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Hierarchical heterostructures consisting of W18O49 nanowires grown on SnO2 nanowires have been prepared by sequential thermal evaporation of tin and tungsten under partial oxygen atmosphere. Sensors made using isolated heterostructure nanowires showed superior selectivity for detection of chlorine in comparison to isolated pure SnO2 nanowires as well as mat type films prepared using heterostructure nanowires. Improved response compared to mat type films arises due to different sensing mechanisms of chlorine arising from its adsorption or replacement of oxygen. On the other hand better selectivity in comparison to isolated SnO2 nanowires has been attributed to transfer of electrons across hetero-junction from...
| Authors: | Shashwati, Sen , Prajakta, Kanitkar , Ankit, Sharma , K.P., Muthe , Ashutosh, Rath , ... | |
| Journal: | Sensors and Actuators B: Chemical | |
| Year: | 2010 | |
| DOI: | 10.1016/j.snb.2010.04.016 | |
| Publication date: | 18-04-2010 |
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