Abstract
Acid or base concentrations can be determined by coulometric titration. A new all-iridium oxide sensor-actuator device is presented, of which the titrant is generated by a reversible redox reaction occurring in the electroactive iridium oxide actuator electrode, and the equivalence point in the titration curve is detected by the pH-sensitive iridium oxide sensor. The advantage with respect to the formerly used noble metal actuator electrode/ISFET sensor device is twofold: on the one hand, interference of Cl− ions, which oxidize at the noble metal actuator electrode during titration, is avoided and on the other hand, the preparation of the all-iridium oxide device is easier than of the ISFET-based devices. In addition to the conventional potential sweep method of oxide growth, a new current-pulse method is proposed, of which the parameters for optimal growth depend less on the pH of the solution.
| Original language | Undefined |
|---|---|
| Pages (from-to) | 151-156 |
| Number of pages | 7 |
| Journal | Sensors and actuators. B: Chemical |
| Volume | 0 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1991 |
Keywords
- METIS-112170
- IR-72985
Cite this
Olthuis, W., van Kerkhof, J. C., van Kerkhof, J. C., Bergveld, P., Bos, M., & van der Linden, W. E. (1991). Preparation of iridium oxide and its application in sensor-actuator systems. Sensors and actuators. B: Chemical, 0(4), 151-156. https://doi.org/10.1016/0925-4005(91)80191-L