H2S sensors based on chemically treated SnO2:Pd thin films

V. R. Katti; Manmeet Kaur; K. P. Muthe; A. K. Dua; S. C. Gadkari; S. K. Gupta; Vinod C. Sahni

doi:10.1117/12.514828

14 October 2003 H₂S sensors based on chemically treated SnO₂:Pd thin films

V. R. Katti, Manmeet Kaur, K. P. Muthe, A. K. Dua, S. C. Gadkari, S. K. Gupta, Vinod C. Sahni

Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003) https://doi.org/10.1117/12.514828
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India

Abstract

Preparation and characterization of gas sensors based on thin films of SnO₂:Pd to monitor trace amounts of H₂S in air are reported. Sensors have been exposed to 100% relative humidity to study the incorporation of hydroxyl group (-OH) in the film and its effects on gas sensing properties. Films have been subsequently treated with dilute sulphuric acid and characterized using different techniques such as X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, IR spectroscopy and electrical resistance measurements. IR studies reveal the presence of two types of hydroxyl groups (-OH) in the film; as 'free surface -OH' and hydrogen bonded -OH. The two types of -OH have been found to affect the gas sensing properties in different ways. Chemical treatment of films with dilute sulphuric acid has been found to improve the H₂S sensing properties of the sensor by modifying the concentrations of the two types of hydroxyl groups.

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V. R. Katti, Manmeet Kaur, K. P. Muthe, A. K. Dua, S. C. Gadkari, S. K. Gupta, and Vinod C. Sahni "H₂S sensors based on chemically treated SnO₂:Pd thin films", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003); https://doi.org/10.1117/12.514828

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