Abstract
SnO 2/Pt thick film CO gas sensors were fabricated by a screen printing method. The sensors were fired in the temperature range 500 to 1000 °C wit a mixing ratio of Pt to SnO 2 of 0.2 – 1.0 wt.%. The sensitivity, selectivity and response time for CO gas in air of the sensors with various compositions and sintering temperatures were investigated as a function of operating temperature. The sensors showed a low operating temperature (about 100 °C) and high sensitivity of CO gas. The sensors fired at 600 °C exhibited the highest sensitivity when the SnO 2/Pt ratio was 99.5/0.5 by weight. They showed good sensitivity to CO gas in comparison with those for other gases (H 2, C 4H 10 and C 3H 8) at 100 °C. They had a short respose time (about 2 s for 200 ppm of CO gas at 100 °C).
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