Catalysis Database

Effect of surface modification due to superacid species in controlling the sensitivity and selectivity of SnO2 gas sensors

K, Vijayamohanan and A, Keshavaraja and B S, Jayashri and A.V., Ramaswamy (1995) Effect of surface modification due to superacid species in controlling the sensitivity and selectivity of SnO2 gas sensors. Sensors and Actuators B: Chemical , 23 (1). pp. 75-81.

[img]PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
720Kb

Abstract

The sensitivity and selectivity of SnO2 gas sensors are found to be affected by the presence of sulphate species on the surface due to the formation of superacidic sites. The potential advantages of this new method of selectivity control of SnO2 gas sensors are described with respect to the sensing of carbon monoxide, ammonia, ethanol, acetone and LPG. Although an increase in sensitivity is observed in the range 3-60 ppm for a few of these gases, these modified materials show a slow loss of activity upon exposure to humidity. The evidence obtained from instrumental techniques such as XRD, TG-DTA, SEM, IR and TDS indicate that these superacid species exert considerable influence on the sensitivity by modulating the adsorption characteristics along with microstructural changes

Item Type:Article
Subjects:Science > Chemistry
ID Code:575
Deposited By:Dr S Navaladian
Deposited On:06 Apr 2007 22:55
Last Modified:06 Apr 2007 22:55

Repository Staff Only: item control page