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Identification of Reactive Species in Photoexcited Nanocrystalline TiO2Films by Wide-Wavelength-Range (400−2500 nm) Transient Absorption Spectroscopy
Abstract
Reactive species, holes, and electrons in photoexcited nanocrystalline TiO 2 films were studied by transient absorption spectroscopy in the wavelength range from 400 to 2500 nm. The electron spectrum was obtained through a hole-scavenging reaction under steady-state light irradiation. The spectrum can be analyzed by a superposition of the free-electron and trapped-electron spectra. By subtracting the electron spectrum from the transient absorption spectrum, the spectrum of trapped holes was obtained. As a result, three reactive species trapped holes and free and trapped electrons were identified in the transient absorption spectrum. The reactivity of these species was evaluated through transient absorption spectroscopy in the presence of hole- and electron-scavenger molecules. The spectra indicate that trapped holes and electrons are localized at the surface of the particles and free electrons are distributed in the bulk.
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Citations
Cites
Electrochemical Photolysis of Water at a Semiconductor Electrode
FUJISHIMA, A., & HONDA, K. (1972) · Nature · doi:10.1038/238037a0 · Cited by 34,169
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
O'Regan, B., & Grätzel, M. (1991) · Nature · doi:10.1038/353737a0 · Cited by 28,599
Environmental applications of semiconductor photocatalysis
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Photocatalysis on TiO2 Surfaces: Principles, Mechanisms, and Selected Results
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Cited by
TiO2 photocatalysis and related surface phenomena
FUJISHIMA, A., ZHANG, X., & TRYK, D. (2008) · Surface Science Reports · doi:10.1016/j.surfrep.2008.10.001 · Cited by 6,737
Surface Science Studies of the Photoactivation of TiO 2 New Photochemical Processes
Thompson, T. L., & Yates, J. T. (2006) · Chemical Reviews · doi:10.1021/cr050172k · Cited by 2,064
Reactive Species in Advanced Oxidation Processes: Formation, Identification and Reaction Mechanism
Wang, J., & Wang, S. (2020) · Chemical Engineering Journal · doi:10.1016/j.cej.2020.126158 · Cited by 1,585
Mechanistic Insight into the TiO2Photocatalytic Reactions: Design of New Photocatalysts
Tachikawa, T., Fujitsuka, M., & Majima, T. (2007) · The Journal of Physical Chemistry C · doi:10.1021/jp069005u · Cited by 668
Maeda, K., Teramura, K., & Domen, K. (2008) · Journal of Catalysis · doi:10.1016/j.jcat.2007.12.009 · Cited by 295
Metadata
- Authors
- Yoshihara, T., Katoh, R., Furube, A., Tamaki, Y., Murai, M., Hara, K., Murata, S., Arakawa, H., & Tachiya, M.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-02-28
- Volume
- 108
- Issue
- 12
- Pages
- 3817-3823
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2027395781
- Cited by
- 499
- References
- 4
- FWCI
- 10.17
- Type
- journal article
- Language
- en
- Open access
- closed
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- Yoshihara, T., Katoh, R., Furube, A., Tamaki, Y., Murai, M., Hara, K., Murata, S., Arakawa, H., & Tachiya, M. (2004). Identification of Reactive Species in Photoexcited Nanocrystalline TiO2Films by Wide-Wavelength-Range (400−2500 nm) Transient Absorption Spectroscopy. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp031305d
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