From doping to phase transformation: Ammonia sensing performances of chloroalkoxide-derived WO3 powders modified with chromium (Articolo in rivista)

Type

• Prodotto della ricerca (Classe)
• Articolo in rivista (Classe)

Label

• From doping to phase transformation: Ammonia sensing performances of chloroalkoxide-derived WO3 powders modified with chromium (Articolo in rivista) (literal)

Anno

• 2010-01-01T00:00:00+01:00 (literal)

Alternative label

• Epifani M, Andreu T, Magana CR, Diaz R, Arbiol J, Siciliano P, Morante JR (2010)
  From doping to phase transformation: Ammonia sensing performances of chloroalkoxide-derived WO3 powders modified with chromium
  in Sensors and actuators. B, Chemical (Print)
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Epifani M, Andreu T, Magana CR, Diaz R, Arbiol J, Siciliano P, Morante JR (literal)

Pagina inizio

• 200 (literal)

Pagina fine

• 206 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 148 (literal)

Rivista

• Sensors and actuators. B, Chemical (Rivista)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• 1. IMM CNR, I-73100 Lecce, Italy 2. Univ Barcelona, M2E, Dept Elect, IN2UB,XaRMAE, E-08028 Barcelona, CAT Spain 3. Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF Mexico 4. CSIC, ICREA, Barcelona 08193, CAT Spain 5. CSIC, Inst Ciencia Mat Barcelona, E-08193 Barcelona, CAT Spain 6. IREC, E-08019 Barcelona, Spain (literal)

Titolo

• From doping to phase transformation: Ammonia sensing performances of chloroalkoxide-derived WO3 powders modified with chromium (literal)

Abstract

• WO3 precursor solutions were prepared by methanolysis of WCl6 in presence of acetylacetone as a stabilizer. Chromium addition was achieved by mixing Cr 2-ethylhexanoate with the pure solutions, with Cr: W atomic concentrations ranging from 2% to 22%. Powders were prepared by drying the solutions and heat-treating the product up to 700 degrees C. After heat-treating at 400 degrees C, crystalline WO3 was obtained, and X-ray diffraction and Transmission Electron Microscopy showed that the powders were constituted by a mixture of the WO3 monoclinic and triclinic crystallographic phases. The Cr-modified samples, with a Cr concentration of at least 5%, presented the additional phase Cr2WO6. Structural investigations suggested that this phase was favored instead of chromium oxides due to the incorporation of Cr in the WO3 lattice in interstitial position. The sensing tests towards ammonia gas, in concentrations ranging from 50 to 500 ppm, showed that, up to 5% concentration, Cr addition is beneficial in lowering the best operating temperatures and/or improving the response with respect to the pure powders. For higher Cr concentrations, the response severely decays. This result was interpreted in terms of the Cr2WO6 grains and of the influence of lowered concentration of interstitial Cr on the oxygen vacancies. (literal)

Prodotto di

• Institute for microelectronics and microsystems (IMM) (Istituto)
• Sensori e Microsistemi Intelligenti per la Sicurezza e la Qualità della vita nei settori Agroalimentare, Trasporti ed \"Ambient Assisted Living\" (MD.P05.010.001) (Modulo)

Autore CNR

• PIETRO ALEARDO SICILIANO (Unità di personale interno)
• MAURO SALVATORE EPIFANI (Unità di personale interno)

Incoming links:

Prodotto

• Institute for microelectronics and microsystems (IMM) (Istituto)
• Sensori e Microsistemi Intelligenti per la Sicurezza e la Qualità della vita nei settori Agroalimentare, Trasporti ed \"Ambient Assisted Living\" (MD.P05.010.001) (Modulo)

Autore CNR di

• PIETRO ALEARDO SICILIANO (Unità di personale interno)
• MAURO SALVATORE EPIFANI (Unità di personale interno)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• Sensors and actuators. B, Chemical (Rivista)