Table 5.

Summary of the sensing performance of humidity sensors based on graphene/polymer composites.

Material	Preparation Method	Type	Operating Temperature	Sensitivity/Response	Selectivity	Humidity Range	Response/Recovery Time	Stability	Ref.
m-r(CNC/GO)	Layer-by-layer spraying	Resistive	25 °C	~55	—	20–100%	~10 s/~5 s	—	[166]
CNC/GO	Pour drying	Capacitive	25–45 °C	547	—	25–90%	—	—	[167]
PVA/NFC/rGO	Pour drying	Resistive	R.T.	0.347/%RH	—	30–98%	<2 min	—	[168]
rGO/cellulose	Pour casting	Resistive	23 °C	~40%	—	35–90%	—	—	[169]
rGO/LS	Vacuum filtration	Resistive	25 °C	298%	—	22–97%	100 s/100 s	30 days	[170]
PDA/rGO	Drop casting	Resistive	25 °C	20,000	—	0–97%	20 ms/17 ms	60 days	[176]
PDA/PVA/rGO	Pour drying	Resistive	30 °C	—	—	40–100%	—	—	[175]
PDDA/rGO PSSNa/rGO	Dip coating	Impedance	22–25 °C	1000% (0.2–30%) 300% (0.2–30%)	—	0.2–90%	16 s/24 s 38 s/70 s	—	[171]
QC-P4VP/rGO	Dip-coating	Impedance	20–40 °C	500% (0.18–2.1%)	—	0.18–98%	21 s/78 s	—	[172]
PDDA/rGO	Layer-by-layer self-assembly	Resistive	25 °C	8.69–37.43%	—	11–97%	108–147 s/ 94–133 s	60 days	[173]
PDDA/GO	Layer-by-layer self-assembly	Capacitive	25 °C	1552.3 pF/% RH	—	11–97%	1 s/1 s	60 days	[174]
rGO/PVP	Spin coating	Resistive	R.T.	—	—	30–90%	3 s/3 s	—	[177]
Graphene/PVP	Ink-jet printing	Resistive	R.T.	0.3–0.21%/%RH	—	10–80%	6–16 s/ 60–300 s	28 days	[178]
rGO/PVP	Spary coating	Resistive	20–60 °C	~7	High (HCHO, H2S, NH3, acetone, H2)	7.0–97.3%	2.8s/3.5s	28 days	[179]
PVDF/graphene	Electro-spinning	Capacitive	25 °C	0.0463pF/% RH	—	40–90%	~1000 s/21.3 s	—	[180]
Graphene/PPy	Dip coating	Impedance	R.T.	138	—	12–90%	15 s/20 s	—	[181]
rGO/PU	Spin coating	Resistive	R.T.	—	—	10–70%	3.5 s/7 s	—	[182]
MGO/Nafion	Drop casting	Impedance	R.T.	—	—	11–97%	100–300 s/ 100–300 s	2 months	[183]
GO/C60	Drop casting	Capacitive	R.T.	2770%	—	11–97%	8 s/7 s	21 days	[184]
GO/MWCNT	Drop casting	Capacitive	25 °C	7980 pF/% RH	—	11–97%	5 s/2.5 s	—	[185]