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

Maria Cristina Carotta; Giuliano Martinelli; Yoshihiko Sadaoka; Patrizia Nunziante; Enrico Traversa

doi:10.1016/S0925-4005(98)00011-2

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 journal › Article › peer-review

42 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 language	English (US)
Pages (from-to)	270-276
Number of pages	7
Journal	Sensors and Actuators, B: Chemical
Volume	48
Issue number	1-3
DOIs	https://doi.org/10.1016/S0925-4005(98)00011-2
State	Published - May 30 1998
Externally published	Yes

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

Access to Document

10.1016/S0925-4005(98)00011-2

Cite this

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title = "Gas-sensitive electrical properties of perovskite-type SmFeO3 thick films",

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.",

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T1 - Gas-sensitive electrical properties of perovskite-type SmFeO3 thick films

AU - Carotta, Maria Cristina

AU - Martinelli, Giuliano

AU - Sadaoka, Yoshihiko

AU - Nunziante, Patrizia

AU - Traversa, Enrico

PY - 1998/5/30

Y1 - 1998/5/30

N2 - 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.

AB - 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.

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