Highly Sensitive and Selective Ethanol Sensor Based on ZnO Nanorod on SnO2 Thin Film Fabricated by Spray Pyrolysis
| Autor: | Sheikh A. Akbar, A.S.M.A. Haseeb, T. Tharsika, Murugathas Thanihaichelvan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Fabrication Nanostructure Hydrogen thin film Materials Science (miscellaneous) chemistry.chemical_element 02 engineering and technology Zinc Substrate (electronics) 010402 general chemistry 01 natural sciences lcsh:Technology gas sensor Thin film lcsh:T 021001 nanoscience & nanotechnology nanorod 0104 chemical sciences chemistry Chemical engineering ZnO Nanorod 0210 nano-technology Tin spray pyrolysis SnO2 |
| Zdroj: | Frontiers in Materials, Vol 6 (2019) |
| ISSN: | 2296-8016 |
| DOI: | 10.3389/fmats.2019.00122 |
| Popis: | This work reports the fabrication of mixed structure of ZnO nanorod on SnO2 thin film via spray pyrolysis followed by thermal annealing and their gas sensing properties. ZnO/SnO2 nanostructures are successfully prepared on a gold interdigitated alumina substrate by spraying varying mixed precursor concentrations of zinc acetate and tin (IV) chloride pentahydrate solutions in ethanol and thermal annealing. The morphology of the nanostructures is controlled by tailoring the Zn:Sn ratio in the precursor solution mixture. Unique ZnO crystals and ZnO nanorods are observed under a field emission scanning electron microscopy (FESEM) when the Zn/Sn ratio in the precursor solution is in between 13:7 and 17:3 after thermal annealing. The fabricated nanostructures are tested for ethanol, methane and hydrogen in air ambient for various gas concentrations ranging from 25 to 400 ppm and the effect of fabrication conditions on the sensitivity and selectivity are studied. Among the nanostructure sensors studied, the film fabricated with molar ratio of Zn/Sn =3:1 shows better sensitivity and selectivity to ethanol due to high sensing surface area of the nanorod. The response to 25 ppm ethanol is found to be as high as 50 at an operating temperature of 400°C. |
| Databáze: | OpenAIRE |
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