Table 2.

Summary of the sensing performance of GO-based humidity sensors.

Material	Preparation Method	Type	Operating Temperature	Sensitivity/Response	Selectivity	Humidity Range	Response/Recovery Time	Long-Term Stability	Ref.
GO	Drop casting	Capacitive	25 °C	37,800%	—	15–95%	10.5 s/41 s	30 days	[76]
GO	Drop casting	Impedance	10–40 °C	—	—	10–90%	~30 ms	72 h	[74]
GO	Spary coating	Capacitive	22–90 °C	—	—	20–90%	—	500 cycles	[118]
GO	Drop casting	Conductance	25 °C	12.3 ± 2.2 μS/%RH (pH 3.3) 12.3 ± 2.2 μS/%RH (pH 9.5)	—	10–90%	2.2 s/1.6 s (pH 2.8) 91.8 s/11.3 s (pH 9.3)	—	[119]
GO foam	Dry in a frame	Impedance	25 °C	33,254%	—	11–95%	50 s/79 s	—	[120]
Ultralarge GO	Drop casting	Conductance	20 °C	4339 ± 433	—	7–100%	0.2s /0.7 s	5 days	[121]
GO	Simulation	Capacitive	25 °C	7680 pF/%RH	—	0–100%	<0.5 s	—	[123]
Li-doped GO	Drop casting	Resistive	25 °C	3038%	—	11–97%	4 s/25 s	—	[125]
GO	Spary coating	Capacitive	R.T.	—	—	12–97%	<0.1 s	—	[126]
rGO/GO/rGO	Laser direct writing	Impedance	23 °C	—	—	11–95%	1.8 s/11.5 s	30 days	[135]
rGO/GO/rGO	Laser direct writing	Voltage	R.T.	142.5	High (H2, hexane, ethanol)	6.3–100%	1.9 s/3.9 s	> 1 year	[131]