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Proceedings Paper

Metallo-porphyrins as gas sensing material for colorimetric gas sensors on planar optical waveguides
Author(s): Carolin Peter; Katrin Schmitt; Martin Schiel; Jürgen Wöllenstein
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Paper Abstract

The work presented here focuses on the investigations of metallo-porphyrins and their gasochromic behavior. Gasochromic materials change their color while they are exposed to a certain gas. So they offer the possibility to develop very selective chemical gas sensors. In the focus of this work is the metallo-porphyrin 5, 10, 15, 20- tetraphenylporphyrin-zinc (ZnTPP). When embedded into a polymeric matrix (PVC) the color change to the toxic gas NO2 can be detected. During exposure to NO2 the dye changes its color from bright purple to yellow. To develop a standalone gas sensor, the ZnTPP/PVC matrix is deposited onto a planar optical waveguide. The color change of the porphyrin dye, due to the gas exposure, can be detected in the evanescent field of the optical waveguide. Therefore the light of a high power LED is coupled into the waveguide. The color change of the porphyrin is detectable with photodiodes as variations of the decoupled light intensity. The sensor shows no cross-sensitivities to other gases like CO2, NH3, EtOH, CO or water vapor. NO2 is detectable with a limit of 1 ppm.

Paper Details

Date Published: 5 May 2011
PDF: 7 pages
Proc. SPIE 8066, Smart Sensors, Actuators, and MEMS V, 80660L (5 May 2011); doi: 10.1117/12.887390
Show Author Affiliations
Carolin Peter, Fraunhofer Institute for Physical Measurement Techniques (Germany)
Katrin Schmitt, Fraunhofer Institute for Physical Measurement Techniques (Germany)
Martin Schiel, Fraunhofer Institute for Physical Measurement Techniques (Germany)
Jürgen Wöllenstein, Fraunhofer Institute for Physical Measurement Techniques (Germany)
Univ. of Freiburg (Germany)


Published in SPIE Proceedings Vol. 8066:
Smart Sensors, Actuators, and MEMS V
Ulrich Schmid; José Luis Sánchez-Rojas; Monika Leester-Schaedel, Editor(s)

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