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Sensing behavior of perovskites GdCo1−xCuxO3 prepared by solution and ultrasonic-assisted aerosol methods.

Published online by Cambridge University Press:  01 February 2011

Carlos R. Michel ,
Edgar R. López  and
Arturo Chávez
Carlos R. Michel
Affiliation:
Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. M.García Barragán 1421, Guadalajara, Jalisco 44430, México.
Edgar R. López
Affiliation:
Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. M.García Barragán 1421, Guadalajara, Jalisco 44430, México.
Arturo Chávez
Affiliation:
Departamento de Física, CUCEI, Universidad de Guadalajara, Blvd. M.García Barragán 1421, Guadalajara, Jalisco 44430, México.
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Abstract

Polycrystalline samples of GdCo1−xCuxO3 (x=0, 0.15, 0.3), were prepared by two different routes: solution and ultrasonic-assisted aerosol decomposition. For both procedures, aqueous solutions containing stoichiometric amounts of Gd(NO3)36H2O, Co(NO3)26H2O and Cu(NO3)22.5H2O were used. In the solution method, the aqueous solutions were heat-dried at 76°C obtaining precursor powders, these were calcined from 80 to 950°C, in air. In the aerosol method, very small droplets were produced by an ultrasonic generator, then a flow of oxygen transported the mist through a tubular furnace, previously heated at 950°C. Solvent evaporation and chemical reaction takes place at that temperature, and the resulting powder was collected by filtration. X-ray powder diffraction was used to identify the formation of target phases. Surface microstructure of powders was analyzed by SEM, and showed that solution method produced sub-micron particles with irregular shape, whereas the aerosol method yield micron-sized hollow spherical particles. In order to determine gas sensitivity vs. temperature, electrical measurements were made in air, O2 and CO2, from room temperature to 650°C. The results showed a semiconductor behavior and a moderate gas sensitivity for samples prepared by solution method. However, unreliable data were registered for samples made by the aerosol route, caused by short connectivity between particles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 828: Symposium A – Semiconductor Materials for Sensing , 2004 , A5.1
Copyright
Copyright © Materials Research Society 2005

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References

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