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Interplay between steps and oxygen vacancies on curved TiO2(110)

AuthorsMiccio, Luis A.; Abadia, Mikel; Piquero-Zulaica, Ignacio; Lobo-Checa, Jorge ; Schiller, Frederik ; Rogero, Celia ; Sánchez-Portal, Daniel ; Ortega, J. Enrique
KeywordsOxygen vacancy
Curved crystal
Vicinal surface
Titanium oxide
Issue Date2016
PublisherAmerican Chemical Society
CitationNano Letters 16(3): 2017-2022 (2016)
AbstractA vicinal rutile TiO(110) crystal with a smooth variation of atomic steps parallel to the [1-10] direction was analyzed locally with STM and ARPES. The step edge morphology changes across the samples, from [1-11] zigzag faceting to straight [1-10] steps. A step-bunching phase is attributed to an optimal (110) terrace width, where all bridge-bonded O atom vacancies (O vacs) vanish. The [1-10] steps terminate with a pair of 2-fold coordinated O atoms, which give rise to bright, triangular protrusions (S) in STM. The intensity of the Ti 3d-derived gap state correlates with the sum of O vacs plus S protrusions at steps, suggesting that both O vacs and steps contribute a similar effective charge to sample doping. The binding energy of the gap state shifts when going from the flat (110) surface toward densely stepped planes, pointing to differences in the Ti polaron near steps and at terraces.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1021/acs.nanolett.5b05286
Identifiersdoi: 10.1021/acs.nanolett.5b05286
e-issn: 1530-6992
issn: 1530-6984
Appears in Collections:(CFM) Artículos
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