Colloidal Counterpart of the TiO2-Supported V2O5 System: A Case Study of Oxide-on-Oxide Deposition by Wet Chemical Techniques. Synthesis, Vanadium Speciation, and Gas-Sensing Enhancement (Articolo in rivista)

Type
Label
  • Colloidal Counterpart of the TiO2-Supported V2O5 System: A Case Study of Oxide-on-Oxide Deposition by Wet Chemical Techniques. Synthesis, Vanadium Speciation, and Gas-Sensing Enhancement (Articolo in rivista) (literal)
Anno
  • 2013-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1021/jp406518w (literal)
Alternative label
  • Epifani, Mauro; Diaz, Rauel; Force, Carmen; Comini, Elisabetta; Andreu, Teresa; Zamani, Reza R.; Arbiol, Jordi; Siciliano, Pietro; Faglia, Guido; Morante, Joan R. (2013)
    Colloidal Counterpart of the TiO2-Supported V2O5 System: A Case Study of Oxide-on-Oxide Deposition by Wet Chemical Techniques. Synthesis, Vanadium Speciation, and Gas-Sensing Enhancement
    in Journal of physical chemistry. C
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Epifani, Mauro; Diaz, Rauel; Force, Carmen; Comini, Elisabetta; Andreu, Teresa; Zamani, Reza R.; Arbiol, Jordi; Siciliano, Pietro; Faglia, Guido; Morante, Joan R. (literal)
Pagina inizio
  • 20697 (literal)
Pagina fine
  • 20705 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 117 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 9 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 40 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • Consiglio Nazionale delle Ricerche (CNR); IMDEA Energy Inst; Universidad Rey Juan Carlos; University of Brescia; Consiglio Nazionale delle Ricerche (CNR); University of Barcelona; Consejo Superior de Investigaciones Cientificas (CSIC); ICREA; University of Barcelona (literal)
Titolo
  • Colloidal Counterpart of the TiO2-Supported V2O5 System: A Case Study of Oxide-on-Oxide Deposition by Wet Chemical Techniques. Synthesis, Vanadium Speciation, and Gas-Sensing Enhancement (literal)
Abstract
  • TiO2 anatase nanocrystals were surface modified by deposition of V(V) species. The starting amorphous TiO2 nanoparticles were prepared by hydrolytic processing of TiCl4-derived solutions. A V-containing solution, prepared from methanolysis of VCl4, was added to the TiO2 suspension before a solvothermal crystallization step in oleic acid. The resulting materials were characterized by X-ray diffraction, transmission electron microscopy (TEM), Fourier transform infrared, Raman, and magic angle spinning solid-state V-51 nuclear magnetic resonance spectroscopy (MAS NMR). It was shown that in the as-prepared nanocrystals V was deposited onto the surface, forming Ti-O-V bonds. After heat treatment at 400 degrees C, TEM/electron energy loss spectroscopy and MAS NMR showed that V was partially inserted in the anatase lattice, while the surface was covered with a denser V-O-V network. After heating at 500 degrees C, V2O5 phase separation occurred, further evidenced by thermal analyses. The 400 degrees C nanocrystals had a mean size of about 5 nm, proving the successful synthesis of the colloidal counterpart of the well-known TiO2-V2O5 catalytic system. Hence, and also due to the complete elimination of organic residuals, this sample was used for processing chemoresistive devices. Ethanol was used as a test gas, and the results showed the beneficial effect of the V surface modification of anatase, with a response improvement up to almost 2 orders of magnitude with respect to pure TiO2. Moreover, simple comparison of the temperature dependence of the response clearly evidenced the catalytic effect of V addition. (literal)
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