The Experts below are selected from a list of 315 Experts worldwide ranked by ideXlab platform

Igor Veremchuk - One of the best experts on this subject based on the ideXlab platform.

Laura E. Depero - One of the best experts on this subject based on the ideXlab platform.

  • structural characterization of tin and Molybdenum Oxides thin films deposited by rgto
    Chemistry of Materials, 2001
    Co-Authors: Elza Bontempi, E Zampiceni, Giorgio Sberveglieri, Laura E. Depero
    Abstract:

    In this paper the oxidation process of Sn/Mo mixed Oxides for sensing applications was explored with the aim of investigating the structural properties of these materials and eventually understanding possible relations with functional behaviors. The films were deposited by sputtering following the rules of RGTO (rheothaxial growth and thermal oxidation) and annealed in humid synthetic air at 500, 600, and 700 °C. This is the first time that those materials are deposited by the RGTO technique. The characterization was performed by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), glancing incidence X-ray diffraction (GIXRD), and micro-Raman mapping. It is shown that because of the fabrication process, as a function of the annealing temperature, an addition of a Molybdenum layer on tin films determined the formation of Oxides species different from that occurring on pure tin films. The Mo content in films treated at 600 and 700 °C decreased, probably because of the Molybdenum Oxides evaporation.

Terezia Nyari - One of the best experts on this subject based on the ideXlab platform.

  • a comparative study of the electrochemical deposition of Molybdenum Oxides thin films on copper and platinum
    Journal of Alloys and Compounds, 2009
    Co-Authors: Radu Banica, Paul Barvinschi, Nicolae Vaszilcsin, Terezia Nyari
    Abstract:

    Abstract Molybdenum Oxides thin films electrochemical deposition was performed using solutions of peroxo-polymolybdate at pH 2.3 and ammonium molybdate at pH 5.5 as precursors and smooth copper and platinum as supports. The deposition has been carried out at constant potentials in the range of −600 to −800 mV vs. Ag/AgCl (sat. KCl). The thin films deposited on copper were then heated at 350 and 450 °C in argon. In the case of thin films deposited from ammonium molybdate and heated at 450 °C, the XRD spectra reveal, along with MoO 2 , the presence of Cu 6 Mo 5 O 18 phase. For the thin films prepared from peroxo-polymolybdate and subjected to the same heat treatment, the only XRD phase present was MoO 2 . Thermogravimetric (TG) analysis was performed on samples prepared by scraping away the thin films (molybdate precursors) from the copper support. Before heat treatment, the AFM images of the as-deposited thin film reveal a granular morphology, with diameters in the 20–80 nm range.

Thorsten Ressler - One of the best experts on this subject based on the ideXlab platform.

  • Structural Investigations of Molybdenum Oxide Based Catalysts Supported on Nanostructured Magnesium Oxide
    Zeitschrift für anorganische und allgemeine Chemie, 2010
    Co-Authors: Juliane Scholz, Anke Walter, Thorsten Ressler
    Abstract:

    Molybdenum Oxides are active in the heterogeneously catalyzed selective oxidation of light alkenes and alkanes. In order to investigate binary Molybdenum Oxides other than -MoO3 under relevant reaction conditions, we have chosen supported Molybdenum Oxides. In particular nanostructured oxide materials constitute suitable support systems for model oxide catalysts. Here, we present investigations of the structure and the catalytic performance of Molybdenum oxide species supported on nanostructured MgO for the selective oxidation of propene.

  • structure stabilizing effect of tungsten in mixed Molybdenum Oxides with mo5o14 type structure
    Catalysis Today, 2007
    Co-Authors: Eva Rodel, Olaf Timpe, Annette Trunschke, Galina A Zenkovets, Galina N Kryukova, Robert Schlogl, Thorsten Ressler
    Abstract:

    Bulk structural properties of single phase crystalline (Mo0.91V0.09)5O14 and (Mo0.68V0.23W0.09)5O14 materials were investigated using in situ X-ray diffraction and in situ X-ray absorption spectroscopy at three metal edges. Temperature programmed experiments in reducing (propene) and oxidizing (oxygen) atmosphere and isothermal redox experiments at 773 K revealed differences in the bulk properties of the two phases studied. A structure stabilizing effect of tungsten in (MoVW)5O14 under oxidizing conditions was found. Moreover, tungsten centers in a (MoVW) dio- xide material exert a structure-directing effect towards re-oxidation to a Mo5O14-type structure.

Felix Kaiser - One of the best experts on this subject based on the ideXlab platform.