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Oxygen Vacancy Origin of the Surface Band-Gap State of TiO2(110)

Yim, CM; Pang, CL; Thornton, G; (2010) Oxygen Vacancy Origin of the Surface Band-Gap State of TiO2(110). PHYS REV LETT , 104 (3) , Article 036806. 10.1103/PhysRevLett.104.036806. Green and gold open access

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Abstract

Scanning tunneling microscopy and photoemission spectroscopy have been used to determine the origin of the band-gap state in rutile TiO2(110). This state has long been attributed to oxygen vacancies (O-b vac). However, recently an alternative origin has been suggested, namely, subsurface interstitial Ti species. Here, we use electron bombardment to vary the O-b vac density while monitoring the band-gap state with photoemission spectroscopy. Our results show that O-b vac make the dominant contribution to the photoemission peak and that its magnitude is directly proportional to the O-b vac density.

Type:Article
Title:Oxygen Vacancy Origin of the Surface Band-Gap State of TiO2(110)
Open access status:An open access publication. A version is also available from UCL Discovery.
DOI:10.1103/PhysRevLett.104.036806
Publisher version:http://dx.doi.org/10.1103/PhysRevLett.104.036806
Language:English
Additional information:© 2010 The American Physical Society
Keywords:RUTILE TIO2(110), OH GROUPS, TIO2, DISSOCIATION, O-2, WATER, REACTIVITY, DEFECTS, SITES, H2O
UCL classification:UCL > School of BEAMS > Faculty of Maths and Physical Sciences > Chemistry

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