Evolution and growth mechanism of hexagonal ZnO nanorods and their LPG sensing response at low operating temperature
| Autor: | Rakesh Malik, Siddharth Choudhary, S. Annapoorni |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Diffraction Fabrication Materials science Morphology (linguistics) Hexagonal crystal system Metals and Alloys 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Epitaxy 01 natural sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials Colloid Chemical engineering Operating temperature 0103 physical sciences Nanorod Electrical and Electronic Engineering 0210 nano-technology Instrumentation |
| Zdroj: | Sensors and Actuators A: Physical. 293:207-214 |
| ISSN: | 0924-4247 |
| Popis: | Liquefied Petroleum Gas (LPG) response of ZnO nanorods synthesized by a simple and low cost colloidal method is presented here. The morphology of ZnO was controlled by changing the refluxing time from 3 h to 48 h. The nanorods synthesized were characterized by X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM) for structural and morphological studies. The FESEM images shows hollow and solid nanorods with hexagonal cross-section on varying the reflux time. The origin and evolution of epitaxial growth along the (002) plane is explained by a two-step growth processes. The nanorods of different morphologies were exposed to low concentrations (below 100 ppm) of LPG and their sensing behavior was recorded over a range of operating temperatures from 120 °C to 200 °C. Hollow ZnO nanorods showed remarkable sensing characteristics such as higher gas sensitivity ˜ 49%, rapid response time (˜ 39 s) and recovery time (˜ 46 s). The nanorods were able to detect as low as 20 ppm of LPG at operating temperature of 120 °C. These results shows that the ZnO nanorods prepared by simple colloidal method could be a promising material for the fabrication of highly sensitive LPG sensor at low operating temperatures. |
| Databáze: | OpenAIRE |
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