Screen-printed perovskite-type thick films as gas sensors for environmental monitoring

Thick films of LaFeO 3 and SmFeO 3 were fabricated by screen-printing technology on alumina substrates with comb-type Au electrodes. The perovskite-type oxide powders used for the preparation of the thick films have been prepared by the thermal decomposition at 700°C of hexacyanocomplexes, Ln[Fe(CN)...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 1999-05, Vol.55 (2), p.99-110
Main Authors: Martinelli, Giuliano, Carotta, Maria Cristina, Ferroni, Matteo, Sadaoka, Yoshihiko, Traversa, Enrico
Format: Article
Language:English
Subjects:
Environmental monitoring
Perovskite-type thick films
Screen-printed
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Summary:Thick films of LaFeO 3 and SmFeO 3 were fabricated by screen-printing technology on alumina substrates with comb-type Au electrodes. The perovskite-type oxide powders used for the preparation of the thick films have been prepared by the thermal decomposition at 700°C of hexacyanocomplexes, Ln[Fe(CN) 6] ·  nH 2O. These powders are ultrafine, homogeneous, and free of intragranular pores. The films have been fired at different temperatures in the 750–1000°C range, in N 2 and air atmospheres. The gas-sensitive electrical response of the thick films have been tested in laboratory, in environments with different gases (CO and NO 2) in dry and wet air. For field tests, the prototype sensors have been placed beside a conventional station for environmental monitoring. The electrical response of the thick films has been compared with the results of the analytical instruments for environmental monitoring. The same trend was observed for both systems, with very promising results.
ISSN:0925-4005
1873-3077
DOI:10.1016/S0925-4005(99)00054-4