Table 1.

Sensitivity, response time and recovery time of the sensor measured at different reverse bias voltages of −2, −4 and −6 V for different H₂ concentrations.

	–2 V			–4 V			–6 V
H2 (ppm)	ΔR/Ro (%)	response time (s)	recovery time (s)	ΔR/Ro (%)	response time (s)	recovery time (s)	ΔR/Ro (%)	response time (s)	recovery time (s)
2000	11.91	>300	>300	17.83	98	96	32.94	60	49
1800	7.39	>300	>300	9.05	100	100	19.44	59	49
1600	6.47	>300	>300	8.23	98	99	18.13	57	54
1400	4.09	>300	>300	5.00	99	98	10.82	60	65
1200	3.35	>300	>300	3.85	100	92	8.85	50	63
1000	2.30	>300	>300	3.03	92	100	5.25	47	53
800	2.03	>300	>300	1.99	93	100	4.32	53	65
600	2.11	>300	>300	1.32	>300	>300	2.78	50	50
400	1.38	>300	>300	1.24	>300	>300	1.93	54	62
200	1.50	>300	>300	1.02	>300	>300	2.37	50	65