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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