Comparison between our work and recently published research (2017–2020) on methane gas sensorsa.
| Materials used | Operating temperature/substrate | Methane gas concentration | Sensing response | Response/recovery time | Reference |
|---|---|---|---|---|---|
| α-Fe2−xCuxO3 nanoparticles | RT/NF | 1000 ppm | 1.03 | Data not available | 4 |
| NiO/ZnO nanosheets | 340 °C/NF | 1000 ppm | 34.2% | 7/33 s | 5 |
| SnO2/WO3nanoplates | 110 °C/NF | 500 ppm | 2.85 | Data not available | 7 |
| SnO2/Pt/MWCNTs | RT/NF | 100 ppm | 28.25% | 176/763 s | 40 |
| SnO2@rGO-PANI | RT/NF | 100 ppm | 26.1% | Data not available | 42 |
| Li+/CNTs | RT/NF | 500 ppm | 14.5% | Data not available | 43 |
| NiO/In2O3 nanocomposites | 120 °C/NF | 500 ppm | 13% | Data not available | 44 |
| α-Fe2−xCuxO3 | RT/NF | 2000 ppm | 50% | Data not available | 45 |
| Graphene–AgNPs | RT/NF | 2000 ppm | 12% | Data not available | 46 |
| NiO:Al thin films | RT/NF | 100 ppm | 58% | 1373/95 s | 47 |
| TiO2 nanorods | RT/NF | 60 ppm | 6068 | 60/100 s | 48 |
| Pd-doped SnO2/rGO | RT/NF | 800–16 000 ppm | 0.5–10% | 5/7 min | 49 |
| g-C3N4/ZnO | 320 °C/NF | 1000 ppm | 11.9% | 15/28 s | 50 |
| ZnO decoration with Zn2SnO4 | 250 °C/NF | 400 ppm | 81.38% | 10/30 s | 51 |
| Pd modified ZnO nano sheets | 200 °C/NF | 100 ppm | 8.65 | Data not available | 52 |
| PEDOT-PSS:DMSO:Zonyl:AuNPs treated with H 2 SO 4 | RT/F | 20–1000 ppb | 8.6 @ 1000 ppb (∼760%) | 22/43 s @ 800 ppb | Present work |
a
*NF- non flexible substrate, F-flexible substrate.