Table 4.
Summary of best performances of Pd NPs-based optical hydrogen gas sensors found in the literature.
| Sensing Material | Limit of Detection | Response Time | Recovery Time | T° | Ref. |
|---|---|---|---|---|---|
| Pd NPs/fused silica substrate | nr | 2s/5% | 5 s | RT | [15] |
| PdAu NPs/glass substrate | ~0.1% | <10 s/5% | <20 s | RT | [95] |
| Au@Pd NPs/quartz | ~0.1% | 4 s/4% | 30 s | RT | [10] |
| Pd NPs/glass substrate | <10 ppm | 32 s/4% | nr | RT | [12] |
| PdAu nanodisks/glass substrate | ~0.1% | <1 s/0.1–4% | nr | RT | [11] |
| PdAu NPs/optical microfiber | <1% | 2 s/4% | 20 s | RT | [100] |
| Pd NPs - PMMA/optical microfiber | ~35.8 ppm | 5 s/0.2–1% | nr | RT | [17] |
| Pd NPs/SnO2 waveguide | ~0.5% | 3 s/3% | 2 s | RT | [105] |