Ms. Anima Johari Profile

Anima Johari

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Proceedings Article | 15 October 2012 Paper

Low Temperature Tin Oxide (SnO2) Nanowire Gas Sensor

Anima Johari, M. Bhatnagar, V. Rana

Proceedings Volume 8549, 854915 (2012) https://doi.org/10.1117/12.924698

KEYWORDS: Nanostructures, Gold, Gas sensors, Tin, Oxides, Silicon, Sensors, Argon, Nanolithography, Nanowires

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In present work, we report the synthesis of SnO₂ nanowires on gold catalyzed silicon substrate and implementation of these grown SnO₂ nanowires as a sensing element for methanol sensing. The SnO₂ nanowires were synthesized by using thermal evaporation method. The growth of SnO₂ nanowires was carried out on gold catalyzed silicon (Au/Si) substrate by thermal evaporation of a mixture of SnO₂ and graphite powders in Argon (Ar) ambience at a temperature of 1050°C. The growth of SnO₂ nanowires takes place at atmospheric pressure. The surface morphology study reveals the growth of SnO₂ nanowires (diameter~ 300 nm, length~ 50 μm) on the Au coated silicon substrate. The XRD analysis concludes that synthesized SnO₂ nanostructures show polycrystalline nature with tetragonal rutile structure. The vapor-liquid-solid (VLS) growth mechanism of SnO₂ nanowires were also confirmed by EDX spectra. The SnO₂ nanowires were used to fabricate single SnO₂ nanowire based methanol gas sensor. The result reveals that the device exhibit the resistance change from 23 MΩ to 10 KΩ upon exposing to 200 ppm concentration of methanol gas at 100°C. This sensing behaviour offers a suitable application of the SnO₂ nanowire sensor for detection of methanol gas.

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