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Effect of Dispersal of Pd Nanocatalysts on H2 Sensing Response of SnO2 Thin Film Based Gas Sensor

Published online by Cambridge University Press:  21 February 2013

Manish Kumar Verma ,
Neha Batra ,
Monika Tomar  and
Vinay Gupta
Manish Kumar Verma
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, INDIA.
Neha Batra
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, INDIA.
Monika Tomar
Affiliation:
Physics Department, Miranda House, University of Delhi, Delhi, 110007, INDIA.
Vinay Gupta
Affiliation:
Department of Physics and Astrophysics, University of Delhi, Delhi, 110007, INDIA.
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Abstract

SnO2 based sensor structures prepared by rf magnetron sputtering technique have been studied for detecting H2 gas. Pd catalyst was integrated onto the SnO2 thin film in the form of clusters and nano-particles to obtain enhanced sensing response characteristics. The prepared sensor structures have been studied over a temperature range of 50-250°C for sensing response towards 500 ppm H2 gas. The sensor with Pd catalyst dispersed in the form of nanoparticles was found to exhibit an enhanced sensing response of 1.9×103 at a relatively low operating temperature of 150°C with a fast response time of 2 s and recovery time of 65 s towards 500 ppm H2 gas. The origin of enhanced sensing response is identified in the light of the enhanced spill over of H2 gas molecules on the uncovered surface of SnO2 thin film.

Keywords

sensorsemiconductingthin film
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1494: Symposium Z – Oxide Semiconductors and Thin Films , 2013 , pp. 327 - 332
Copyright
Copyright © Materials Research Society 2013 

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References

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