Monitoring dynamics of different processes on rutile TiO2(110) surface by following work function change

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Time evolution of the work function (WF) change of TiO2 (110) rutile surface due to the oxygen adsorption and electron bombardment has been investigated. Oxygen adsorption has been performed on surfaces prepared in different ways (annealing temperature, in UHV or in oxygen atmosphere) which have different amounts of bridging oxygen vacancies (BOVs). The surfaces having low amount of BOVs were used in electron bombardment experiments. WF increases due to the O2 adsorption, and the overall change increases with the amount of BOVs. The result is consistent with the BOV healing by O2 adsorption. Oxygen adsorption results can be correlated with the shape of the Ti 2p photoelectron line: there is a linear dependence between the total WF change and the relative amount of the Ti3+ contribution in the Ti 2p3/2 line up to 0.2 eV when WF change reaches the saturation. Electron bombardment reduces WF due to the well known process of electron stimulated desorption of oxygen from bridging oxygen sites. The total change reaches about 0.5 eV, when the saturation is reached. It was shown that the efficiency for creating BOVs by electron bombardment increases with the electron energy.

Original languageEnglish
Pages (from-to)327-329
Number of pages3
JournalVacuum
Volume152
DOIs
Publication statusPublished - 1 Jun 2018

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rutile
Oxygen vacancies
Oxygen
Electrons
Monitoring
Adsorption
oxygen
electron bombardment
adsorption
Photoelectrons
titanium dioxide
Desorption
saturation
Annealing
healing
bombardment
photoelectrons
desorption
electron energy
Experiments

Keywords

  • Adsorption
  • Surface defects
  • TiO
  • Work function

Cite this

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title = "Monitoring dynamics of different processes on rutile TiO2(110) surface by following work function change",
abstract = "Time evolution of the work function (WF) change of TiO2 (110) rutile surface due to the oxygen adsorption and electron bombardment has been investigated. Oxygen adsorption has been performed on surfaces prepared in different ways (annealing temperature, in UHV or in oxygen atmosphere) which have different amounts of bridging oxygen vacancies (BOVs). The surfaces having low amount of BOVs were used in electron bombardment experiments. WF increases due to the O2 adsorption, and the overall change increases with the amount of BOVs. The result is consistent with the BOV healing by O2 adsorption. Oxygen adsorption results can be correlated with the shape of the Ti 2p photoelectron line: there is a linear dependence between the total WF change and the relative amount of the Ti3+ contribution in the Ti 2p3/2 line up to 0.2 eV when WF change reaches the saturation. Electron bombardment reduces WF due to the well known process of electron stimulated desorption of oxygen from bridging oxygen sites. The total change reaches about 0.5 eV, when the saturation is reached. It was shown that the efficiency for creating BOVs by electron bombardment increases with the electron energy.",
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author = "J. Trigueiro and N. Bundaleski and Teodoro, {O. M. N. D.}",
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Monitoring dynamics of different processes on rutile TiO2(110) surface by following work function change. / Trigueiro, J.; Bundaleski, N.; Teodoro, O. M. N. D.

In: Vacuum, Vol. 152, 01.06.2018, p. 327-329.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Monitoring dynamics of different processes on rutile TiO2(110) surface by following work function change

AU - Trigueiro, J.

AU - Bundaleski, N.

AU - Teodoro, O. M. N. D.

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PY - 2018/6/1

Y1 - 2018/6/1

N2 - Time evolution of the work function (WF) change of TiO2 (110) rutile surface due to the oxygen adsorption and electron bombardment has been investigated. Oxygen adsorption has been performed on surfaces prepared in different ways (annealing temperature, in UHV or in oxygen atmosphere) which have different amounts of bridging oxygen vacancies (BOVs). The surfaces having low amount of BOVs were used in electron bombardment experiments. WF increases due to the O2 adsorption, and the overall change increases with the amount of BOVs. The result is consistent with the BOV healing by O2 adsorption. Oxygen adsorption results can be correlated with the shape of the Ti 2p photoelectron line: there is a linear dependence between the total WF change and the relative amount of the Ti3+ contribution in the Ti 2p3/2 line up to 0.2 eV when WF change reaches the saturation. Electron bombardment reduces WF due to the well known process of electron stimulated desorption of oxygen from bridging oxygen sites. The total change reaches about 0.5 eV, when the saturation is reached. It was shown that the efficiency for creating BOVs by electron bombardment increases with the electron energy.

AB - Time evolution of the work function (WF) change of TiO2 (110) rutile surface due to the oxygen adsorption and electron bombardment has been investigated. Oxygen adsorption has been performed on surfaces prepared in different ways (annealing temperature, in UHV or in oxygen atmosphere) which have different amounts of bridging oxygen vacancies (BOVs). The surfaces having low amount of BOVs were used in electron bombardment experiments. WF increases due to the O2 adsorption, and the overall change increases with the amount of BOVs. The result is consistent with the BOV healing by O2 adsorption. Oxygen adsorption results can be correlated with the shape of the Ti 2p photoelectron line: there is a linear dependence between the total WF change and the relative amount of the Ti3+ contribution in the Ti 2p3/2 line up to 0.2 eV when WF change reaches the saturation. Electron bombardment reduces WF due to the well known process of electron stimulated desorption of oxygen from bridging oxygen sites. The total change reaches about 0.5 eV, when the saturation is reached. It was shown that the efficiency for creating BOVs by electron bombardment increases with the electron energy.

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