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Scheiber, P., Riss, A., Schmid, M., Varga, P., & Diebold, U. (2010). Observation and Destruction of an Elusive Adsorbate with STM: O₂/TiO₂ (110). Physical Review Letters, 105, 2161011–2161014. http://hdl.handle.net/20.500.12708/167305
When a slightly defective rutile TiO2ð110Þ surface is exposed to O2 at elevated temperatures, the
molecule dissociates at defects, filling O vacancies (VO) and creating O adatoms (Oad) on Ti5c rows. The
adsorption of molecular O2 at low temperatures has remained controversial. Low-temperature scanning
tunneling microscopy of O2, dosed on TiO2ð110Þ at a sample temperature of # 100 K and imaged at 17 K,
shows a molecular precursor at VO as a faint change in contrast. The adsorbed O2 easily dissociates during
the STM measurements, and the formation of Oad 's at both sides of the original VO is observed.
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Research Areas:
Materials Characterization: 50% Surfaces and Interfaces: 50%
