Table 2.
Comparison of the response time (tresponse) and recovery time (trecovery) between spherical and rod-like pristine and Au-doped ZnO at various NO2 concentrations.
| NO2 (ppm) |
ZnO 300 °C |
Au@ZnO 300 °C |
ZnO 550 °C |
Au@ZnO 550 °C |
| tresponse (s) | ||||
| 10 | 438 ± 30 | 336 ± 30 | 132 ± 25 | 240 ± 20 |
| 5 | 444 ± 30 | 474 ± 30 | 240 ± 25 | 300 ± 20 |
| 1 | 414 ± 30 | 486 ± 30 | 360 ± 30 | 420 ± 20 |
| 0.5 | 336 ± 30 | 450 ± 30 | 420 ± 30 | 450 ± 20 |
| trecovery (s) | ||||
| 10 | 792 ± 30 | 342 ± 30 | 1470 ± 30 | 654 ± 20 |
| 5 | 984 ± 30 | 754 ± 30 | 1320 ± 30 | 840 ± 20 |
| 1 | 540 ± 30 | 630 ± 30 | 1140 ± 30 | 936 ± 20 |
| 0.5 | 504 ± 30 | 587 ± 30 | 900 ± 30 | 1020 ± 20 |