Bulk-defect dependent adsorption on a metal oxide surface: S/TiO2(1 1 0)

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The adsorption of molecular sulfur on TiO2(1 1 0)(1 × 1) has been studied with scanning tunneling microscopy and photoelectron spectroscopy. At room temperature S binds dissociatively to 5-fold coordinated Ti atoms and oxygen vacancies. At elevated temperatures (120-440°C) sulfur replaces surface oxygen atoms. Evidence was found that the reduction state of TiO2 crystals strongly affects the surface coverage of S at elevated temperatures. The rate of the O-S site exchange is kinetically limited by the arrival of diffusing bulk defects at the surface. © 2001 Elsevier Science B.V. All rights reserved.

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Surface Science

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