Observation of pH-dependent back-electron-transfer dynamics in alizarin/TiO(sub 2) adsorbates: Importance of trap states

Article Abstract:

An investigation was carried out of alizarin-sensitized TiO(sub 2) colloid nanoparticles in solution at pH 2 and 9 by means of steady-state and subpicosecond time-resovled spectroscopic methods. The significant decrease of the excited-state lifetime in the water-ethanol mixture at pH 9 in comparision to that of alizarin in ethanol was attributed to intramolecular hydrogen bond formation with the aqueous solvent, which promotes the fast deactivation of the excited state.

Analysis, Electron transport, Titanium dioxide, Chemical properties, Atomic properties, Alizarin, Nanoparticles

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Direct observation of ultrafast electron injection from Coumarin 343 to TiO2 nanoparticles by femtosecond infrared spectroscopy

Article Abstract:

A study was conducted to determine the transient infrared absorption of injected electrons in colloidal TiO2 nanoparticles by femtosecond infrared spectroscopy. A femtosecond infrared spectrometer based on an amplified femtosecond Ti:sapphire laser system was utilized to carry out the spectroscopy studies. Results indicated that the direct detection of injected electrons support unambiguous determine of electron injection processes.

Research, Usage, Nanotechnology, Colloids, Infrared spectroscopy, Electrons

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