Table 1.

Comparison of the IPA gas sensors from the literature.

Material	Detection Range (ppm ppb)	Operating Temp. (°C)	Response/Recovery Time (s)	Ref.
SnO2 nanorings	1 to 500 ppm	250	6.8/38.6	[35]
SnO2 hollow cubes	1 to 1000 ppm	180	1/-	[36]
NiO decorated CeO2	1 to 100 ppm	Room temperature	15/19	[34]
Carbon Nanotubes	10 to 1000 ppm	Room temperature	110/152	[37]
BiVO4	1 to 100 ppm	400–500	18/14	[38]
BiFeO3	2 to 100 ppm	240	6/17	[39]
S-ADH/NADH	0.5 to 1940 ppb3	Room temperature	180/230	This work