Table 2.
Comparison of the sensitivity, response and recovery times between the present sensor and other existing sensors operated at room temperature.
| reference | materials | operating voltage (V) | response time (s) | recovery time (s) | sensitivity (%)/ H2 (ppm) |
|---|---|---|---|---|---|
| this work | oriented ZnO nanorods | 6.0 | 60 | 49 | 33/2000 |
| Wang et al. [11] | ZnO nanorods | 0.5 | >300 | <20 | 5/500 |
| Hassan et al. [17] | ZnO nanorods | — | 400 | 187 | 0.4/20 000 |
| Kadhim et al. [29] | spin coat SnO2 | 0.2 | 192 | 95 | 2570/1000 |
| Fields et al. [32] | nanobelts SnO2 | 0.1 | 220 | — | 60/20 000 |
| Xiang et al. [26] | Pd/TiO2 nanotubes | — | 120 | 90 | 8/10 000 |
| Wang et al. [27] | Nb2O5 nanowires | — | 100 | 470 | 100/2000 |
| Hassan et al. [33] | ZnO nanorods | 0.1 | 176 | 116 | 500/1000 |