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. 2014 Jun 18;86(14):6968–6975. doi: 10.1021/ac500897t

Figure 2.

Figure 2

FET response with platinum fluid gate. (a) A real-time pH response curve of a PVC and non-PVC device with 4 subsequent HCl additions is shown. The non-PVC ISFET shows almost zero response when operated by the platinum electrode. (b) The pH response is quantified for many devices across multiple chips (n = 3). The PVC REFET sensor shows an apparent opposite trend than expected with hydrogen addition. This is due to the charge at the platinum electrode being mirrored into the REFET response. (c) A real-time pH response curve with four subsequent NaOH additions is shown. (d) The pH response is quantified across multiple devices (n = 3). The non-PVC ISFET shows minimal pH response compared to the PVC-REFET.