Description
Titanium dioxide (TiO2) is widely used for photocatalysis and solar cell applications, and the electronic structure of bulk TiO2 is well understood. However, the surface structure of nanoparticulate TiO2, which has a key role in properties such as solubility and catalytic activity, still remains controversial. Detailed understanding of surface defect structures may help explain reactivity and overall materials performance in a wide range of applications. In this work we address the solubility problem and surface defects control on TiO2 nanoparticles. We report the synthesis and characterization of ∼4 nm TiO2 anatase spherical nanoparticles that are soluble and stable in a wide range of organic solvents and water. By controlling the temperature during the synthesis, we are able to tailor the density of defect states on the surface of the TiO2 nanoparticles without affecting parameters such as size, shape, core crystallinity, and solubility. The morphology of both kinds of nanoparticles was determined by TEM. EPR experiments were used to characterize the surface defects, and transient absorption measurements demonstrate the influence of the TiO2 defect states on photoinduced electron transfer dynamics.
Details
Title
- Controlling Surface Defects and Photophysics in TiO2 Nanoparticles
Contributors
- Llansola Portoles, Manuel (Author)
- Bergkamp, Jesse (Author)
- Finkelstein Shapiro, Daniel (Author)
- Sherman, Benjamin (Author)
- Kodis, Gerdenis (Author)
- Dimitrijevic, Nada M. (Author)
- Gust, Devens (Author)
- Moore, Thomas (Author)
- Moore, Ana (Author)
- Department of Chemistry and Biochemistry (Contributor)
- College of Liberal Arts and Sciences (Contributor)
- School of Molecular Sciences (Contributor)
- Center for Bioenergy and Photosynthesis (Contributor)
Date Created
The date the item was original created (prior to any relationship with the ASU Digital Repositories.)
2014-11-13
Resource Type
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Identifier
- Digital object identifier: 10.1021/jp506284q
- Identifier TypeInternational standard serial numberIdentifier Value1089-5639
- Identifier TypeInternational standard serial numberIdentifier Value1520-5215
Note
- This document is the Accepted Manuscript version of a Published Work that appeared in final form in
JOURNAL OF PHYSICAL CHEMISTRY A, copyright American Chemical Society, after peer review and technical editing by the publisher.
To access the final published work, see http://pubs.acs.org.ezproxy1.lib.asu.edu/doi/abs/10.1021/jp506284q
Citation and reuse
Cite this item
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Llansola-Portoles, Manuel J., Bergkamp, Jesse J., Finkelstein-Shapiro, Daniel, Sherman, Benjamin D., Kodis, Gerdenis, Dimitrijevic, Nada M., Gust, Devens, Moore, Thomas A., & Moore, Ana L. (2014). Controlling Surface Defects and Photophysics in TiO2 Nanoparticles. JOURNAL OF PHYSICAL CHEMISTRY A, 118(45), 10631-10638. http://pubs.acs.org.ezproxy1.lib.asu.edu/doi/abs/10.1021/jp506284q