Table 2.

Comparison of sensor’s parameters for the determination of pH for the devices presented in this work and from the literature.

Material	Sensitivity (mV/pH)	Deposition	Correlation Coefficient	Substrate	Ref.
PPY	48	Electrodeposition	0.997	Pt	[36]
PPPD	34	Electrodeposition	0.995	Pt	[36]
PANI	52	Electrodeposition	0.957	Pt	[36]
IrO2	69.9 ± 2.2	Electrodeposition	0.997	polyimide	[37]
WO3 NP	56.7 ± 1.3	Electrodeposition	0.995	polyimide	[38]
TiO2	59	Reactive sputtering	0.998	SiO2/p-Si	[39]
Si3N4	49.7	LPCVD	0.997	Si wafer	[40]
PANI	74.2 ± 2.2	Electrodeposition	0.992	FTO	This work
PANI	61.9 ± 2.7	Spin-coating	0.987	FTO	This work