Sensor materials	Con (ppm)	Selectivity	Gas response	Synthetic method	Ref.
3D porous flower-like SnO₂	500	ethanol	208	HM	[22]
α-Fe₂O₃/SnO₂	100	ethanol	22.46	ES	[23]
Porous SnO₂ nanowires	100	ethanol	~1.7	EF, HM	[24]
GO/SnO₂ nanosheets	100	ethanol	2.9	HM	[25]
WO₃-SnO₂nanosphere composites	1000	acetone	16.9	HM	[26]
La-doped SnO₂ nanoparticles	5	formaldehyde	4.2	BM	[27]
Porous flower-like SnO₂	100	formaldehyde, ethanol	24.8	HM	[28]
Hollow ZnO-SnO₂	100	ethanol	392.29	ES	[29]
SnO₂ nanoparticles	100	ethanol	27	HM	this work