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Gas sensing properties of nano SnO2 based thick films prepared by dip coating method with effect of molarity of PtCl2 solution

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Abstract

Synthesized nanophase SnO2 powder was used as a functional material along with optimized 15 wt% of glass, fired at 550 °C for better adhesion, to fabricate thick films using screen printing on alumina substrate. Their surface was modified by dip coating in platinum chloride solution (PtCl2) of different molarities (0.05–0.2 M). A subsequent thermal treatment to these thick films was carried out at an optimized temperature of 750 °C in air atmosphere. The films were tested for 400 ppm concentration of H2, CO and LPG. Sensors dip coated with 0.15 M solution of PtCl2 show the highest sensitivity towards the test gases which is ten times higher than undoped SnO2 sensors.XRD, EDX and SEM measurements showed that the behavior could be associated with the spatial distribution of the platinum within the tin oxide film. The sensors have fast response time of 10 s to all the three gases with a minimum detection limit of 10 ppm.

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

    Anil D. Garje & Rohini C. Aiyer

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  1. Anil D. Garje
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  2. Rohini C. Aiyer
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Correspondence to Rohini C. Aiyer.

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Garje, A.D., Aiyer, R.C. Gas sensing properties of nano SnO2 based thick films prepared by dip coating method with effect of molarity of PtCl2 solution. J Mater Sci: Mater Electron 19, 547–552 (2008). https://doi.org/10.1007/s10854-007-9384-4

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  • DOI: https://doi.org/10.1007/s10854-007-9384-4

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