TY - JOUR
T1 - Preparation of iridium oxide and its application in sensor-actuator systems
AU - Olthuis, Wouter
AU - van Kerkhof, J.C.
AU - van Kerkhof, J.C.
AU - Bergveld, Piet
AU - Bos, M.
AU - van der Linden, W.E.
PY - 1991
Y1 - 1991
N2 - 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.
AB - 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.
KW - METIS-112170
KW - IR-72985
U2 - 10.1016/0925-4005(91)80191-L
DO - 10.1016/0925-4005(91)80191-L
M3 - Article
VL - 0
SP - 151
EP - 156
JO - Sensors and actuators. B: Chemical
JF - Sensors and actuators. B: Chemical
SN - 0925-4005
IS - 4
ER -