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

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Nanosized SnO2 powder is synthesized by thermal decomposition of tin diacetate at various decomposition temperatures (275, 300, 325, 350, 380, 400, 425, and 450 °C) and its effect on electrical and gas sensing properties of TFR is reported here. Up to 400 °C, nano SnO2 powder exhibit a mixture of tetragonal and orthorhombic phase with SnXOY. Above 400 °C dominant presence of single tetragonal phase is observed. The resistivity and TCR of TFR's is 2 to 3 orders of magnitude lesser than the reported values. Thermal analysis of tin diacetate is carried out by TGA-DTA. The material characterization is done by XRD (particle size and phases) and SEM (surface morphology). The sensors fabricated with the mixed phase of SnO2 powder exhibit lower sensitivity to H2, CO, and LPG (400 ppm) than those fabricated by the single tetragonal phase SnO2 powder. The sensors shows temperature selectivity for H2, CO, and LPG at 150, 210, and 190 °C, respectively. The sensors were found to be extremely stable and repeatable with a response and recovery time of approximately 10 and 18 seconds, respectively.


Document Type: Research Article


Publication date: 2006-12-01

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