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dc.contributor.author
Santomauro, Fabio G.
dc.contributor.author
Lübcke, Andrea
dc.contributor.author
Rittmann, Jochen
dc.contributor.author
Baldini, E.
dc.contributor.author
Ferrer, A.
dc.contributor.author
Silatani, M.
dc.contributor.author
Zimmermann, P.
dc.contributor.author
Grübel, Sebastian
dc.contributor.author
Johnson, Jeremy A.
dc.contributor.author
Mariager, Simon O.
dc.contributor.author
Beaud, Paul
dc.contributor.author
Grolimund, Daniel
dc.contributor.author
Borca, Camelia
dc.contributor.author
Ingold, Gert L.
dc.contributor.author
Johnson, Steven L.
dc.contributor.author
Chergui, Majed
dc.date.accessioned
2018-10-12T16:46:51Z
dc.date.available
2017-06-11T19:47:32Z
dc.date.available
2018-10-12T16:46:51Z
dc.date.issued
2015-10-06
dc.identifier.other
10.1038/srep14834
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/105104
dc.identifier.doi
10.3929/ethz-b-000105104
dc.description.abstract
Transition metal oxides are among the most promising solar materials, whose properties rely on the generation, transport and trapping of charge carriers (electrons and holes). Identifying the latter’s dynamics at room temperature requires tools that combine elemental and structural sensitivity, with the atomic scale resolution of time (femtoseconds, fs). Here, we use fs Ti K-edge X-ray absorption spectroscopy (XAS) upon 3.49 eV (355 nm) excitation of aqueous colloidal anatase titanium dioxide nanoparticles to probe the trapping dynamics of photogenerated electrons. We find that their localization at Titanium atoms occurs in <300 fs, forming Ti3+ centres, in or near the unit cell where the electron is created. We conclude that electron localization is due to its trapping at pentacoordinated sites, mostly present in the surface shell region. The present demonstration of fs hard X-ray absorption capabilities opens the way to a detailed description of the charge carrier dynamics in transition metal oxides.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Nature Publishing Group
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Optics and photonics
en_US
dc.subject
Photocatalysis
en_US
dc.title
Femtosecond X-ray absorption study of electron localization in photoexcited anatase TiO₂
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
ethz.journal.title
Scientific Reports
ethz.journal.volume
5
en_US
ethz.pages.start
14834
en_US
ethz.size
6 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.scopus
ethz.identifier.nebis
006751867
ethz.publication.place
London
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2017-06-11T19:48:04Z
ethz.source
ECIT
ethz.identifier.importid
imp5936538b5e3ea22898
ethz.ecitpid
pub:164548
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-13T18:28:37Z
ethz.rosetta.lastUpdated
2019-01-02T14:32:29Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
ctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.atitle=Femtosecond%20X-ray%20absorption%20study%20of%20electron%20localization%20in%20photoexcited%20anatase%20TiO%E2%82%82&amp;rft.jtitle=Scientific%20Reports&amp;rft.date=2015-10-06&amp;rft.volume=5&amp;rft.spage=14834&amp;rft.au=Santomauro,%20Fabio%20G.&amp;L%C3%BCbcke,%20Andrea&amp;Rittmann,%20Jochen&amp;Baldini,%20E.&amp;Ferrer,%20A.&amp;rft.genre=article&amp;
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