Thick-film gas sensors based on vanadium-titanium oxide powders prepared by sol-gel synthesis

Maria Cristina Carotta*, Matteo Ferroni, Sandro Gherardi, Vincenzo Guidi, Cesare Malagù, Giuliano Martinelli, Michele Sacerdoti, Maria Luisa Di Vona, Silvia Licoccia, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

Two titania powders modified by 10 at.% of vanadium were prepared by two different sol-gel routes. The powders fired at 650 °C had the rutile structure. These powders were used to produce prototype thick-film sensors. Four series of thick-film samples were fabricated by screen-printing, fired for 1 h at 650 and 850 °C. The morphology and gas-sensing properties were examined and compared with those of pure and Ta-added titania films, previously studied by the authors. Ta addition inhibited the anatase-to-rutile phase transformation during heating and was also effective in keeping the TiO2 grain size in the nanometre range. On the contrary, V addition facilitated the anatase-to-rutile phase transformation. Thick films obtained from the two powders had similar conductance behaviour vs. temperature. The gas response of the films was affected by both the grain size and firing temperature.

Original languageEnglish (US)
Pages (from-to)1409-1413
Number of pages5
JournalJournal of the European Ceramic Society
Volume24
Issue number6
DOIs
StatePublished - Jan 1 2004

Keywords

  • Electrical properties
  • Gas sensors
  • Grain size
  • Sol-gel processes
  • TiO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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