Table 1.

A summary of pristine acetone gas sensors reported in the literature.

Sensing Material	Acetone Concentration (ppm)	Sensing Temperature (°C)	Response (Ra/Rg) or (Rg/Ra)	Ref.
p-type gas sensors
NiFe2O4 NPs	100	250	27.4	[18]
ZnCo2O4 NPs	200	200	38.2	[85]
BiFeO3 NPs	10	350	12	[74]
PrFeO3 NFs	200	180	141	[75]
Co3O4 nanosheet array	1000	111	36.5	[95]
Co3O4 nanocubes	500	240	4.9	[96]
n-type gas sensors
Fe2O3 NPs	100	300	11.6	[88]
Fe2O3 NPs	100	340	9	[89]
ZnO NPs	100	230	33	[90]
ZnO NRs	100	300	32	[91]
Hollow ZnO NFs	100	220	70	[97]
Porous WO3 NFs	50	270	55.6	[98]
2D ZnO nanosheet	200	300	110	[92]