18 October 2004 Polypyrrole as a chemo-chromic transducer for optical fiber chemical sensors
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Chemical sensors play a very important role when it comes to information gathering about the environment we live in. Conducting polymers have been used as transducer elements in many sensor devices as they offer great design flexibility, ease of processing and excellent environmental stability. Conducting polymer polypyrrole has found applications in the area of chemical sensing, primarily because of the conductivity modulation that comes about in it due to interaction with gases. In this paper, conducting polymer thin films are applied to optical fibers as a chemo-chromic transducer to sense toxic gases like ammonia, dimethylmethylphosphonate (a chemical precursor to nerve gas sarin) and organic vapors like acetone. The developed sensor device is based on the modified cladding or coating approach. In the sensor design, a small section of the optical fiber cladding is replaced by the conducting polymer polypyrrole. The optical property changes that come about in polypyrrole due to the presence of the gas leads to a change in the transmission properties of the fiber and hence gas sensing via intensity modulation.
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Lalitkumar Bansal, Lalitkumar Bansal, Mahmoud El-Sherif, Mahmoud El-Sherif, } "Polypyrrole as a chemo-chromic transducer for optical fiber chemical sensors", Proc. SPIE 5554, Photonics for Space Environments IX, (18 October 2004); doi: 10.1117/12.557530; https://doi.org/10.1117/12.557530

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