Colorimetric Materials for Fire Gas Detection—A Review

Schmitt, Katrin; Tarantik, Karina R.; Pannek, Carolin; Wöllenstein, Jürgen

doi:10.3390/chemosensors6020014

Cited by 19 publications

(15 citation statements)

References 46 publications

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“…Most studied OTFTs are selective to NO 2 . The detection limits are higher than that achieved with colorimetric sensors, but comparable to quartz-enhanced PAS (QEPAS) and H-type longitudinal resonant photoacoustic cells [147,176,177]. It is, however, less performant than Faraday rotation spectroscopy (FRS), a costly and sophisticated technique which uses the magnetic circular birefringence (MCB) effect [177].…”

Section: Nomentioning

confidence: 97%

“…It is worth noticing that there are several methods available for gas detection exhibiting selectivity and sensitivity, including gas chromatography (GC), mass spectrometry (MS) and optical chemical sensing [144][145][146][147][148][149][150][151][152]. Nonetheless, they are based on robust and costly equipment, which are hardly implemented at remote locations, and therefore, do not allow for on-site monitoring.…”

Section: Gas Sensing Applicationsmentioning

confidence: 99%

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Organic Thin-Film Transistors as Gas Sensors: A Review

et al. 2020

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Organic thin-film transistors (OTFTs) are miniaturized devices based upon the electronic responses of organic semiconductors. In comparison to their conventional inorganic counterparts, organic semiconductors are cheaper, can undergo reversible doping processes and may have electronic properties chiefly modulated by molecular engineering approaches. More recently, OTFTs have been designed as gas sensor devices, displaying remarkable performance for the detection of important target analytes, such as ammonia, nitrogen dioxide, hydrogen sulfide and volatile organic compounds (VOCs). The present manuscript provides a comprehensive review on the working principle of OTFTs for gas sensing, with concise descriptions of devices’ architectures and parameter extraction based upon a constant charge carrier mobility model. Then, it moves on with methods of device fabrication and physicochemical descriptions of the main organic semiconductors recently applied to gas sensors (i.e., since 2015 but emphasizing even more recent results). Finally, it describes the achievements of OTFTs in the detection of important gas pollutants alongside an outlook toward the future of this exciting technology.

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Section: Nomentioning

confidence: 97%

Section: Gas Sensing Applicationsmentioning

confidence: 99%

Organic Thin-Film Transistors as Gas Sensors: A Review

et al. 2020

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“…Gas sensitive color dyes have been chemically known about for many years. An overview of gasochromic color dyes for CO detection is given in [ 9 ]. The binuclear rhodium complex used for this work was firstly described by Esteban in 2010 [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Gasochromic Rhodium Complexes Towards Their Reactivity to CO and Integration into an Optical Gas Sensor for Fire Gas Detection

Pannek

Tarantik

Schmitt

et al. 2018

Sensors

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The detection of the toxic gas carbon monoxide (CO) in the low ppm range is required in different applications. We present a study of the reactivity of different gasochromic rhodium complexes towards the toxic gas carbon monoxide (CO). Therefore, variations of binuclear rhodium complexes with different ligands were prepared. They were characterized by FTIR spectroscopy, 1H NMR spectroscopy, and differential scanning calorimetry. All complexes are spectroscopically distinguishable and temperature stable up to at least 187 °C. The gasochromic behavior of all different compounds was tested. Therefore, the compounds were dissolved in toluene and exposed to 100 ppm CO for 10 min to investigate their gas sensitivity and reaction velocity. The changes in the transmission spectra were recorded by UV/vis spectroscopy. Furthermore, a significant influence of the solvent to the color dyes’ gasochromic reaction and behavior was observed. After characterization, one complex was transferred as sensing element into an optical gas sensor. Two different measurement principles (reflection- and waveguide-based) were built up and tested towards their capability as gasochromic CO sensors. Finally, different gas-dependent measurements were carried out.

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“…Colorimetric reactions have already been identified as a promising technology for the detection of fire related gases [3]. Various rhodium-based metal-organic complex compounds exhibit a fast, selective and reversible reaction towards CO [4].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a Colorimetric Sensor System for Early Fire Detection

et al. 2018

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The use of colorimetric reactions as a sensitive, selective and low-cost method for the detection of fire related gases is evaluated in this work. As the most relevant fire gas carbon monoxide CO is addressed in the first place. A rhodium-based metal-organic complex has been selected, which a colorimetric material sensitive for CO. For the optical readout a compact setup has been developed which provides the option for spectroscopy in transmission and attenuated total reflection in parallel. The detection of CO in concentrations relevant for fire detection has been demonstrated in synthetic gas mixtures as well as in real fire gas.

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Colorimetric Materials for Fire Gas Detection—A Review

Cited by 19 publications

References 46 publications

Organic Thin-Film Transistors as Gas Sensors: A Review

Organic Thin-Film Transistors as Gas Sensors: A Review

Investigation of Gasochromic Rhodium Complexes Towards Their Reactivity to CO and Integration into an Optical Gas Sensor for Fire Gas Detection

Evaluation of a Colorimetric Sensor System for Early Fire Detection

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