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Title: Gas-sensing properties of sprayed films of (CdO)x(ZnO)1-x mixed oxide
Author: Ferro, R.
Rodríguez, J. A.
Jimenez, Ismael
Cirera Hernández, Albert
Cerdà Belmonte, Judith
Morante i Lleonart, Joan Ramon
Keywords: Detectors de gasos
Gas detectors
Issue Date: 2005
Publisher: IEEE
Abstract: A novel NO2 sensor based on (CdO)x(ZnO)1-x mixed-oxide thin films deposited by the spray pyrolysis technique is developed. The sensor response to 3-ppm NO2 is studied in the range 50°C-350°C for three different film compositions. The device is also tested for other harmful gases, such as CO (300 ppm) and CH4 (3000 ppm). The sensor response to these reducing gases is different at different temperatures varying from the response typical for the p-type semiconductor to that typical for the n-type semiconductor. Satisfactory response to NO2 and dynamic behavior at 230°C, as well as low resistivity, are observed for the mixed-oxide film with 30% Cd. The response to interfering gas is poor at working temperature (230°C). On the basis of this study, a possible sensing mechanism is proposed.
Note: Reproducció del document publicat a
It is part of: IEEE Sensors Journal, 2005, vol. 5, núm. 1, p. 48-52.
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ISSN: 1530-437X
Appears in Collections:Articles publicats en revistes (Enginyeria Electrònica i Biomèdica)

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