Performance of NO sensors based on different sensing materials.
| Material | NO (ppm) | Response | Working temperature (°C) | LOD (ppb) | Humidity (RH%) | t Resp/tReco (s) | Ref. |
|---|---|---|---|---|---|---|---|
| Villi-like WO3 | 1 | 275 | 200 | 0.08 | 80 | 100/20 | 9 |
| 0.1Pd–WO3 | 20 | 164.4 | 200 | — | — | 185/400 | 37 |
| ZnO nanobelt | 50 | 6.5 | 28 | 500 | — | 200/250 | 43 |
| ZnO/CdO (2.8 : 1) nanofibers | 3 | 1.7 | 215 | 1200 | Ignorable | 47/1249 | 38 |
| ZnO nanofibers | 12 | 7 | 200 | — | — | 400/1200 | 44 |
| In2O3–ZnO | 10 | 8 | 100 | 12 | — | 210/2700 | 45 |
| Nanospiral ZnO | 0.09 | 14 | 150 | 10 | 80 | 60/700 | This work |
| Dense ZnO | 0.09 | 2 | 150 | 40 | 80 | ∼100/∼1500 | This work |