Investigation of Gasochromic Rhodium Complexes Regarding Their Reactivity towards CO

Karina Tarantik,Katrin Schmitt,Jürgen Wöllenstein,Lutz Miensopust,Carolin Pannek

doi:10.3390/proceedings1040454

Karina Tarantik, Katrin Schmitt + Show 3 more

Open Access

https://doi.org/10.3390/proceedings1040454

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Abstract

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, the binuclear rhodium complexes with different ligands were prepared and their influence regarding reaction velocity and sensitivity towards CO was investigated. The most promising rhodium complex was embedded into a polymer with which glass substrates were coated. The reactivity towards CO of these layers was also investigated.

Highlights

The detection of the toxic gas carbon monoxide (CO) is especially of high relevance in early fire gas detection, but is constantly monitored in any industrial or private types of furnaces [1,2].The required concentration range is in the low ppm range
Regarding the aim of sensors to become as small as possible, energy-efficient, and low-cost, the approach of detecting gases via gasochromic dyes came to the fore during the last few years
These results show the opportunity of using rhodium complexes prepared as gas-sensitive layers on glass substrates for the selective and reversible detection of CO in air

Summary

Introduction

The detection of the toxic gas carbon monoxide (CO) is especially of high relevance in early fire gas detection, but is constantly monitored in any industrial or private types of furnaces [1,2]. Fist gasochromic determination of CO using iodine pentoxide (I2O5) was described in 1929 [3] Another suitable inorganic compound is based on a silico-molybdate complex with palladium chloride as catalyst [4]. For evaluation of the reaction velocity towards CO, the color change while applying CO was recorded of both the dissolved rhodium complexes as well as the compounds embedded into a polymer. These results show the opportunity of using rhodium complexes prepared as gas-sensitive layers on glass substrates for the selective and reversible detection of CO in air.

Synthesis of Binuclear Rhodium Complexes

Fabrication of the Gas-Sensitive Layers

Gas Sensing Experiments

Results and Discussion

Conclusions