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Effect of Firing Temperature on Electrical and Gas-Sensing Properties of Nano-SnO2-Based Thick-Film Resistors

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Nano-SnO2-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 SnO2 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 H2, 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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Document Type: Research Article

Affiliations: Department of Physics, Center for Advanced Studies in Material Science and Solid State Physics, University of Pune, Pune 411 007, India

Publication date: 01 October 2007

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