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

Cavaliere, E.; Artiglia, Luca; Barcaro, G.; Rizzi, Gian-Andrea; Bondino, F.; Fortunelli, A.; Gavioli, L.; Granozzi, Gaetano

doi:10.1039/c1cp22013f

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′-TiO1.25/Pt(111) ultrathin film in UHV. The initial reduction of the z′-TiOx 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/TiO2 nanoislands coexist on a h-TiO1.14 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 TiO1.25 phase. Further heating recovers the pristine z′-TiOx phase while Fe completely dissolves into the substrate.

Titolo:	Tracking thermally-activated transformations in a nanostructured metal/oxide/metal system
Autori:	Cavaliere E. ARTIGLIA, LUCA Barcaro G. RIZZI, GIAN-ANDREA Bondino F. Fortunelli A. Gavioli L. GRANOZZI, GAETANO mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2011
Rivista:	PHYSICAL CHEMISTRY CHEMICAL PHYSICS
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′-TiO1.25/Pt(111) ultrathin film in UHV. The initial reduction of the z′-TiOx 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/TiO2 nanoislands coexist on a h-TiO1.14 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 TiO1.25 phase. Further heating recovers the pristine z′-TiOx phase while Fe completely dissolves into the substrate.
Handle:	http://hdl.handle.net/11577/2485159
Appare nelle tipologie:	01.01 - Articolo in rivista

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