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- W2020698009 abstract "The inhomogeneous interfacial electron transfer (IET) dynamics of 9-phenyl-2,3,7-trihydroxy-6-fluorone (PF)-sensitized TiO2 nanoparticles (NPs) has been probed by a single-molecule photon-stamping technique as well as ensemble-averaged femtosecond transient absorption spectroscopy. The forward electron transfer (FET) time shows a broad distribution at the single-molecule level, indicating the inhomogeneous interactions and ET reactivity of the PF/TiO2 NP system. The broad distribution of the FET time is measured to be 0.4 ± 0.1 ps in the transient absorption and picoseconds to nanoseconds in the photon-stamping measurements. The charge recombination time, having a broad distribution at the single-molecule level, clearly shows a biexponential dynamic behavior in the transient absorption: a fast component of 3.0 ± 0.1 ps and a slow component of 11.5 ± 0.5 ns. We suggest that both strong and weak interactions between PF and TiO2 coexist, and we have proposed two mechanisms to interpret the observed IET dynamics. A single-molecule photon-stamping technique and ensemble-averaged transient absorption spectroscopy provide efficient “zoom-in” and “zoom-out” approaches for probing the IET dynamics. The physical nature of the observed multiexponential or stretched-exponential ET dynamics in the ensemble-averaged experiments, often associated with dynamic and static inhomogeneous ET dynamics, can be identified and analyzed by single-molecule spectroscopy measurements." @default.
- W2020698009 created "2016-06-24" @default.
- W2020698009 creator A5058849663 @default.
- W2020698009 creator A5076944433 @default.
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- W2020698009 date "2010-01-05" @default.
- W2020698009 modified "2023-10-17" @default.
- W2020698009 title "Combined Single-Molecule Photon-Stamping Spectroscopy and Femtosecond Transient Absorption Spectroscopy Studies of Interfacial Electron Transfer Dynamics" @default.
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- W2020698009 doi "https://doi.org/10.1021/ja909168e" @default.
- W2020698009 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/20050658" @default.
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