Tungsten oxide thin films: detection and trapping of hazardous gases
| Autor: | R.V. Godbole, Sunita Bhagwat, Amol S. Vedpathak, V.P. Godbole |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Polymers and Plastics Scanning electron microscope 020209 energy Catalyst support Metals and Alloys chemistry.chemical_element 02 engineering and technology Substrate (electronics) Chemical vapor deposition Tungsten 021001 nanoscience & nanotechnology Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials symbols.namesake Chemical engineering chemistry 0202 electrical engineering electronic engineering information engineering symbols Wafer Thin film 0210 nano-technology Raman spectroscopy |
| Zdroj: | Materials Research Express. 4:076401 |
| ISSN: | 2053-1591 |
| Popis: | Synthesis of tungsten (W) and tungsten tri-oxide (WO3) thin films on alumina substrate by a peculiar Red-ox reaction route using hot-filament chemical vapor deposition technique is described. The resulting tungsten and tungsten oxide films were characterized using various techniques such as x-ray diffraction (XRD), Raman spectroscopy and Scanning electron microscopy (SEM). XRD results revealed the complete conversion of cubic phase of pure tungsten into monoclinic phase of tungsten oxide. Raman spectroscopic analysis also confirmed the formation of WO3. SEM images show considerable alteration in morphology from well faceted particles to wafers when pure W-film was converted to WO3 film. The wafer like morphology of WO3 films is found to be suitable for gas sensing towards hazardous gases such as NO2 and NH3. The WO3 films showcased their highly responsive nature towards NO2 gas with exceptionally high gas sensitivity ~32. WO3 film demonstrated longer recovery time towards NO2 gas unlike NH3 gas making them attractive for their utilization in 'Newer application' such as a catalyst support material in catalytic converter devices which are potential representatives to arrest pollutant gases (NO2) getting flown into the living environment. |
| Databáze: | OpenAIRE |
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