采用LaCoO/sub - 3/钙钛矿滤料和Pt/SnO/sub - 2/滤料对CO和乙醇存在的CH/sub - 4/具有高选择性的传感器

The 13th International Conference on Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05. Pub Date : 2005-06-05 DOI:10.1109/SENSOR.2005.1497470

S. Ajami, Y. Mortazavi, A. Khodadadi, F. Pourfayaz, S. Mohajerzadeh

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引用次数: 5

摘要

在本研究中，LaCoO/sub 3/被用作有源滤波器，以消除传感器对一氧化碳和乙醇的敏感性。采用溶胶-凝胶法制备SnO/sub - 2/细粉，用六氯铂酸浸渍，在SnO/sub - 2/上得到1.0 wt% Pt。采用柠檬酸盐法制备LaCoO/sub - 3/钙钛矿细粉，以La和Co的硝酸盐前驱体作为活性过滤器。LaCoO/sub - 3/钙钛矿使传感器对CO和乙醇的灵敏度显著下降。钙钛矿似乎在低于250/spl℃的温度下氧化CO和乙醇，而甲烷在高达450/spl℃的温度下不受影响。这样，钙钛矿过滤器消除了传感器对CO和乙醇的敏感性，使传感器在空气中存在CO和乙醇的情况下对甲烷具有高度选择性。

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Highly selective sensor to CH/sub 4/ in presence of CO and ethanol using LaCoO/sub 3/ perovskite filter with Pt/SnO/sub 2/

In the present investigation, LaCoO/sub 3/ 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 SnO/sub 2/ fine powder, which was impregnated with hexachloroplatinic acid to obtain 1.0 wt% Pt on SnO/sub 2/. The LaCoO/sub 3/ perovskite fine powder was prepared by citrate method, using nitrate precursors of La and Co, to act as active filter. The LaCoO/sub 3/ 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/spl deg/C whereas methane is not affected at temperature as high as 450/spl deg/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.

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来源期刊

The 13th International Conference on Solid-State Sensors, Actuators and Microsystems, 2005. Digest of Technical Papers. TRANSDUCERS '05.

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