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Modification of sensitivity of BaSnO3 sensor due to parameters of synthesis and formation of the device

Published online by Cambridge University Press:  02 November 2015

Yasser H. Ochoa Open the ORCID record for Yasser H. Ochoa [Opens in a new window] ,
Federico Schipani ,
Celso M. Aldao ,
Jorge E. Rodríguez-Páez  and
Miguel A. Ponce
Yasser H. Ochoa*
Affiliation:
Department of Physics, CYTEMAC Group, University of Cauca, Popayán 90002, Colombia
Federico Schipani
Affiliation:
Catalysts and Surfaces Division, INTEMA, National University of Mar del Plata, Mar del Plata 7600, Argentina
Celso M. Aldao
Affiliation:
Catalysts and Surfaces Division, INTEMA, National University of Mar del Plata, Mar del Plata 7600, Argentina
Jorge E. Rodríguez-Páez
Affiliation:
Department of Physics, CYTEMAC Group, University of Cauca, Popayán 90002, Colombia
Miguel A. Ponce
Affiliation:
Catalysts and Surfaces Division, INTEMA, National University of Mar del Plata, Mar del Plata 7600, Argentina
*
a)Address all correspondence to this author. e-mail: [email protected]
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Abstract

Powders of BaSnO3 were synthesized to obtain gas sensor thick films (using the screen printing technique) for the detection of O2 and CO. Impedance spectroscopy was used at different atmospheres and temperatures. In the presence of O2, the films showed a maximum value of sensitivity at 300 °C, with the powders formed by Pechini presenting greater reproducibility and sensitivity (with an order of magnitude greater than that for the powders formed by precipitation). Results showed that the films formed with powders obtained using the Pechini method presented a better response to CO, with a maximum sensitivity at 450 °C. In addition, in the presence of CO and for T > 250 °C, these films showed an anomalous behavior regarding their sensitivity as a function of time when platinum electrodes were used: a great increase in the electrical resistance value for exposure times greater than 10 min.

Keywords

BaSnO3controlled precipitation methodPechini methodthick filmsCO detectionsensitivity
Type
Articles
Information
Journal of Materials Research , Volume 30 , Issue 22 , 27 November 2015 , pp. 3423 - 3430
Copyright
Copyright © Materials Research Society 2015 

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