A new evanescent wave ammonia sensor based on polyaniline composite

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• 作者：A. Airoudj ; D. Debarnot ; B. Bê ; che ; F. Poncin-Epaillard
• 关键词：Ammonia detection ; Polymer sensitive layer ; Planar waveguide sensor ; Light power variations
• 刊名：Talanta
• 出版年：2008
• 期刊代码：106_00399140
• 类别：ch
• 出版时间：15 July 2008
• 卷：76
• 期：2
• 页码：314-319
• 文件大小：603 K

摘要

A single-mode TE₀–TM₀ optical planar waveguide ammonia sensor based on polyaniline/polymethyl methacrylate (PANI/PMMA) composite is designed and developed. The sensing properties of the photonic sensor to ammonia at room temperature are studied. A significant change is observed in the guided light output power of the sensor after it is exposed to ammonia gas. The metrological parameters (sensitivity, response time and recovery time) of the sensor are strongly influenced by the interaction length (length of sensing region). Compared with the conventional optical ammonia sensor based on absorption spectroscopy, the integrated optical sensor is more sensitive to ammonia.