New approaches for improving selectivity and sensitivity of resistive gas sensors: a review
Author:
Smulko Janusz Marek,Trawka Maciej,Granqvist Claes Goran,Ionescu Radu,Annanouch Fatima,Llobet Eduard,Kish Laszlo Bela
Abstract
Purpose
– This paper aims to present the methods of improving selectivity and sensitivity of resistance gas sensors.
Design/methodology/approach
– 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.
Findings
– 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.
Research limitations/implications
– 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.
Practical implications
– Fluctuation-enhanced sensing can reduce the energy consumption of gas detection systems and assures better detection results.
Originality/value
– A thorough comparison of various gas sensing methods in resistance gas sensors is presented and supported by exemplary practical applications.
Subject
Electrical and Electronic Engineering,Industrial and Manufacturing Engineering
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