Solid state gas sensor for fast carbon dioxide detection

Promising results on the behaviour of BaTiO 3–CuO sputtered thin films as a sensing material under carbon dioxide atmospheres are presented. The response to carbon dioxide of BaTiO 3–CuO is due to a reversible reaction based on the presence of BaCO 3 in the material. The measurement of impedance cha...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2008-02, Vol.129 (2), p.705-709
Main Authors: Herrán, Jaime, Mandayo, Gemma García, Castaño, Enrique
Format: Article
Language:English
Subjects:
Actuators
Barium titanates
BaTiO 3–CuO
CAPACITANCE
CARBON DIOXIDE
CO 2
COPPER OXIDE
CUPRIC OXIDE
Detection
Gas sensor
Heterojunctions
INTERFACES
Monitors
OXIDES
SOLID STATE PHYSICS
THIN FILMS
Work functions
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Description
Summary:Promising results on the behaviour of BaTiO 3–CuO sputtered thin films as a sensing material under carbon dioxide atmospheres are presented. The response to carbon dioxide of BaTiO 3–CuO is due to a reversible reaction based on the presence of BaCO 3 in the material. The measurement of impedance changes allows to monitor the variation in CO 2 concentration. Resistance and capacitance changes are closely related to work function changes in the p–n heterojunction between BaTiO 3 and CuO. The sensing layer thickness influence on the response and the influence of Ag as an additive in the film are also reported.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2007.09.028