Investigation of Gasochromic Rhodium Complexes Regarding Their Reactivity towards CO

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

doi:10.3390/proceedings1040454

Cited by 4 publications

(6 citation statements)

References 10 publications

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“…This complex was presented in more details in refs. and . Integrated into the silica‐based supraparticles, the rhodium complex will show a color change from violet to yellow in presence of CO ( Figure a), which is caused by a reversible two‐step ligand exchange of the acetic acid by CO .…”

Section: Resultsmentioning

confidence: 99%

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Indicator Supraparticles for Smart Gasochromic Sensor Surfaces Reacting Ultrafast and Highly Sensitive

Wintzheimer

Oppmann

Dold

et al. 2019

Part & Part Syst Charact

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The detection of toxic gases, such as NH3 and CO, in the environment is of high interest in chemical, electronic, and automotive industry as even small amounts can display a health risk for workers. Sensors for the real‐time monitoring of these gases should be simple, robust, reversible, highly sensitive, inexpensive and show a fast response. The indicator supraparticles presented herein can fulfill all of these requirements. They consist of silica nanoparticles, which are assembled to supraparticles upon spray‐drying. Sensing molecules such as Reichardt's dye and a binuclear rhodium complex are loaded onto the microparticles to target NH3 and CO detection, respectively. The spray‐drying technique affords high flexibility in primary nanoparticle size selection and thus, easy adjustment of the porosity and specific surface area of the obtained micrometer‐sized supraparticles. This ultimately enables the fine‐tuning of the sensor sensitivity and response. For the application of the indicator supraparticles in a gas detection device, they can be immobilized on a coating. Due to their microscale size, they are large enough to poke out of thin coating layers, thus guaranteeing their gas accessibility, while being small enough to be applicable to flexible substrates.

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Section: Resultsmentioning

confidence: 99%

“…For the use as CO sensing molecules, binuclear rhodium complexes have been recently proposed . These compounds show a reversible, fast, and selective reaction toward carbon monoxide …”

Section: Introductionmentioning

confidence: 99%

Indicator Supraparticles for Smart Gasochromic Sensor Surfaces Reacting Ultrafast and Highly Sensitive

Wintzheimer

Oppmann

Dold

et al. 2019

Part & Part Syst Charact

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“…Further challenging is the response time of a sensor based on the colorimetric principle, which is influenced not only by the material itself, but also by the sensor configuration and the matrix. Sensor response times of a few seconds can be already achieved [32]. Future research should address the development of a matrix with the abovementioned characteristics, in combination with low-cost and compact optical sensors for read-out.…”

Section: Discussionmentioning

confidence: 99%

“…Table 2 gives the definition of possible ligands. An investigation of different rhodium complexes, obtained by varying the residues of the phosphines, regarding their reaction velocity towards CO exposure is published in [32]. Table 2 for the definition of the ligands.…”

Section: Iron Pincer Complexmentioning

confidence: 99%

Colorimetric Materials for Fire Gas Detection—A Review

et al. 2018

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The damage caused by outbreaks of fire continues to be enormous despite ongoing improvements in fire detection and fighting. Therefore, the detection of fires at the earliest possible stage is essential. The latest developments in fire detection devices include the addition of carbon monoxide (CO) or temperature sensors into the widespread smoke detectors, but also alternative solutions are searched for. Advantageous is the direct detection of the most relevant fire gases CO and nitrogen dioxide (NO 2), because they are produced very early in a developing fire. A sensitive, selective, and low-cost method to detect these gases is the use of colorimetric materials combined with a compact optical readout. In this review, we take account of recent developments in this research field and provide a comprehensive overview on suitable materials for CO and NO 2 detection in fire gas sensing and first steps towards novel fire gas detectors.

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“…The colorimetric material used for CO detection is based on a binuclear rhodium complex as described in [5]. Colorimetric dyes have been applied on glass slides with a size of 28 × 8 × 1 mm with a film thickness of typically 3 µm.…”

Section: Methodsmentioning

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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Investigation of Gasochromic Rhodium Complexes Regarding Their Reactivity towards CO

Cited by 4 publications

References 10 publications

Indicator Supraparticles for Smart Gasochromic Sensor Surfaces Reacting Ultrafast and Highly Sensitive

Indicator Supraparticles for Smart Gasochromic Sensor Surfaces Reacting Ultrafast and Highly Sensitive

Colorimetric Materials for Fire Gas Detection—A Review

Evaluation of a Colorimetric Sensor System for Early Fire Detection

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