P2EC.22 - Nanotechnology-Based Ozone Sensors Exploiting Low- Frequency Impedance Changes for Detection
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-2 - Electrochemical Sensors
- D. Ziegler, A. Marchisio, J. Tulliani - Department of Applied Science and Technology, Politecnico di Torino, Torino (Italy), E. Bekyarova - Carbon Solutions Inc., Riverside, CA (USA), G. Naishadham, K. Naishadham - Wi-Sense LLC, Georgia Tech Campus, Atlanta GA (USA), P. Savi - Department of Electronics and Telecommunications, Politecnico di Torino, Torino (Italy)
- 740 - 741
Scientific studies on pollutants and their health effects indicate that real-time monitoring of environmental triggers can improve public health and reduce healthcare costs. This paper introduces sensitive detectors based on functionalized single-walled carbon nanotubes (CNTs) to monitor ozone concentration at sub-ppm level. The CNTs were dispersed and sonicated into an ink formulation which was spray-coated onto interdigitated electrodes on a low-cost commercial substrate. The complex impedance of the sensor signal is measured in the laboratory at frequency between 1 kHz and 200 kHz using a benchtop Impedance Meter. Shunt conductance and capacitance extracted from these measurements on several ozone sensors reveal sensitivity of over 60% at room temperature below 50 kHz, and sensor retractability during desorption.