Evidence for oxygen adatoms on TiO2 (110) resulting from O2 dissociation at vacancy sites
Annealing TiO2 (110) in vacuum at high temperature (above about 800K) generates oxygen
vacancy sites that are associated with reduced surface cations. Numerous studies have
shown that these sites can be oxidized by exposure to molecular oxygen, but the
mechanism and temperature dependence of this oxidation process are not well understood.
We present results that suggest low temperature (< 600K) O2 exposure oxidizes oxygen
vacancies but also leaves oxygen-containing species on the surface that we propose are …
vacancy sites that are associated with reduced surface cations. Numerous studies have
shown that these sites can be oxidized by exposure to molecular oxygen, but the
mechanism and temperature dependence of this oxidation process are not well understood.
We present results that suggest low temperature (< 600K) O2 exposure oxidizes oxygen
vacancies but also leaves oxygen-containing species on the surface that we propose are …
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