P4.02 - Novel sensor for long-term monitoring of ammonia in gas phase
- 13. Dresdner Sensor-Symposium 2017
2017-12-04 - 2017-12-06
Hotel Elbflorenz, Dresden
- P4. Umweltsensorik
- K. Gawlitza, C. Tiebe, U. Banach, R. Noske, M. Bartholmai, K. Rurack - Federal Institute for Materials Research and Testing (BAM), Berlin/D
- 272 - 276
Because ammonia and its reaction products can cause considerable damage to human health and ecosystems, there is a need for reliably operating and reversibly interacting sensor materials to monitor traces of gaseous ammonia in ambient air, which at best can be used on-site for in-the-field measurements. Herein, the development of a sensor material for gaseous ammonia in the lower ppm to ppb range using optical fluorescence as transduction mechanism is presented. A fluorescent dye, which shows reversible fluorescence enhancement in the presence of ammonia is incorporated into a polymer matrix, the latter to ensure the accumulation of ammonia. The sensor material is integrated into a prototype of a miniaturized sensor device, facilitating long-term operation. To calibrate the optical sensor system a gas standard generator, producing standard gas mixtures, is used, leading to a sensitivity down to lower ppm concentrations of ammonia.