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Cited by 326

The DOI matches its Crossref record; 33 of the 33 references it cites were found in a registry or an index.

Infrared Spectra of Photoinduced Species on Hydroxylated Titania Surfaces

Szczepankiewicz, Steven H., Colussi, A. J., Hoffmann, Michael R.·2000·The Journal of Physical Chemistry B
DOI 10.1021/jp0007890
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Abstract

We detect transient and persistent diffuse reflectance infrared signals from surface intermediates generated by band gap irradiation of polycrystalline, hydroxylated TiO 2 under controlled atmospheres. Irradiation in vacuo or in the presence of CD 3 OD(ads) leads to a new absorbance at 3716 cm -1, the decline of a 3647 cm -1 band, and a reflectivity loss. Overall reflectivity, which gauges mobile charge, partially recovers in the dark after a few minutes but fully recovers upon exposure to O 2 . The 3716 cm -1 feature persists for days in a vacuum or dry O 2 but is bleached by the action of (O 2 + H 2 O + h ν). It is assigned to a Ti(III)O−H - vibration resulting from electron trapping at acidic Ti(IV)OH centers. Irradiation under O 2 yields a new band at 3683 cm -1, ascribed to surface-bound OH radicals that last indefinitely in a vacuum. None of the above events occur on thermally generated TiO 2 - γ specimens subsequently exposed to H 2 O(g). We infer that (1) O 2 is an efficient scavenger of conduction band electrons at the gas−solid interface, (2) the competition for holes between lattice oxygen photodesorption and OH - oxidation depends on gas pressure and composition, and (3) the trapped carrier buildup eventually results in extended surface reconstruction involving Ti−OH functionalities, giving rise to restructuring hysteresis.

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Metadata

Authors
Szczepankiewicz, S. H., Colussi, A. J., & Hoffmann, M. R.
Venue
The Journal of Physical Chemistry B
Publisher
American Chemical Society (ACS)
Published
2000-10-01
Volume
104
Issue
42
Pages
9842-9850
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
DOI
10.1021/jp0007890
OpenAlex
W2040310078
Cited by
326
References
33
FWCI
10.58
Type
journal article
Language
en
Open access
closed

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