This paper aims to present the methods of improving selectivity and sensitivity of resistance gas sensors.
This paper compares various methods of improving gas sensing by temperature modulation, UV irradiation or fluctuation-enhanced sensing. The authors analyze low-frequency resistance fluctuations in commercial Taguchi gas sensors and the recently developed tungsten trioxide (WO3) gas-sensing layers, exhibiting a photo-catalytic effect.
The efficiency of using low-frequency fluctuations to improve gas detection selectivity and sensitivity was confirmed by numerous experimental studies in commercial and prototype gas sensors.
A more advanced measurement setup is required to record noise data but it will reduce the number of gas sensors necessary for identifying the investigated gas mixtures.
Fluctuation-enhanced sensing can reduce the energy consumption of gas detection systems and assures better detection results.
A thorough comparison of various gas sensing methods in resistance gas sensors is presented and supported by exemplary practical applications.
This research was partially financed by the National Science Center, Poland, number of the decision: DEC-2012/06/M/ST7/00444 “Detection of gases by means of nanotechnological resistance sensors”. CGG’s work was supported by the European Research Council under the European Community’s Seventh Framework Program (FP7/2007–2013)/ERC grant agreement no. 267234 (“GRINDOOR”), by the Spanish Government under grant no. TEC2012-32420 and the Catalan Government under grant no. 2014 SGR 1,267. R.I. acknowledges a “Ramón y Cajal” fellowship from the Ministry of Economy and Competiveness (MINECO), Spain. E.L. is supported by the Catalan Institution for Research and Advanced Studies via the ICREA Academia Award. The paper is an updated and enriched version of the presentation given at the 8th International Conference on Sensing Technology, Liverpool, UK.
Smulko, J.M., Trawka, M., Granqvist, C.G., Ionescu, R., Annanouch, F., Llobet, E. and Kish, L.B. (2015), "New approaches for improving selectivity and sensitivity of resistive gas sensors: a review", Sensor Review, Vol. 35 No. 4, pp. 340-347. https://doi.org/10.1108/SR-12-2014-0747
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