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EnglishWe 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: | |
| Data di pubblicazione: | 2011 |
| Rivista: | |
| 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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