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.

Cavaliere, E., Artiglia, L., Barcaro, G., Rizzi, G. A., Bondino, F., Fortunelli, A., Gavioli, L., Granozzi, G., Tracking thermally-activated transformations in a nanostructured metal/oxide/metal system, <<PHYSICAL CHEMISTRY CHEMICAL PHYSICS>>, 2011; 13 (38): 17171-17176. [doi:10.1039/c1cp22013f] [http://hdl.handle.net/10807/7107]

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

Cavaliere, Emanuele;Artiglia, Luca;Bondino, Federica;Gavioli, Luca;Granozzi, Gaetano
2011

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.
Inglese
Cavaliere, E., Artiglia, L., Barcaro, G., Rizzi, G. A., Bondino, F., Fortunelli, A., Gavioli, L., Granozzi, G., Tracking thermally-activated transformations in a nanostructured metal/oxide/metal system, <<PHYSICAL CHEMISTRY CHEMICAL PHYSICS>>, 2011; 13 (38): 17171-17176. [doi:10.1039/c1cp22013f] [http://hdl.handle.net/10807/7107]
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10807/7107
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 6
  • ???jsp.display-item.citation.isi??? 6
social impact