P1SM.9 - Sensitivity Improvement of Photo-Ionization Detectors by Coating Carbon Nanotubes on Electrodes
- 17th International Meeting on Chemical Sensors - IMCS 2018
2018-07-15 - 2018-07-19
- P-1 - Sensor Systems and Manufacturing
- S. Pyo, K. Lee, T. Noh, J. Kim - School of Mechanical Engineering, Yonsei University, Seoul (South Korea)
- 655 - 656
This paper reports the effect of carbon nanotubes (CNTs) on metal electrodes of photo-ionization detectors (PIDs) for volatile organic compounds (VOCs) for the first time. The CNTs on the electrodes widen an adsorption surface area and improve an adsorption property of electrodes for PIDs, which leading to more effective interaction with ionized VOCs and electrons. The CNTs also increase the local electric field density, enhancing the ion-capture performance. Compared to the conventional metal electrodes, the CNTs-coated electrodes resulted in over 50% enhancement of responsiveness for an identical concentration of toluene (1000 ppm), showing the possibility of highly sensitive PID-type VOC sensors.