Temperature dependence of an ammonia sensor in humid air based on a cryptophane-coated quartz microbalance

A cryptophane-coated sensor for ammonia based upon a quartz microbalance has been developed and the influence of the operating temperature and humidity have been evaluated. Whereas the time constant of the sensor reaction decreases at higher temperature, a lower temperature yields a higher sensor si...

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Bibliographic Details
Published inSensors and actuators. B, Chemical Vol. 57; no. 1; pp. 233 - 237
Main Authors Schramm, U, Roesky, C.E.O, Winter, S, Rechenbach, T, Boeker, P, Schulze Lammers, P, Weber, E, Bargon, J
Format Journal Article
LanguageEnglish
Published Elsevier B.V 07.09.1999
Subjects
Ammonia sensor
Cryptophane-coated quartz microbalance
Temperature dependence
Temperature dependence
Ammonia sensor
Cryptophane-coated quartz microbalance
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Summary:A cryptophane-coated sensor for ammonia based upon a quartz microbalance has been developed and the influence of the operating temperature and humidity have been evaluated. Whereas the time constant of the sensor reaction decreases at higher temperature, a lower temperature yields a higher sensor signal. To characterize the interference of relative humidity on the determination of the ammonia concentration, we have constructed a scheme of isotherms based upon measurements using pulses of a carrier gas (purge-pulse (PP) method). This scheme of isotherms enables us to explain and estimate the efficiency of the PP and of the alternate temperature-pulse (TP) method.
ISSN:0925-4005
1873-3077
DOI:10.1016/S0925-4005(99)00084-2