Eur. Phys. J. Appl. Phys.
Volume 73, Number 1, January 2016
|Number of page(s)||10|
|Published online||13 January 2016|
Enhanced sensing properties of ZnO-SnO2 based composite type gas sensor
Department of Electronics and Communication Engineering, Tezpur University, 784028
2 Department of Physics, Jadavpur University, 700032 Kolkata, India
3 Department of Electronics and Telecommunication Engineering, Bengal Engineering and Science University, 711103 Kolkata, India
4 Centre of Excellence in Green Energy and Sensors Systems, Bengal Engineering and Science University, 711103 Kolkata, India
a e-mail: email@example.com
Revised: 14 November 2015
Accepted: 3 December 2015
Published online: 13 January 2016
Pure zinc oxide (ZnO) nanorods and zinc-tin oxide (ZnO-SnO2) composites based gas sensors were fabricated and tested for favorable gas sensing functionality. Systematic and comparative study on sensing properties like response magnitude, selectivity, response and recovery times, etc. of both the sensors were done for three test gases viz., hydrogen, methane and carbon mono-oxide. The obtained results clearly demonstrate enhanced sensing characteristics of the sensor made up of ZnO-SnO2 composites over that of pure ZnO nanorods based one. Fabricated sensors gave highest response and selectivity towards hydrogen at a relatively low temperature of 150 °C. The improved sensing properties of the sensor based on ZnO-SnO2 composites were attributed to the combined effect of the formation of depleted layer at the surface of individual ZnO/SnO2 microstructure as well as the formation of hetero-junction between ZnO and SnO2 grains. Sensing mechanism involved in the composite type ZnO-SnO2 based sensor has also been discussed.
© EDP Sciences, 2016
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