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. 2015 Feb 12;15(2):4212–4228. doi: 10.3390/s150204212

Figure 5.

Figure 5.

Open circuit potential of a 500 μm × 500 μm IrOx electrode before and after immersing it in 0.05-M PBS solution for 36 h. The sensitivities were 51.8 and 52.4 mV/pH, respectively, before and after the experiment.