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2013-02-01 - Article/Dans un journal avec peer-review - Français - 11 page(s)

Noirfalise Xavier , Renaux Fabian, Cossement Damien, Sebaihi Noham , Lazzaroni Roberto , Snyders Rony , "Effet de la constitution cristalline de substrats de TiO2 sur la croissance de dépôt de molybdène" in Chimie Nouvelle

  • Edition : Société Royale de Chimie, Bruxelles (Belgium)
  • Codes CREF : Chimie des surfaces et des interfaces (DI1327), Physique de l'état solide (DI1261), Chimie des solides (DI1316)
  • Unités de recherche UMONS : Chimie des matériaux nouveaux (S817), Chimie des interactions plasma-surface (S882)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)

Abstract(s) :

(Anglais) Metallic molybdenum was deposited by magnetron sputtering on amorphous and (110) rutile TiO2 substrates. An interfacial reaction between the deposited Mo and the TiO2 substrates generating Ti3+, Ti2+ oxidation states is evidenced by X-ray photoelectron spectroscopy. Our XPS data suggest, as compared to the (110) rutile substrate, a higher reactivity of the amorphous TiO2 leading to a stronger Mo oxidation. In both cases, this reaction, leads to the formation of MoOx nanostructures at the interfaces. The growth mechanism of the Mo deposit as a function of the crystalline constitution of the TiO2 substrate was analyzed by processing the XPS data using the Quases ® software. The data reveal a layer-by-layer growth of the Mo deposit on the (110) rutile substrate and a Stranski-Krastanov growth on the amorphous one. We explain these different growth modes based on the TiO2 surface reactivity and electronic structure using the Cabrera-Mott theory. This explanation is supported by Time-Of-Flight Secondary Ion Mass spectrometry profiling.