Table 2.

Comparison of the gas sensor properties of the present sensor with other sensors containing Cr₂O₃ and ɣFe₂O₃ NOS in their composition toward the H₂S gas.

Material	Optimum T (°C)	Response	Response times	Recovery times	Ref
Fe2O3/MoSe2	25	57.7	50	53	[16]
Fe2O3/ZnO	250	5.98			[18]
Cr2O3-TiO2	450	1.22	—	—	[21]
Fe2O3/NiO	200	8	100	10	[32]
Cr2O3-ɣFe2O3 (1:2)	200	16.1	16.2	48.6	This work