Back electron transfer from TiO2 particles to FeIII(CN)63-: origin of non-single-exponential and particle size independent dynamics

Article Abstract:

Issues concerning the use of ultrafast pump probe spectroscopy to study back-electron transfer dynamics in FeII(CN)64- sensitized nanoparticles of colloidal TiO2 are presented.

Chemistry, Physical and theoretical, Physical chemistry, Chemical reaction, Rate of, Chemical kinetics, Dynamics of a particle, Particle dynamics

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Interfacial electron transfer between Fe(II)(Cn)6(super 4-) and TiO2 nanoparticles: direct electron injection and nonexponential recombination

Article Abstract:

A study was conducted to analyze photoinduced electron-transfer dynamics in Fe(II)(CN)6(super 4-) sensitized TiO2 nanoparticles in D2O solutions. Subpicosdecond tunable laser spectroscopy was carried out in the mid-infrared and visible regions. The mid-infrared absorption of electrons in the semiconductor was analyzed to examine the properties of the injected electrons. Results indicated that nonexponential recombination correlated with the spatial and energetic distribution of trap states for the injected electrons in the nanoparticles.

Semiconductors, Laser spectroscopy

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Dynamics of electron injection in nanocrystalline titanium dioxide films sensitized with (Ru(4,4'-dicarboxy-2,2'-bipyridine)2(NCS)2) by infrared transient absorption

Article Abstract:

A study was conducted to analyze the injection of electrons into nanocrystalline TiO2 film electrodes under ambient environments using femtosecond pump-probe spectroscopy. Degussa P25 TiO2 was utilized as the starting material to prepare titanium dioxide nanoparticle colloids. Results indicated an upper limit on the electron injection time of about 50 fs. In addition, the injection time supported the ultrafast injection process in a dye-sensitized semiconductor system.

Colloids, Electrodes, Semiconductor films

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