Coming from natural and anthropogenic sources, hydrogen sulfide gas H 2 S is a smelly hazardous substance at the sub-ppm level, which can lead to poisoning deaths at higher concentrations. Among the devices proposed, chemiresistive sensors based on conductive polymer appear as a good alternative to the most common solutions such as electrochemical and optical sensors.
They present various advantages in terms of design easy fabrication, easy tuning of physical and chemical properties, low cost, etc. In this review, we summarize the progresses made on conductive polymer sensors dedicated to H 2 S detection, including the performance of the different materials and sensing mechanisms. Finally, we identify the limitations of these sensors and highlight the most promising approaches to enable the use of these technologies in real-world applications. Corrosive, colorless, water-soluble, and flammable in ambient conditions, hydrogen sulfide H 2 S is a smelly hazardous substance at the sub-ppm level, which can lead to poisoning deaths at higher concentrations Malone Rubright et al.
The exposure toward this gas is mainly linked to geothermal activity e. It is also produced by the industry as a by-product of paper manufacturing and tanneries or synthetized intentionally for its use as an agricultural disinfectant and an intermediate in sulfuric acid production [ National Research Council US Committee on Acute Exposure Guideline Levels, ].
International public safety organizations have established several exposure limits from 1 ppb to ppm in order to i limit the olfactory disturbance from the natural and industrial production of H 2 S and to ii protect the workers from acute and chronic exposures Malone Rubright et al.
Humans can smell H 2 S at low concentrations 0. Moreover, H 2 S is present in various and complex environments, in which the humidity as well as the concentration in co-pollutants e.
