Colorimetric Gas Sensing with Enhanced Sensitivity. (2016)

• Record Type: Journal Article
• Authors: Schmitt, Katrin; Tarantik, Karina; Pannek, Carolin; Sulz, Gerd; Wöllenstein, Jürgen
• Is Part Of: Procedia engineering. Volume 168(2016)
• Page Start: 1237
• Page End: 1240
• Publication Date: 2016
• Subjects: colorimetric -- gas sensor -- high sensitivity; Engineering -- Congresses; Engineering -- Periodicals; Engineering; Conference proceedings; Periodicals; 620.005
• DOI: 10.1016/j.proeng.2016.11.430
• Languages: English
• ISSNs: 1877-7058

Abstract

Abstract: We present a colorimetric gas sensor system using folded sensing elements to obtain miniaturized, highly sensitive gas sensors. Our fabrication method offers the ease of transmission measurements and at the same time a substantial increase in sensitivity. The method is simple and cost-effective compared to waveguide-based solutions. Our colorimetric sensor was characterized using indicator dyes sensitive to ammonia (NH3 ) and carbon monoxide (CO). The sensing elements are placed between a LED and photodiodes for readout to realize a miniaturized sensor with low-cost components. First results show that by folding the sensing elements the sensitivity can be increased significantly. Ideas to optimize the number of sensing elements and sensor integration are discussed, as well as potential applications.