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. 2019 Apr 14;19(8):1784. doi: 10.3390/s19081784

Figure 2.

Figure 2

(a) Change in surface potential with varying pH and Na+ concentration using ISFET sensor. The gate surface potential at a pH of 4.01 was offset to 0 and the change in the potential was measured from a pH of 4.01 to 9.18 and then from a Na+ concentration of 5 mM to 1 M. (b) Change in surface potential with varying pH and K+ concentration using ISFET sensor. The gate surface potential at a pH of 4.01 was offset to 0 and the change in the potential was measured from a pH of 4.01 to 9.18 and then from a K+ concentration of 5 mM to 1 M.