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Dynamics of Localized Charges in Dopamine-Modified TiO2 and their Effect on the Formation of Reactive Oxygen Species
Abstract
Modification of TiO(2) nanoparticles with dopamine enables harvesting of visible light and promotes spatial separation of charges. The formation of reactive oxygen species (OH, (1)O(2), O(2)(-), HO(2), H(2)O(2)) upon illumination of TiO(2)/dopamine was studied using complementary spin-trap EPR and radical-induced fluorescence techniques. The localization of holes on dopamine suppresses oxidation of adsorbed water molecules at the surface of nanoparticles, and thus formation of OH radicals. At the same time, dopamine does not affect electronic properties of photogenerated electrons and their reaction with dissolved oxygen to produce superoxide anions. Superoxide anions are proposed to generate singlet oxygen through dismutation reaction, resulting in a low yield of (1)O(2) detected.
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Physical Mechanisms of Generation and Deactivation of Singlet Oxygen
Schweitzer, C., & Schmidt, R. (2003) · Chemical Reviews · doi:10.1021/cr010371d · Cited by 2,123
Symposium‐in‐Print: Singlet Oxygen Invited Review
Redmond, R. W., & Kochevar, I. E. (2006) · Photochemistry and Photobiology · doi:10.1562/2006-04-14-ir-874 · Cited by 421
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Nosaka, Y., & Nosaka, A. Y. (2017) · Chemical Reviews · doi:10.1021/acs.chemrev.7b00161 · Cited by 4,771
Zhang, G., Kim, G., & Choi, W. (2014) · Energy & Environmental Science · doi:10.1039/c3ee43147a · Cited by 470
Coupling Piezocatalysis and Photocatalysis in Bi4NbO8X (X = Cl, Br) Polar Single Crystals
Hu, C., Huang, H., Chen, F., Zhang, Y., Yu, H., & Ma, T. (2020) · Advanced Functional Materials · doi:10.1002/adfm.201908168 · Cited by 367
Multifunctional nanoparticles for brain tumor imaging and therapy
Cheng, Y., Morshed, R. A., Auffinger, B., Tobias, A. L., & Lesniak, M. S. (2014) · Advanced Drug Delivery Reviews · doi:10.1016/j.addr.2013.09.006 · Cited by 349
Titanium Dioxide in the Service of the Biomedical Revolution
Rajh, T., Dimitrijevic, N. M., Bissonnette, M., Koritarov, T., & Konda, V. (2014) · Chemical Reviews · doi:10.1021/cr500029g · Cited by 293
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Metadata
- Authors
- Dimitrijevic, N. M., Rozhkova, E., & Rajh, T.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2009-02-11
- Volume
- 131
- Issue
- 8
- Pages
- 2893-2899
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2026265859
- Cited by
- 182
- References
- 2
- FWCI
- 4.36
- Type
- journal article
- Language
- en
- Open access
- closed
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- Dimitrijevic, N. M., Rozhkova, E., & Rajh, T. (2009). Dynamics of Localized Charges in Dopamine-Modified TiO2 and their Effect on the Formation of Reactive Oxygen Species. Journal of the American Chemical Society. https://doi.org/10.1021/ja807654k
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