Microelectrodes for in-vivo determination of pH - Electrochemical Sensors, Biosensors and Their Biomedical Applications - page 281

FIGURE 10.7 A thin fi lm planar pH microelectrode array with 16 sputtered IrO x electrodes in a 4 4
arrangement. The needle type pH electrode as a control can be seen on the upper left corner of the array.
(Reproduced from [19], with permission from the Electrochemical Society, Inc.)

3.5

3.0

2.5

2.0

1.5

pH changes

1.0

0.5

0.0

FIGURE 10.8 Two-dimensional pH distribution measured by an iridium oxide-based planar micro-pH
electrode array after stimulation for only one minute. The electrode site in dark color is the Pt stimulating
electrode. All other 15 electrodes are iridium oxide pH sensing electrodes. (Reproduced from [19], with per-
mission from the Electrochemical Society, Inc.)