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http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1594
Title: | Enhanced ethanol gas sensing properties of SnO2-Core/ZnO-Dhell Nanostructures |
Authors: | Thanihaichelvan, T. Haseeb, A.S.M.A. Akbar, S.A. Sabri, M.F.M. Hoong, W.Y. |
Keywords: | ethanol gas sensor;hierarchical nanostructures;ZnO; SnO2; |
Issue Date: | 2014 |
Publisher: | sensors |
Citation: | Tharsika, T., Haseeb, A. S. M. A., Akbar, S. A., Sabri, M. F. M., & Hoong, W. Y. (2014). Enhanced ethanol gas sensing properties of SnO2-core/ZnO-shell nanostructures. Sensors, 14(8), 14586-14600. |
Abstract: | An inexpensive single-step carbon-assisted thermal evaporation method for the growth of SnO2-core/ZnO-shell nanostructures is described, and the ethanol sensing properties are presented. The structure and phases of the grown nanostructures are investigated by field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. XRD analysis indicates that the core-shell nanostructures have good crystallinity. At a lower growth duration of 15 min, only SnO2 nanowires with a rectangular cross-section are observed, while the ZnO shell is observed when the growth time is increased to 30 min. Core-shell hierarchical nanostructures are present for a growth time exceeding 60 min. The growth mechanism for SnO2-core/ZnO-shell nanowires and hierarchical nanostructures are also discussed. The sensitivity of the synthesized SnO2-core/ZnO-shell nanostructures towards ethanol sensing is investigated. Results show that the SnO2-core/ZnO-shell nanostructures deposited at 90 min exhibit enhanced sensitivity to ethanol. The sensitivity of SnO2-core/ZnO-shell nanostructures towards 20 ppm ethanol gas at 400 °C is about ~5-times that of SnO2 nanowires. This improvement in ethanol gas response is attributed to high active sensing sites and the synergistic effect of the encapsulation of SnO2 by ZnO nanostructures. |
URI: | http://repo.lib.jfn.ac.lk/ujrr/handle/123456789/1594 |
Appears in Collections: | Interdisciplinary Studies |
Files in This Item:
File | Description | Size | Format | |
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Enhanced Ethanol Gas Sensing_2014.pdf | 369.37 kB | Adobe PDF | View/Open |
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