Abstract
ZnO nanostructures with various aspect ratios have been synthesized for H2 gas detection applications. The thermal-decomposition method was employed at different annealing temperatures (350, 450, and 550 °C) and its impact on various shapes/sizes of ZnO nanostructures is demonstrated. Thermal decomposition performed at 350 °C exhibited a maximum (∼6.25) aspect ratio among them. Its capability of H2 sensing was also observed to be maximum by realizing ∼483% of sensor response at 180 °C under H2 gas concentration of 80 ppm. The sensor response is ∼3 times (∼177%) and ∼9 times (∼53%) higher at ZnO nanostructure synthesized at 350 °C than at 450 °C, and 550 °C, respectively. The higher sensor response has been attributed to the increased availability of active surface area for adsorption/desorption of gas molecules. ZnO@350 nanostructure showed significantly higher selectivity towards H2 gas than other target chemical inputs. We have also studied H2-induced metallization on the surface of ZnO nanostructures which plays an important role for improving the selectivity and sensor response. This study provides insight into the role of aspect-ratio-controlled shape/sized ZnO in improving H2 gas sensing.
Original language | English |
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Pages (from-to) | 768-779 |
Number of pages | 12 |
Journal | International Journal of Hydrogen Energy |
Volume | 84 |
DOIs | |
State | Published - 26 Sep 2024 |
Keywords
- H gas sensor
- Rietveld refinement
- Thermal decomposition method
- ZnO nanostructure