Table 2.

Main characteristics of representative EGFET-based pH sensors.

Electrode	Range	Sensitivity (mV/pH)	Linearity (%)	Reference Electrode	FET Device	Reference
ITO/PET	2.1–12.1	45.9–52.3	98.3–99.6	Ag/AgCl	CD4007UB	[5]
InGaZnO	2–10	59.5	99.7	Ag/AgCl	CD4007	[16]
V2O5	2–10	58.1 ± 0.8	nr	nr	CD4007UB	[17]
ITO/PET	2–12	50.1 ± 1.7	98.5	Ag/AgCl	CD4007CN	[20]
SnO2	2–12	56–58	nr	SCE	CD4007UB or LF356N	[29]
PdO	2–12	62.87 ± 2	99.97	Ag/AgCl	CD4007UBE	[38]
ITO	2–12	58	nr	SCE	CD4007UB	[39]
TiO2	1.8–12	59.89	93.50	Ag/AgCl	NDP6060L	[47]
AZO	1–13	57.95	99.98	Ag/AgCl	CD4007UB	[48]
ITO/SiO2/Nb2O5	3–13	59.2	99.48	Ag/AgCl	IC4007	[49]
SnO2/ITO/PET	2–12	53.8–58.7	nr	Ag/AgCl	LT1167–I.A.	[50]
Glass	2–12	55	nr	nr	CD4007UB	[51]
CNT	3–13	50.9	99.78	nr	nr	[52]
ITO	2–12	50.2	99.9	Ag/AgCl	130nm CMOS	This work

PET, polyethylene terephthalate; AZO, aluminum-doped ZnO; CNT, carbon nanotube; I.A., instrumentation amplifier; nr, not reported.