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Updated: Jul 14, 2026

Preparation of Hydrophobic Metal-Organic Frameworks via Plasma Enhanced Chemical Vapor Deposition of Perfluoroalkanes for the Removal of Ammonia
Published on: October 10, 2013
Dyeless optical detection of ammonia in the gaseous phase using a pH-responsive polymer--characterization of the
F Rathgeb1, D Reichl, M Herold
1Eberhard-Karls-University, Institute for Theoretical and Physical Chemistry, Tübingen, Germany.
Abstract:
pH-responsive polymers enable the dyeless optical detection of acidic or basic pollutants in air. The characterization of the sorption process and the optimization of the response time of the sensitive layers were high-lighted. The swelling of a pH-responsive polysiloxane induced by sorption of gaseous ammonia was investigated by measurement techniques such as spectroscopic ellipsometry (SE) and infrared spectroscopy (IR). Furthermore, the pH-responsive polymer was applied for the detection of gaseous ammonia using the LED-based reflectometric interference spectroscopy set-up (RIfS4lambda). A limit of detection of 0.30 mg/m3 ammonia and a response time (t90%) of 35 s could be verified. The application of pH-responsive polymers can be a powerful alternative to dye-based optical sensing, since photobleaching or leaching of the sensitive functional unit cannot occur applying this approach, and since the properties of the sensitive layer proved to be very promising.
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