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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/7711

Title: RESPONSE STUDY OF ELECTRON-BEAM EVAPORATED THIN-FILM TIN OXIDE GAS SENSORS
Authors: REDDY, MHM
CHANDORKAR, AN
Keywords: structural-properties
sno2
sensitivity
co
parameters
operation
Issue Date: 1992
Publisher: ELSEVIER SCIENCE SA LAUSANNE
Citation: SENSORS AND ACTUATORS B-CHEMICAL, 9(1), 1-8
Abstract: Thin-film SnO2 gas sensors are fabricated using an electron-beam evaporation method at pre-optimized substrate temperatures and post-deposition heat-treatment temperature. The response of these sensors is studied for various operating temperatures and reducing gas ambients. Reducing gases used for testing the response are hydrogen, carbon monoxide and methane, as they belong to three distinct chemical families. It is observed that the response. of these sensors follows a power-law relationship, with the exponent value always remaining less than one at higher concentrations of reducing gas. Films deposited at 25 and 350-degrees-C and heat treated at 650-degrees-C in O2 ambient for 2 h are found to be more suitable for sensor application compared to films deposited at intermediate temperatures and heat treated under identical conditions. Further, the response of the sensor is found to deteriorate with a decrease in operating temperature. It is also concluded from the results that a thin-film SnO2 sensor can be used as a selective sensor for H-2 at either low operating temperature or under very low background concentrations of other reducing gases. Finally, the above-mentioned results are explained using existing physical models.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/7711
http://hdl.handle.net/10054/7711
ISSN: 0925-4005
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