The Chloroalkoxide Route to Transition Metal Oxides. Synthesis of V2O5 Thin Films and Powders from a Vanadium Chloromethoxide (Articolo in rivista)

Type
Label
  • The Chloroalkoxide Route to Transition Metal Oxides. Synthesis of V2O5 Thin Films and Powders from a Vanadium Chloromethoxide (Articolo in rivista) (literal)
Anno
  • 2009-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/cm803242m (literal)
Alternative label
  • Epifani M, Andreu T, Magana CR, Arbiol J, Siciliano P, D'Arienzo M, Scotti R, Morazzoni F, Morante JR (2009)
    The Chloroalkoxide Route to Transition Metal Oxides. Synthesis of V2O5 Thin Films and Powders from a Vanadium Chloromethoxide
    in Chemistry of materials
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Epifani M, Andreu T, Magana CR, Arbiol J, Siciliano P, D'Arienzo M, Scotti R, Morazzoni F, Morante JR (literal)
Pagina inizio
  • 1618 (literal)
Pagina fine
  • 1626 (literal)
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  • 21 (literal)
Rivista
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  • 8 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. CNR IMM, I-73100 Lecce, Italy 2. Univ Barcelona, Dept Elect, M2E IN2UB, E-08028 Barcelona, Cat Spain 3. Univ Barcelona, Dept Elect, MIND IN2UB, E-08028 Barcelona, Cat Spain 4. Univ Barcelona, Serv Cientificotecn, TEM MAT, E-08028 Barcelona, Cat Spain 5. Univ Milano Bicocca, Dipartimento Sci Mat, I-20125 Milan, Italy 6. IREC, Barcelona 08019, Spain (literal)
Titolo
  • The Chloroalkoxide Route to Transition Metal Oxides. Synthesis of V2O5 Thin Films and Powders from a Vanadium Chloromethoxide (literal)
Abstract
  • Vanadium chloromethoxide was prepared by the methanolysis Of VCl4. The addition of water with a H2O:vanadium molar ratio ranging between 0 and 16 changed the solution color from green to deep blue at a rate increasing with water concentration. UV-vis, Fourier transform infrared, Raman, and electron paramagnetic resonance spectroscopy investigations showed that VCl4 precursor is initially methanolyzed to (VO)Cl-x(OCH3)(y) (x + y = 4) monomers. Upon water addition, methoxo ligands undergo hydrolysis. The presence of chlorine ligands and of the vanadyl group explains the long-term stability of the solutions. V2O5 thin films and powders were prepared, respectively, by spin-coating onto silicon substrates and drying of the solutions, followed by heat-treatments at temperatures up to 500 degrees C. Films and powder precursors were characterized by X-ray diffraction, FTIR, Raman, UV-vis, and EPR spectroscopy, transmission electron microscopy, and thermal analyses. The structural evolution begins by condensation of the initial monomers to form amorphous structures with poor extension of the three-dimensional network. Heat-treatment at higher temperatures induces further condensation and the elimination of the chlorine ligands, which leave an oxygen-defective structure and cause the initial formation of substoichiometric V3O7 phase. When the samples were annealed at T >= 400 degrees C, only the V2O5 phase was found. V2O5 powders annealed at 500 degrees C were used in chemoresistive gas sensing devices and were able to detect reducing gases such as ammonia and ethanol over a broad range of concentrations by stable and reliable signal. (literal)
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