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Metallo-porphyrin zinc as gas sensitive material for colorimetric gas sensors on planar optical waveguides

: Peter, Carolin; Schmitt, Katrin; Apitz, Martin; Wöllenstein, Jürgen

Postprint urn:nbn:de:0011-n-2082872 (332 KByte PDF)
MD5 Fingerprint: 2d9d934c3d9a157d98f5eb8af5a78c22
The original publication is available at
Erstellt am: 24.2.2016

Microsystem Technologies 18 (2012), Nr.7-8, S.925-930
ISSN: 0946-7076
Conference "Smart Sensors, Actuators, and MEMS" <5, 2011, Prague>
Zeitschriftenaufsatz, Konferenzbeitrag, Elektronische Publikation
Fraunhofer IPM ()
gaschromatography; gas sensor; metallo-porphyrin; optical waveguide

The presented work focuses on the investigations of a metallo-porphyrin and its gasochromic behavior to different gases. Gasochromic materials change their color while they are exposed to a certain gas. So they offer the possibility to develop highly selective chemical gas sensors and gas sensing systems. The focus of this work is the characterization of the metallo-porphyrin 5, 10, 15, 20-tetraphenylporphyrin-zinc (ZnTPP). Nonetheless, there is a wide range of other possible metallo-porphyrins. When embedded into a polymeric matrix (PVC) a color change to the toxic gas NO2 can be detected. To develop a stand-alone gas sensor, the porphyrin/PVC matrix is deposited onto a planar optical waveguide. The color change of the porphyrin dye can be detected in the evanescent field of the optical w aveguide. Therefore, the light of a high power LED is coupled into the waveguide. The color change of the porphyrin is detectable with photodiodes as a variation of the out-coupled light intensity. The sensor shows no unwished sensitivities to CO2 and CO and only low to NH3. NO2 is detectable with a resolution of 1 ppm.