Abstract
Nitric oxide (NO) gas sensor using a combination of indium tin oxide (ITO) and quartz crystal microbalance is fabricated. The sensor is made from the polished AT-cut quartz crystal on which the ITO thin film is deposited using radio frequency magnetron sputtering. The sensor is sensitive to NO gas at room temperature and avoids the problems related to elevated-temperature sensors. It is shown that the sensor has a distinct negative frequency shift of 110Hz within 600s when it is exposed to 60ppm of NO. The frequency-changing rate is also found to increase with NO concentration. The chemical status of elements on the ITO surface before and after NO adsorption is investigated by X-ray photoelectron spectroscopy (XPS). Possible gas sensing mechanisms are discussed.
| Original language | English |
|---|---|
| Pages (from-to) | 175-180 |
| Number of pages | 6 |
| Journal | Sensors and Actuators B: Chemical |
| Volume | 93 |
| Issue number | 1-3 |
| DOIs | |
| State | Published - 1 Aug 2003 |
| Externally published | Yes |
| Event | Proceedings of the Ninth International Meeting on Chemical Engineering - Boston, MA, United States Duration: 7 Jul 2003 → 10 Jul 2003 |
Keywords
- Gas sensing mechanisms
- Indium tin oxide
- Quartz crystal