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Open AccessArticle

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

1
Fraunhofer-Institute for Physical Measurement Techniques IPM, Heidenhofstrasse 8, 79110 Freiburg, Germany
2
Laboratory for Gas Sensors, Department of Microsystems Engineering—IMTEK, University of Freiburg, Georges-Köhler-Allee 102, 79110 Freiburg, Germany
*
Author to whom correspondence should be addressed.
Sensors 2018, 18(7), 1994; https://doi.org/10.3390/s18071994
Received: 15 May 2018 / Revised: 11 June 2018 / Accepted: 19 June 2018 / Published: 21 June 2018
(This article belongs to the Special Issue Colorimetric Nanosensors)
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. View Full-Text
Keywords: gasochromic color dye; rhodium complexes; carbon monoxide; gas sensor gasochromic color dye; rhodium complexes; carbon monoxide; gas sensor
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MDPI and ACS Style

Pannek, C.; Tarantik, K.R.; Schmitt, K.; Wöllenstein, J. Investigation of Gasochromic Rhodium Complexes Towards Their Reactivity to CO and Integration into an Optical Gas Sensor for Fire Gas Detection. Sensors 2018, 18, 1994.

AMA Style

Pannek C, Tarantik KR, Schmitt K, Wöllenstein J. Investigation of Gasochromic Rhodium Complexes Towards Their Reactivity to CO and Integration into an Optical Gas Sensor for Fire Gas Detection. Sensors. 2018; 18(7):1994.

Chicago/Turabian Style

Pannek, Carolin; Tarantik, Karina R.; Schmitt, Katrin; Wöllenstein, Jürgen. 2018. "Investigation of Gasochromic Rhodium Complexes Towards Their Reactivity to CO and Integration into an Optical Gas Sensor for Fire Gas Detection" Sensors 18, no. 7: 1994.

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