Table 1 Relative response of gas sensor array

From: Batch-processed semiconductor gas sensor array for the selective detection of NO_x in automotive exhaust gas

Concentration (ppm)			Relative response (ΔR/R)
NO₂	CO	NO	SnO₂-doped TiO₂	SnO₂	Ga₂O₃
Individual gas
50	0	0	1.99	2	0.792
100	0	0	2.5	2.46	1.81
200	0	0	3.6	3.41	2.55
0	50	0	−0.308	−0.454	0
0	100	0	−0.373	−0.503	0
0	200	0	−0.388	−0.611	−0.485
0	0	50	0.04	0.1	0.47
0	0	100	0.045	0.17	0.525
0	0	200	0.053	0.23	0.625
0	0	500	0.278	1.22	1.4
Mixture of gases
200	200	0	3	2.78	2.54
200	0	200	3.21	3.82	2.83
0	200	200	0.327	0.371	0.404
200	200	100	1.67	3	2.45
200	100	200	1.59	2.87	2.63
100	200	200	1.4	1.63	1.63
200	200	200	1.53	2.69	2.03
50	50	50	1.22	0.477	0.887
100	50	50	1.32	0.85	1.47
200	50	50	1.59	1.27	2.27
50	100	100	0.956	0.512	0.845
100	100	100	1.29	0.974	1.29
200	100	100	1.89	1.92	2.06

Results of gas sensor array upon exposure to various concentrations of individual gas and mixture of gases

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