Gas-sensitive electrical properties of perovskite-type SmFeO3 thick films

Maria Cristina Carotta*, Giuliano Martinelli, Yoshihiko Sadaoka, Patrizia Nunziante, Enrico Traversa

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Ultrafine SmFeO3 powders have been prepared by the thermal decomposition at 700°C of the corresponding hexacyanocomplex, Sm[Fe(CN)6]·4H2O. These powders have been used for the preparation of thick films, screen-printed on alumina substrates with comb-type Au electrodes. The electrical response of the films fired at 750°C, in N2 and air atmospheres, prepared from pastes with different composition of the organic vehicle (o.v.), showed that they were sensitive to CO and NO2 in dry and wet air. The composition of the o.v. strongly influenced the electrical conductivity and its activation energy and the gas response of the SmFeO3 films, which had similar microstructure. The presence in the o.v. of components with hydroxyl groups causes a reaction with adsorbed oxygen species, which results in an increase in the films resistivity, being SmFeO3 a p-type semiconductor and in their NO2 response. The thick film processing parameters are thus of primary concern for the NO2 sensing properties of the SmFeO3 thick films.

Original languageEnglish (US)
Pages (from-to)270-276
Number of pages7
JournalSensors and Actuators, B: Chemical
Volume48
Issue number1-3
DOIs
StatePublished - May 30 1998

Keywords

  • Gas-sensitive
  • Perovskite-type
  • Thick films

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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