Tracking thermally-activated transformations in a nanostructured metal/oxide/metal system

Emanuele Cavaliere, Luca Gavioli, Luca Artiglia, Federica Bondino, Gaetano Granozzi, Giovanni Barcaro, Gian Andrea Rizzi, Alessandro Fortunelli

Risultato della ricerca: Contributo in rivistaArticolo in rivistapeer review

6 Citazioni (Scopus)

Abstract

We present experimental and theoretical evidence of sequential redox processes and structural transformations occurring by increasing temperature in a metal/oxide/metal system obtained via deposition of Fe atoms onto a z'-TiO(1.25)/Pt(111) ultrathin film in UHV. The initial reduction of the z'-TiO(x) phase by Fe at room temperature is followed by Fe diffusion and partial penetration into the substrate at intermediate temperatures. This triggers the formation of a bi-component material in which mixed FeO/TiO(2) nanoislands coexist on a h-TiO(1.14) ultrathin film, notably restructured (from rectangular to hexagonal) and reduced (from Ti : O = 1 : 1.25 to 1 : 1.14) with respect to the original TiO(1.25) phase. Further heating recovers the pristine z'-TiO(x) phase while Fe completely dissolves into the substrate.
Lingua originaleEnglish
pagine (da-a)17171-17176
Numero di pagine6
RivistaPhysical Chemistry Chemical Physics
Volume13
DOI
Stato di pubblicazionePubblicato - 2011

Keywords

  • Directed-assembly
  • Metal nanoparticles
  • Metal/oxide interaction
  • Oxide layers
  • Templating effect
  • morphology
  • redox process

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