Comparison of PAni based humidity sensors developed with different substrates and fabrication methods.

Sensing material	Substrate	Fabrication method	Sensing principle	Detection range (%RH)	Response (%)	Linear response behaviour (R2)	Selectivity	Mechanical status	Electrode system	Max. hysteresis (%)	t res/trec (s)	Ref.
CNT/PAni	PET	In situ polymerization	Resistance	10–90	42.6	0.992	—	Flexible	Two silver electrodes	2.68	23/120	69
PAni/SLS	Paper	In situ polymerization	Resistance	5–95	99.2	0.99	Tested against different pressure conditions	Flexible	Interdigitated silver electrodes	1.5	18/35	75
PAni	Glass	LBL nano-assembly	Resistance	50–90	23	—	—	Rigid	Silver contact electrodes	—	15/27	73
Cell/PAni	Cellulose fiber	In situ polymerization	Current	2–50	13	0.999	—	Flexible	2 Extremities link to the potentiostat	—	370/1490 (long cycling)	68
PAni	Glass	Chemical Polymerization	Impedance	10–95	28	—	—	Rigid	—	3.89	—	76
PAni	Glass	Drop-casting	Impedance	36–90	—	—	—	Rigid	Two electrodes (Au and Ag)	2.0	8/27	6
Nanogranular PAni	Paper	In situ polymerization	Resistance	16–96.2	90.29	≈0.996	Against SO2, CO2, CH4, H2	Flexible	—	6.8	1300/2809	71
PAni	Paper	Ink jet printing	Impedance	16–98	200	—	—	—	PEDOT: PSS electrodes	—	10 min/—	72
PAni	Glass	Rapid mixing polymerization	Resistance	11.5–56 ppm	≈12	(CF) 0.917	—	Rigid	—	—	520/30	44
PAni/TiO2	Glass	Spin coating	Impedance	25–95	84.21	—	—	Rigid	Interdigitated silver electrodes	—	60/100	77
PAni nanofibers	—	Drop coating	Resistance	0–95	88	—	—	—	Two Screen-printed carbon electrodes	—	—	23
PAni pellet	—	In situ polymerization	Resistance	20–95	20	—	—	—	—	—	5/10	78
PAni	Paper	Drop coating	Impedance	0–97	48	0.990	Tested against ethanol(g) and CO2(g)	Flexible	Three-electrode configuration	2.1	220/150	This work