Photosensitization of Colloidal TiO2 with ZnTPP and Pyrene
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A. Kathiravan
The interaction of Zinc(II) tetraphenyl porphyrin (ZnTPP) and pyrene with colloidal TiO2 was studied by absorption and fluorescence spectroscopy. Upon excitation of its absorption band, the fluorescence emission of ZnTPP and pyrene was quenched by colloidal TiO2. The bimolecular quenching rate constant (kq) is 4.09 × 1011 M−1s−1 for ZnTPP and 2.09 × 109 M−1s−1 for pyrene. ZnTPP and pyrene adsorbed on colloidal TiO2 can participate in the sensitization process by injecting electrons from their excited states into the conduction band of TiO2. The mechanism is discussed on the basis of free energy change (ΔGet) obtained from Rehm-Weller equation considering quenching rate constants and conduction band potential of colloidal TiO2.
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Artikel in diesem Heft
- Quantum Thermodynamics of the Spontaneous Approach to the Equilibrium State – Irreversible Exponential Decay of a Discrete Quantum State of Entropy Production into a Continuum
- Preparation and Characterization of Mn0.4NixZn0.6−xFe2O4 Soft Spinel Ferrites for Low and High Frequency Applications by Citrate Precursor Method
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- Mechanistic Studies on the Nucleation of Zinc Sulphide Nanoparticles by Means of XAFS Spectroscopy
- Surface Analysis of Nanoscale Aluminium and Silicon Films Made by Electrodeposition in Ionic Liquids
- Computing Activity Coefficients of Binary Lennard-Jones Mixtures by Gibbs-Duhem Integration
- Electronic Spectra of Hydrogen-Bonded Self and Water Complexes of Indazole
