Selective detection of methane and butane by temperature modulation in iron doped tin oxide sensors

In the present study we find that it is possible to develop sensors based on iron doped tin dioxide, which can detect both methane and butane (present in CNG and LPG, respectively) at a temperature of 350 °C. However, the same sensors can selectively detect butane at a temperature of 425 °C. Such di...

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Bibliographic Details
Published in:Sensors and actuators. B, Chemical Chemical, 2006-06, Vol.115 (2), p.610-613
Main Authors: Chakraborty, S., Sen, A., Maiti, H.S.
Format: Article
Language:English
Subjects:
Actuators
Butane
Butanes
Gas sensor
Iron
Methane
Modulation
Sensors
Tin dioxide
Tin oxides
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Summary:In the present study we find that it is possible to develop sensors based on iron doped tin dioxide, which can detect both methane and butane (present in CNG and LPG, respectively) at a temperature of 350 °C. However, the same sensors can selectively detect butane at a temperature of 425 °C. Such differential behaviour can be explained by considering the decrease in the number and/or strength of Lewis acid sites on SnO 2 due to Fe-doping and the role of chain length on the adsorption–desorption characteristics of alkanes. However, the incorporation of palladium as a catalyst in Fe-doped SnO 2 sensors removes the typical selectivity, and the temperatures of the maximum response coincide for methane and butane.
ISSN:0925-4005
1873-3077
DOI:10.1016/j.snb.2005.10.046