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Electron transfer between anatase TiO2 and an O2 molecule directly observed by atomic force microscopy

Proceedings of the National Academy of Sciences - PNAS, 2017-03, Vol.114 (13), p.E2556-E2562 [Peer Reviewed Journal]

Volumes 1–89 and 106–114, copyright as a collective work only; author(s) retains copyright to individual articles ;ISSN: 0027-8424 ;EISSN: 1091-6490 ;DOI: 10.1073/pnas.1618723114 ;PMID: 28289217

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  • Title:
    Electron transfer between anatase TiO2 and an O2 molecule directly observed by atomic force microscopy
  • Author: Setvin, Martin ; Hulva, Jan ; Parkinson, Gareth S. ; Schmid, Michael ; Diebold, Ulrike
  • Subjects: Physical Sciences ; PNAS Plus
  • Is Part Of: Proceedings of the National Academy of Sciences - PNAS, 2017-03, Vol.114 (13), p.E2556-E2562
  • Description: Activation of molecular oxygen is a key step in converting fuels into energy, but there is precious little experimental insight into how the process proceeds at the atomic scale. Here, we show that a combined atomic force microscopy/scanning tunneling microscopy (AFM/STM) experiment can both distinguish neutral O2 molecules in the triplet state from negatively charged (O2) radicals and charge and discharge the molecules at will. By measuring the chemical forces above the different species adsorbed on an anatase TiO2 surface, we show that the tip-generated (O2) radicals are identical to those created when (i) an O2 molecule accepts an electron from a near-surface dopant or (ii) when a photo-generated electron is transferred following irradiation of the anatase sample with UV light. Kelvin probe spectroscopy measurements indicate that electron transfer between the TiO2 and the adsorbed molecules is governed by competition between electron affinity of the physisorbed (triplet) O2 and band bending induced by the (O2) radicals. Temperature–programmed desorption and X-ray photoelectron spectroscopy data provide information about thermal stability of the species, and confirm the chemical identification inferred from AFM/STM.
  • Publisher: National Academy of Sciences
  • Language: English
  • Identifier: ISSN: 0027-8424
    EISSN: 1091-6490
    DOI: 10.1073/pnas.1618723114
    PMID: 28289217
  • Source: GFMER Free Medical Journals
    PubMed Central
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