DocumentCode :
1802428
Title :
Highly selective sensor to CH4 in presence of CO and ethanol using LaCoO3 perovskite filter with Pt/SnO2
Author :
Ajami, S. ; Mortazavi, Y. ; Khodadadi, A. ; Pourfayaz, F. ; Mohajerzadeh, S.
Author_Institution :
Catalysis & Nano-structured Mater. Lab., Tehran Univ., Iran
Volume :
2
fYear :
2005
fDate :
5-9 June 2005
Firstpage :
1907
Abstract :
In the present investigation, LaCoO3 is used as an active filter for elimination of the sensor sensitivity to carbon monoxide and ethanol. A sol-gel procedure was used for the preparation of SnO2 fine powder, which was impregnated with hexachloroplatinic acid to obtain 1.0 wt% Pt on SnO2. The LaCoO3 perovskite fine powder was prepared by citrate method, using nitrate precursors of La and Co, to act as active filter. The LaCoO3 perovskite caused the sensitivity of the sensor to CO and ethanol declined significantly. It seems that the perovskite oxidizes CO and ethanol at temperatures lower than 250°C whereas methane is not affected at temperature as high as 450°C. This way the perovskite filter eliminates the sensor sensitivity to CO and ethanol, making the sensors highly selective to methane in presence of CO and ethanol in air.
Keywords :
active filters; carbon compounds; gas sensors; lanthanum compounds; powders; sol-gel processing; tin compounds; LaCoO3; LaCoO3 perovskite filter; SnO2; active filter; carbon monoxide; citrate method; ethanol; fine powder; hexachloroplatinic acid; highly selective sensor; methane selective sensor; nitrate precursor; sensor sensitivity; sol-gel procedure; Active filters; Actuators; Ethanol; Gas detectors; Gases; Temperature control; Temperature distribution; Temperature sensors; Testing; Three-term control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05. The 13th International Conference on
Print_ISBN :
0-7803-8994-8
Type :
conf
DOI :
10.1109/SENSOR.2005.1497470
Filename :
1497470
Link To Document :
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