Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 130, Issue 2, Pages 625-629Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2007.10.018
Keywords
gas sensor; selective sensor; ethanol; ceria; tin oxide; humidity
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In our earlier study, we reported that at 300 degrees C, a 2.0 wt.% CeO2-doped SnO2 sensor is highly selective to ethanol in the presence of CO and CH4 gases [F. Pourfayaz, A. Khodadadi, Y. Mortazavi, S.S. Mohajerzadeh, CeO2 doped SnO2 sensor selective to ethanol in presence of CO, LPG and CH4, Sens. Actuators B 108 (2005) 172-176]. In the present investigation, we report the influence of ambient air humidity on the ethanol selective SnO2 sensor doped with 2.0 wt.% CeO2. Maximum response to ethanol occurs at 300 degrees C which decreases with the relative humidity. The relative humidity was changed from 0 to 80% for different ambient air temperatures of 30, 40 and 50 degrees C and the response of the sensor was monitored in a 250-450 degrees C temperature range. As the relative humidity in 50 degrees C air increased from 0 to 30%, a 15% reduction in the maximum response to ethanol was observed. A further increase in the relative humidity no longer reduced the response significantly. The presence of humidity improved the sensor response to both CO and CH4 up to 350 degrees C after which the extent of improvement became smaller and at 450 degrees C was almost diminished. The sensor is shown to be quite selective to ethanol in the presence of humid air containing CO and CH4. The selectivity passes a maximum at 300 degrees C; however it declines at higher operating temperatures. (c) 2007 Elsevier B.V. All rights reserved.
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