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

Table 3

Response, response time, and recovery time of Pd-Ag/ZnO Schottky sensor with different concentrations of CH₄ in nitrogen using unmodified and Pd modified ZnO thin films at the corresponding optimum temperatures and voltages (calculated from Figures 6(b) and 9(a)).

% of CH4	Response		Response time (s)		Recovery time (s)
	ZnO	Pd: ZnO	ZnO	Pd: ZnO	ZnO	Pd: ZnO
0.01	0.99	18.2	22.3	10.2	48.3	18.7
0.05	1.38	22.3	19.7	6.7	46.2	17.2
0.1	2.21	23.2	16.4	6.03	38.1	16.8
0.5	3.11	25.2	12.1	4.02	20.2	16.1
1	3.81	32.2	8.8	2.69	16	16.0