Direct role of surface oxygen vacancies in visible light emission of tin dioxide nanowires (Articolo in rivista)

Type
Label
  • Direct role of surface oxygen vacancies in visible light emission of tin dioxide nanowires (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1063/1.3041775? (literal)
Alternative label
  • S. Lettieri; M. Causà; A. Setaro; F. Trani; V. Barone; D. Ninno; P. Maddalena (2008)
    Direct role of surface oxygen vacancies in visible light emission of tin dioxide nanowires
    in The Journal of chemical physics
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • S. Lettieri; M. Causà; A. Setaro; F. Trani; V. Barone; D. Ninno; P. Maddalena (literal)
Pagina inizio
  • 244710 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 129 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • [S. Lettieri]: CNR-INFM Coherentia, I-80126 Naples, Italy [M. Causa]: Univ Naples Federico 2, Dipartimento Chim, I-80126 Naples, Italy [A. Setaro, F. Trani, P. Maddalena]: Univ Naples Federico 2, Dipartimento Sci Fis, I-80126 Naples, Italy [V. Barone]: Univ Naples Federico 2, Dipartimento Chim, I-80126 Naples, Italy and Area Ric, CNR, Ist Proc Chim Fis, I-56124 Pisa, Italy (literal)
Titolo
  • Direct role of surface oxygen vacancies in visible light emission of tin dioxide nanowires (literal)
Abstract
  • Tin dioxide ?SnO2? nanowires exhibit a strong visible photoluminescence that is not observed in bulk crystalline SnO2. To explain such effect, oxygen vacancies are often invoked without clarifying if they represent the direct origin of luminescence or if their presence triggers other radiative processes. Here we report an investigation of the nature of the visible light emission in SnO2 nanowires, showing that both experimental and theoretical ab initio analyses support the first hypothesis. On the basis of photoluminescence quenching analysis and of first-principles calculations we show that surface bridging oxygen vacancies in SnO2 lead to formation of occupied and empty surface bands whose transition energies are in strong agreement with luminescence features and whose luminescence activity can be switched off by surface adsorption of oxidizing molecules. Finally, we discuss how such findings may explain the decoupling between \"electrical-active\" and \"optical-active\" states in SnO2 gas nanosensors. (literal)
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