Controlling surface defects and photophysics in TiO2 nanoparticles

Manuel J. Llansola-Portoles, Jesse J. Bergkamp, Daniel Finkelstein-Shapiro, Benjamin D. Sherman, Gerdenis Kodis, Nada M. Dimitrijevic, John Devens Gust, Thomas A Moore, Ana L Moore

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)10631-10638
Number of pages8
JournalJournal of Physical Chemistry A
Volume118
Issue number45
DOIs
Publication statusPublished - Nov 13 2014

Fingerprint

Surface defects
surface defects
Nanoparticles
Solubility
nanoparticles
solubility
defects
Defects
Photocatalysis
Defect structures
synthesis
titanium oxides
Surface structure
anatase
Organic solvents
Electronic structure
Paramagnetic resonance
catalytic activity
crystallinity
Catalyst activity

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Medicine(all)

Cite this

Llansola-Portoles, M. J., Bergkamp, J. J., Finkelstein-Shapiro, D., Sherman, B. D., Kodis, G., Dimitrijevic, N. M., ... Moore, A. L. (2014). Controlling surface defects and photophysics in TiO2 nanoparticles. Journal of Physical Chemistry A, 118(45), 10631-10638. https://doi.org/10.1021/jp506284q

Controlling surface defects and photophysics in TiO2 nanoparticles. / Llansola-Portoles, Manuel J.; Bergkamp, Jesse J.; Finkelstein-Shapiro, Daniel; Sherman, Benjamin D.; Kodis, Gerdenis; Dimitrijevic, Nada M.; Gust, John Devens; Moore, Thomas A; Moore, Ana L.

In: Journal of Physical Chemistry A, Vol. 118, No. 45, 13.11.2014, p. 10631-10638.

Research output: Contribution to journalArticle

Llansola-Portoles, MJ, Bergkamp, JJ, Finkelstein-Shapiro, D, Sherman, BD, Kodis, G, Dimitrijevic, NM, Gust, JD, Moore, TA & Moore, AL 2014, 'Controlling surface defects and photophysics in TiO2 nanoparticles', Journal of Physical Chemistry A, vol. 118, no. 45, pp. 10631-10638. https://doi.org/10.1021/jp506284q
Llansola-Portoles MJ, Bergkamp JJ, Finkelstein-Shapiro D, Sherman BD, Kodis G, Dimitrijevic NM et al. Controlling surface defects and photophysics in TiO2 nanoparticles. Journal of Physical Chemistry A. 2014 Nov 13;118(45):10631-10638. https://doi.org/10.1021/jp506284q
Llansola-Portoles, Manuel J. ; Bergkamp, Jesse J. ; Finkelstein-Shapiro, Daniel ; Sherman, Benjamin D. ; Kodis, Gerdenis ; Dimitrijevic, Nada M. ; Gust, John Devens ; Moore, Thomas A ; Moore, Ana L. / Controlling surface defects and photophysics in TiO2 nanoparticles. In: Journal of Physical Chemistry A. 2014 ; Vol. 118, No. 45. pp. 10631-10638.
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