NiO-Based Gas Sensors for Ethanol Detection: Recent Progress

Table 4

Gas performance of NiO/metal oxide-based composites.

Material	Conc. (ppm)	Operating temp (°C)	Response	Response/recovery time (s/s)	LOD (ppm)	References
NiO/SnO2	100	160	13.4	-/-	—	[112]
NiO/SnO2	100	RT	140	23/13	1	[111]
NiO/SnO2	100	160	23.87	57/66	—	[113]
NiO/SnO2	50	300	9	-/-	5	[114]
NiO/SnO2	1000	250	123.7	10/58	—	[115]
NiO/SnO2	1000	150	84.7	5/15	—	[116]
NiO/SnO2	100	260	153	-/-	5	[117]
NiO/SnO2	1000	320	576.5	9/34	—	[118]
NiO/SnO2	100	75	248	-/-	—	[67]
NiO/ZnO	100	260	61	-/-	—	[101]
NiO/ZnO	100	200	11.3	4/78	—	[63]
NiO/ZnO	100	350	54	-/-	—	[102]
NiO/ZnO	200	300	33	-/-	—	[103]
NiO/ZnO	250	RT	32.48%	2.7/3.6	—	[105]
NiO/ZnO	500	400	37.5	2.1/4.1	—	[106]
NiO/ZnO	100	325	16	13/498	—	[108]
NiO/ZnO	20	200	49	4/28	3	[110]
NiO/WO3	100	300	58.2	-/-	—	[119]
NiO/WO3	200	175	155%	19/20	—	[120]
NiO/WO3	200	320	10	-/-	—	[121]
NiO/Fe2O3	100	255	170.7	0.5/14.6	0.2	[124]
NiO/In2O3	100	280	4.61	-/27	—	[125]
NiO/In2O3	5	350	9.76	-/23	2	[126]
NiO/Co2O3	100	250	4.26	-/-	0.073	[135]