Abstract
Potentiometric oxygen sensors with Pt|YSZ|Pt structure were applied for detecting several volatile organic compounds (VOCs; acetic acid, methylethylketone, ethanol, benzene, toluene, o- and p-xylene) at sub-ppm levels in the temperature range of 400-500 °C. The electromotive force (EMF) output from the sensors linearly changed with logarithm of VOC concentration, and sufficiently large output was confirmed at sub-ppm levels. Among the examined VOCs, ethanol exhibited the highest sensitivity (-54.1 mV/decade) at 400 °C. However, the sensitivity of ethanol drastically decreased at 500 °C. Thus the sensitivity of all the VOCs examined in this study was tunable with temperature. An increase in temperature decreased the sensitivity but effectively modified the response and recovery times. Analysis of multi-dimensional plots combining the sensor outputs at the different operating temperatures (400, 450 and 500 °C) suggested the possibility to discriminate the different VOCs.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 56-61 |
| Number of pages | 6 |
| Journal | Sensors and Actuators, B: Chemical |
| Volume | 143 |
| Issue number | 1 |
| DOIs | |
| State | Published - Dec 4 2009 |
| Externally published | Yes |
Keywords
- EMF
- Oxygen sensor
- Sub-ppm
- VOC sensor
- YSZ
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Instrumentation
- Condensed Matter Physics
- Surfaces, Coatings and Films
- Metals and Alloys
- Electrical and Electronic Engineering
- Materials Chemistry