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A colorimetric CO sensor for fire detection

: Courbat, J.; Pascu, M.; Gutmacher, D.; Briand, D.; Wöllenstein, J.; Hoefer, U.; Severin, K.; Rooij, N.F. de

Postprint (PDF; )

Eurosensors XXV Conference 2011 : September 4.-7., 2011, Athens, Greece
Amsterdam: Elsevier, 2011 (Procedia engineering 25.2011)
Eurosensors <25, 2011, Athens>
Conference Paper, Electronic Publication
Fraunhofer IPM ()

We report on a colorimetric carbon monoxide (CO) sensor based on a rhodium complex. The sensor relies on changes in the light absorption properties of the chemochromic reagent when exposed to the gas. Its optical properties in solution and in a polymeric matrix were investigated by spectrophotometry. A strong color change from purple to yellow was obtained when exposed to CO. For its implementation in a sensor configuration, the complex embedded in a PVC-based matrix was spin-coated onto a glass waveguide. The sensor was tested in a gas cell and with standardized test fires. It showed a high sensitivity to low concentrations of CO, a fast reaction time and complete reversibility. The device may find applications in the field of fire detection and indoor air quality monitoring.