Table 2.
Gas-sensing properties of RT-based gas sensors.
| Sensing materials | Target gas/concentration | Response time/recovery time | Response [Ra/Rg or Rg/Ra] or *[(Ra-Rg/Ra) × 100] | Ref. |
|---|---|---|---|---|
| WO3 hollow spheres | NO2 (0.3 ppm) | 670 s/2940 s | 15.1 | [152] |
| CuO nanosheets | H2 S (0.01 ppm) | 234 s/76 s | 1.25 | [ 135] |
| Au loaded ZnO nanostars | CO (500 ppm) | 41 s-/40 s | 55.3 | [160] |
| Pt-PdO NWs | H2 (10 ppm) | 166 s | 62%* | [163] |
| NiO-SnO2 nanocomposites | C2H5OH (100 ppm) | 23 s/13 s | 140 | [139] |
| In2O3-CuO composite nanofibers | NH3 (100 ppm) | 2 s/- | 1.57 | [141] |
| ZnO/SnO2-rGO nanocomposite | NO2 (5 ppm) | 32 s/92 s | 141%* | [167] |
| Fe3O4@SiO@rGO nanospheres | NO2 1 ppm |
250s/-- | 429% | [168] |
| MoS2/ZnO p-n heterojunction | NO2 (5 ppm) | 40 s/-- | 30.5% | [172] |
| Au-loaded MOS2 | Acetone (120 ppm) | 105 s/160 s | 42.2% | [173] |
| TiO2/Ti3C2Tx Mxene composite |
NH3 (10 ppm) | 33 s/277 s | 3.1% | [148] |
| SnO2/PPy nanofibers | NH3 (0.1 ppm) | 18 s/30 s | 57% | [190] |
| UV irradiated ZnO nanofibers | HCHO (365 nm UV light) | – | 12.61 | [73] |
| rGO/Ti3C2Tx Flexible composite |
NH3 (100 ppm) | 4.2 min/13.3 min | 6.7% | [150] |
| In2O3/rGO composite | NO2 (1 ppm) | – | 31.6% | [185] |
| PEDOT:PSS/rGO nanocomposite | (NH3) 1000 ppm |
– | 18.9% | [209] |
| SWNT/Fe2O3 composite films | (NH3) 200 ppm |
250 s/350 s | 4% | [212] |