Nano‐SnO 2 ‐based thick‐film resistors were fabricated using screen printing technology. To study the effect of firing temperature, sensors were fired in the range 425–850°C. A mixture of tetragonal and orthorhombic SnO 2 was observed in the range 425–700°C. Above 700°C, the presence of majority tetragonal phase was observed. The sheet resistivity and TCR values were one to two orders of magnitude less than the reported values. Sensors fired at 750°C showed the highest sensitivity and selectivity for H 2 , CO, and LPG at 140°C, 210°C, and 180°C, respectively, with a response and recovery time of 12 and 22 s.
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Garje et al. (2007) studied this question.
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