Table 1.

Comparison of the sensing performance of various gas sensors toward NH₃.

Sensing Materials	C (ppm)	T (°C)	Response	τres/τrec (s)	LOD (ppm)	Ref.
NiO	150	300	141.3%	-/-	25	[33]
NiO-MoS2	20	RT	79	160/117	0.25	[6]
Pt/NiO	1000	300	1278	15/76	0.01	[34]
ZnO nanorod	100	650	22.6	-/-	20	[35]
ZnO thin films	600	150	57.5	660/160	50	[36]
Co-ZnO	100	RT	3.48	-/-	15	[37]
3%Er-doped ZnO	120	RT	97%	120/10	--	[38]
ZnO-CNTs	50	RT	171(Igas/Iair)	18/35	0.2	[39]
CNTs/rGO/ZnO	10	RT	~2.25	55/116	5	[40]
WO3/ZnO	300	250	25	60/50	25	[41]
ZnO/NiO nanofibers	100	RT	6	-/-	50	[42]
Zn1Ni2	100	280	25	16/7	0.05	This work

C: Gas concentration; T: Operating temperature; τ_res/τ_rec: Response/recovery time; LOD: Limit of detection; RT: Romm Temperature.