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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2006
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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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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