Optimization of Working Conditions for Perovskite-Based Gas Sensor Devices by Multiregression Analysis

Table 1

Full-factorial design with three factors and three levels for fractional sensitivity, FS, and normalized response rate, rFS. Model matrix column shows the surrogate variables, which are X₁, X₂, and X₃; experimental matrix column shows the real variables, which are oven temperature, inlet-gas flow rate, and carbon monoxide concentration; response column shows the values of fractional sensitivity and normalized response rate, respectively.

	Model matrix			Experimental matrix			Response
	X1	X2	X3	T (°C)	φ (cm^3/min)	C (ppm)	FS (%)	rFS (% S^−1)
ex1	−1	−1	−1	300	40	100	14.6 ± 0.6	0.08 ± 0.03
ex2	−1	−1	1	300	40	200	15.7 ± 0.6	0.14 ± 0.03
ex3	1	−1	−1	460	40	100	20.0 ± 0.6	0.11 ± 0.03
ex4	1	−1	1	460	40	200	60.2 ± 0.6	0.28 ± 0.03
ex5	−1	1	−1	300	100	100	22.7 ± 0.6	0.15 ± 0.03
ex6	−1	1	1	300	100	200	24.2 ± 0.6	0.23 ± 0.03
ex7	1	1	−1	460	100	100	19.6 ± 0.6	0.22 ± 0.03
ex8	1	1	1	460	100	200	65.9 ± 0.6	0.48 ± 0.03
ex9	−1	0	−1	300	70	100	18.3 ± 0.6	0.13 ± 0.03
ex10	−1	0	1	300	70	200	18.7 ± 0.6	0.15 ± 0.03
ex11	1	0	−1	460	70	100	33.3 ± 0.6	0.30 ± 0.03
ex12	1	0	1	460	70	200	103.4 ± 0.6	0.51 ± 0.03
ex13	0	−1	−1	380	40	100	103.7 ± 0.6	0.74 ± 0.03
ex14	0	−1	1	380	40	200	222.7 ± 0.6	1.41 ± 0.03
ex15	0	1	−1	300	100	100	204.9 ± 0.6	1.72 ± 0.03
ex16	0	1	1	460	100	200	276.8 ± 0.6	2.26 ± 0.03
ex17	−1	−1	0	300	40	150	15.2 ± 0.6	0.12 ± 0.03
ex18	1	−1	0	460	40	150	32.1 ± 0.6	0.14 ± 0.03
ex19	−1	1	0	300	100	150	21.5 ± 0.6	0.21 ± 0.03
ex20	1	1	0	460	100	150	37.8 ± 0.6	0.32 ± 0.03
ex21	0	0	−1	380	70	100	128.0 ± 0.6	0.71 ± 0.03
ex22	0	0	1	380	70	200	260.0 ± 0.6	0.91 ± 0.03
ex23	−1	0	0	300	70	150	19.4 ± 0.6	0.15 ± 0.03
ex24	1	0	0	460	70	150	67.9 ± 0.6	0.60 ± 0.03
ex25	0	−1	0	380	40	150	125.0 ± 0.6	0.81 ± 0.03
ex26	0	1	0	380	100	150	228.0 ± 0.6	1.78 ± 0.03
ex27	0	0	0	380	70	150	221.0 ± 0.6	1.80 ± 0.03