strength of intermolecular π-π interactions between adjacent bipyridine rings became stronger as the density of the adsorbed dyes increased.