STM studies of defect production on the TiO 2 (110)-(1 × 1) and TiO 2 (110)-1 × 2) surfaces induced by UV irradiation

S. Mezhenny, P. Maksymovych, T. L. Thompson, O. Diwald, D. Stahl, S. D. Walck, J. T. Yates

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Abstract

The effect of UV radiation (1.6 eV ≤ hv ≤ 65.6 eV) on the rutile surface was studied in ultrahigh vacuum (UHV) using the scanning tunneling microscope (STM). It was found that the TiO 2 (110)-(1 × 1) surface remains unaffected by UV irradiation. However, line defects along the (001) direction were formed on the TiO 2 (110)-(1 × 2) surface, the crosssection for the defect formation being 10 -23.5±0.2 cm 2 photon -1 (hv ≥ 3.0 eV). The defects are attributed to collective oxygen removal by UV light. It was also found that the defects were stable in UHV (up to 48 h), and their formation was not temperature dependent.

Original languageEnglish
Pages (from-to)152-158
Number of pages7
JournalChemical Physics Letters
Volume369
Issue number1-2
DOIs
StatePublished - Feb 7 2003
Externally publishedYes

Funding

This work was supported by the DoD Multidisciplinary University Research Initiative (MURI) program administered by the Army Research Office under Grant DAAD19-01-0-0619 and a PPG Industries Grant. O.D. gratefully acknowledges the support by the Austrian Science Fund (Project J 2058). We would like to thank Dr. Igor Lyubinetsky and Mr. Tykhon Zubkov for helpful advice. We also thank Professors A. Fujishima and K. Hashimoto (University of Tokyo) for fruitful discussions.

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