Issue 38, 2011
From the journal:

Physical Chemistry Chemical Physics

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

Emanuele Cavaliere,ab   Luca Artiglia,c   Giovanni Barcaro,d   Gian Andrea Rizzi,c   Federica Bondino,b   Alessandro Fortunelli,d   Luca Gavioliab  and  Gaetano Granozzi*c  

* Corresponding authors

a Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, Brescia, Italy

b IOM-CNR, Laboratorio TASC, Area Science Park Basovizza, S.S. 14 Km 163.5, I-34149 Trieste, Italy

c Dipartimento di Scienze Chimiche and INSTM Unit, University of Padova, Italy
E-mail: gaetano.granozzi@unipd.it
Fax: +39 0498275161
Tel: +39 0498275158

d CNR-IPCF, Istituto per i Processi Chimico-Fisici del Consiglio Nazionale delle Ricerche, Pisa, Italy

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.

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

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Article information

DOI
https://doi.org/10.1039/C1CP22013F
Article type
Paper
Submitted
20 Jun 2011
Accepted
05 Aug 2011
First published
30 Aug 2011

Phys. Chem. Chem. Phys., 2011,13, 17171-17176

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

E. Cavaliere, L. Artiglia, G. Barcaro, G. A. Rizzi, F. Bondino, A. Fortunelli, L. Gavioli and G. Granozzi, Phys. Chem. Chem. Phys., 2011, 13, 17171 DOI: 10.1039/C1CP22013F

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