Abstract
Electron transfer dynamics of meso-tetrakis( p-carboxyphenyl)porphyrin [TCPP] adsorbed on colloidal TiO 2 and AuTiO 2 nanoparticles have been investigated by time resolved absorption and fluorescence spectroscopy. Optical absorption studies reveal that the TCPP form complex with TiO 2 and AuTiO 2 nanoparticles. Excitation of TCPP adsorbed on the TiO 2 nanoparticle surface leads to electron injection on the conduction band of TiO 2. Electron injection has been confirmed by direct detection of cation radical of the adsorbed dye (TCPP +). The rate constant for the electron injection process is determined from both the singlet and triplet state respectively. The rate of electron injection for TCPP–AuTiO 2 is much faster than TCPP–TiO 2. The injected electrons are quickly transferred to Au and it escorts to ignore the back electron transfer (recombination) process.
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