A new approach to selectivity in methane sensing

A sensor selective to methane with respect to ethanol vapour has been constructed by using a multifunctional device which delivers three electrical signals proceeding from two sensors, a main one and a reference one. The main sensor provides two signals: one reflecting the conductivity change of a P...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 1993, Vol.15 (1), p.24-31
Main Authors: Dutronc, Pascale, Lucat, Claude, Ménil, Francis, Loesch, Muriel, Combes, Lionel
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Engineering Sciences
Exact sciences and technology
General, instrumentation
Micro and nanotechnologies
Microelectronics
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Summary:A sensor selective to methane with respect to ethanol vapour has been constructed by using a multifunctional device which delivers three electrical signals proceeding from two sensors, a main one and a reference one. The main sensor provides two signals: one reflecting the conductivity change of a Pd-doped tin dioxide thick film, and the other the temperature increase due to combustion processes, enhanced in the case of ethanol, but minimized for methane for which convection phenomena were shown to prevail. The latter signal is compared to a third one which measures the temperature of a reference sensor, constructed in such a manner to be insensitive to gas combustion phenomena, but to react in a similar way as the main sensor to convection phenomena, i.e. changes in ambient conditions of temperature and of gas flow.
ISSN:0925-4005
1873-3077
DOI:10.1016/0925-4005(93)85023-4