Enhanced room-temperature ammonia vapor-sensing activity of nebulizer spray pyrolysis fabricated SnO2 thin films: an effect of Er doping
| Autor: | S. Maheswari, Mohd. Shkir, L. Bruno Chandrasekar, S. AIFaify, M. Karunakaran, K. Kasirajan, K. Hariprasad, Thamraa Alshahrani |
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| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Photoluminescence Dopant Band gap Mechanical Engineering Doping Analytical chemistry chemistry.chemical_element 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics Tin oxide 01 natural sciences Erbium chemistry Mechanics of Materials 0103 physical sciences General Materials Science Crystallite Thin film 0210 nano-technology |
| Zdroj: | Journal of Materials Research. 36:657-667 |
| ISSN: | 2044-5326 0884-2914 |
| DOI: | 10.1557/s43578-020-00033-0 |
| Popis: | In this work, we have coated 0, 1, 3, and 5 wt% of Erbium (Er)-doped tin oxide (SnO2) films on glass using a simple nebulizer spray pyrolysis method to make an ammonia vapor sensor with remarkable sensitivity. X-ray diffraction, Atomic force microscopy, Ultraviolet–visible spectroscopy and photoluminescence methods were employed to inspect the thin-film samples. Room-temperature ammonia vapor sensing was performed by a computer connected to the homemade gas-sensing system. The results obtained show that Er doping in SnO2 films gradually decreased the crystallite size with an increase of the surface area improving the sensing property of the vapor. A minimum optical band gap (i.e., 3.23 eV) is achieved for 5 wt% Er-doped film. The fabricated Er-doped SnO2 gas sensor showed response/recovery time highly dependent on dopant concentration. The Er concentration of 5 wt% doped SnO2 thin film showed maximum sensitivity of 91%, fast response, and recovery time of 29 and 7 s, respectively, due to high surface to volume ratio. |
| Databáze: | OpenAIRE |
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