Schottky Junction Methane Sensors Using Electrochemically Grown Nanocrystalline-Nanoporous ZnO Thin Films

Table 4

Response, response time, and recovery time of Pd modified Pd-Ag/ZnO Schottky sensor with different concentrations of CH₄ in nitrogen and in synthetic air as the carrier gas (calculated from Figure 9).

% of CH4	Response		Response time (s)		Recovery time (s)
	N2 as carrier gas	Synthetic air as carrier gas	N2 as carrier gas	Synthetic air as carrier gas	N2 as carrier gas	Synthetic air as carrier gas
0.01	18.2	6.8	10.2	13.8	18.7	20.0
0.05	22.3	11.0	6.7	9.9	17.2	19.7
0.1	23.2	17.0	6.03	8.7	16.8	17.7
0.5	25.2	17.8	4.02	7.2	16.1	17.0
1	32.2	24.8	2.69	4.6	16.0	15.9