Time-dependent behavior of active oxygen species formed on photoirradiated TiO2 films in air
Article Abstract:
The longevity of active oxygen species established on TiO2 film catalysts were studied under strong UV light irradiation. Two oxygen species were discovered to have formed, one with a shorter lifetime of ca. 3 s and another with ca. 50 s. The ca. 50 s species can be considered a superoxide (O2-). Under low intensity UV light irradiation conditions, only the long-lived species were detected and were highly concentrated on the TiO2 surface. It is postulated that the deactivation of O2- is caused by surface defects or vacant sites on the surface of TiO2 films.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1998
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Quantitative evaluation of the photoinduced hydrophilic conversion properties of TiO2 thin film surfaces by the reciprocal of contact angle
Article Abstract:
The kinetics on the photoinduced hydrophilic conversion processes of the TiO2 surface is studied. The results show that the photoinduced hydrophilic conversion proceeds competitively with the photocatalytic oxidation process under UV radiation.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2003
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Generation and deactivation processes of superoxide formed on TiO2 film illuminated by very weak UV light in air or water
Article Abstract:
It has been possible to identify the active oxygen species remaining on the TiO2 surface after weak UV light illumination. The quantum yield of its generation at the air-TiO2 interface and at the water-TiO2 interface was estimated.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2000
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