. 2020 Mar 6;20(5):1432. doi: 10.3390/s20051432

Table 1.

Comparative table of state-of the-art SAW sensors and Ag/PPy L-SAW sensors for acetone, ethanol and toluene.

Sensitive Material	Gas	LTC (ppm)	HTC (ppm)	Sensitivity (Hz/ppm)	LOD (ppm)	Temperature	Reference
Ag/PPy	Acetone	0.5	5	910	0.003	RT	This work
	Ethanol			742	0.005
	Toluene			340	0.020
PPy	Acetone	5.5	80	116.4	-	RT	[27]
PEI/Fe₃O₄	Ethanol	160	16,000	1.6	65	ND	[28]
PEI/Fe₃O₄	Toluene	160	16,000	1.9	54	ND	[28]
MWCNTs-PEI	Ethanol	200	40,000	1.2	176.5	ND	[29]
MWCNTs-PEI	Toluene	200	40,000	1.2	170.7	ND	[29]
PEI/WO₃	Acetone	50	800	3.4	15	RT	[8]
	Ethanol			7.9	6
	Toluene			4.8	11
GO	Ethanol	30	750	30	-	ND	[9]
GO	Toluene	30	750	24	-	ND	[9]
ZIF/Au	Acetone	5	25	28	1.1	RT	[30]
ZIF/Au	Ethanol	5	25	72	0.5	RT	[30]
SnO₂/Co₃O₄	Toluene	100	900	0.6	50	RT	[7]
PEUT-MWCNTs	Toluene	25	200	12.2	0.6	RT	[10]

LTC—lowest tested concentration, HTC—highest tested concentration, RT—room temperature, MWCNTs—multi-wall carbon nanotubes, PEI—polyethylenimine, GO—graphene oxide, ZIF—zeolitic imidazolate frameworks, PEUT—polyetherurethane, ND—not defined.