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EPR Investigation of TiO2 Nanoparticles with Temperature-Dependent Properties
Abstract
An in situ electron paramagnetic resonance (EPR) study has been carried out for anatase (Hombikat UV100) and rutile TiO(2) nanoparticles at liquid helium (He) temperature (4.2 K) under UV irradiation. Rutile titania was synthesized by ultrasonic irradiation with titanium tetrachloride (TiCl(4)) as the precursor. XRD and Raman results evidence the crystallinity of titania phases. The nature of trapped electrons and holes has been investigated by EPR spectroscopy under air and vacuum conditions. Illumination of TiO(2) powder (anatase and rutile) at 4.2 K resulted in the detection of electrons being trapped at Ti(4+) sites within the bulk and holes trapped at lattice oxide ions at the surface. The stability of electron traps was very sensitive to temperature in both phases of TiO(2). The annealing kinetics of the EPR detected radicals has been studied from 4.2 K to ambient temperature and also for calcined titania particles from 523 to 1273 K.
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Cites
Environmental applications of semiconductor photocatalysis
Hoffmann, M. R., Martin, S. T., Choi, W., & Bahnemann, D. W. (1995) · Chemical Reviews · doi:10.1021/cr00033a004 · Cited by 18,495
Explaining the Enhanced Photocatalytic Activity of Degussa P25 Mixed-Phase TiO 2 Using EPR
Hurum, D. C., Agrios, A. G., Gray, K. A., Rajh, T., & Thurnauer, M. C. (2003) · The Journal of Physical Chemistry B · doi:10.1021/jp0273934 · Cited by 2,015
Cited by
Black TiO2 Nanotubes: Cocatalyst-Free Open-Circuit Hydrogen Generation
Liu, N., Schneider, C., Freitag, D., Hartmann, M., Venkatesan, U., Müller, J., Spiecker, E., & Schmuki, P. (2014) · Nano Letters · doi:10.1021/nl500710j · Cited by 462
Metadata
- Authors
- Kumar, C. P., Gopal, N. O., Wang, T. C., Wong, M.-S., & Ke, S. C.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2006-02-22
- Volume
- 110
- Issue
- 11
- Pages
- 5223-5229
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W2049305800
- Cited by
- 347
- References
- 2
- FWCI
- 6.14
- Type
- journal article
- Language
- en
- Open access
- closed
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- Kumar, C. P., Gopal, N. O., Wang, T. C., Wong, M.-S., & Ke, S. C. (2006). EPR Investigation of TiO2 Nanoparticles with Temperature-Dependent Properties. The Journal of Physical Chemistry B. https://doi.org/10.1021/jp057053t
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