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Table 1 The response values and response/recovery times of all samples when exposed to 10 and 50 ppm NH₃. The results show that ZnO/rGO bilayer thin film sensors exhibit superior sensing properties than bare rGO one, and the optimal GO amount is 1.5 ml

From: ZnO Nanoparticles/Reduced Graphene Oxide Bilayer Thin Films for Improved NH₃-Sensing Performances at Room Temperature

Sensors	Response value (%)		Response time (s)		Recovery time (s)
	10 ppm	50 ppm	10 ppm	50 ppm	10 ppm	50 ppm
rGO	0.38	1.08	108	92	278	268
ZnO/rGO-0.5	0.44	1.22	102	86	274	256
ZnO/rGO-1.0	0.95	2.38	88	82	208	219
ZnO/rGO-1.5	1.20	3.05	78	84	188	216
ZnO/rGO-2.0	1.16	2.81	80	75	160	212
ZnO/rGO-2.5	0.92	2.30	82	68	183	223

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