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• W1973179627 startingPage "3393" @default.
• W1973179627 abstract "By comparing the transient absorption spectra of nanosized anatase TiO2 colloidal systems with and without SCN−, the broad absorption band around 520 nm observed immediately after band-gap excitation for the system without SCN− has been assigned to shallowly trapped holes. In the presence of SCN−, the absorption from the trapped holes at 520 nm cannot be observed because of the ultrafast interfacial hole transfer between TiO2 nanoparticles and SCN−. The hole and electron trapping times were estimated to be <50 and 260 fs, respectively, by the analysis of rise and decay dynamics of transient absorption spectra. The rate of the hole transfer from nanosized TiO2 colloid to SCN− is comparable to that of the hole trapping and the time of formation of a weakly coupled (SCN···SCN)•− is estimated to be ∽2.3 ps with 0.3 M KSCN. A further structural change to form a stable (SCN)2•− is observed in a timescale of 100∽150 ps, which is almost independent of the concentration of SCN−." @default.
• W1973179627 created "2016-06-24" @default.
• W1973179627 creator A5002137973 @default.
• W1973179627 creator A5053940979 @default.
• W1973179627 date "2001-01-01" @default.
• W1973179627 modified "2023-09-27" @default.
• W1973179627 title "How fast is interfacial hole transfer? In situ monitoring of carrier dynamics in anatase TiO2 nanoparticles by femtosecond laser spectroscopy" @default.
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• W1973179627 doi "https://doi.org/10.1039/b101721g" @default.
• W1973179627 hasPublicationYear "2001" @default.
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