Synthesis of SnO2 nanowires forCO, CH4 and CH3OH gases sensing

Khurram Shehzad, Nazar Abbas Shah, Muhammad Amin, Murrawat Abbas and Waqar Adil Syed

International Journal of Distributed Sensor Networks, 2018, vol. 14, issue 8, 1550147718790750

Abstract: Synthesis of one-dimensional nanostructures, such as nanowires, is of vigorous significance for achieving the desired properties and fabricating functional devices. In this work, we report the synthesis of tin oxide (SnO 2 ) nanowires on gold-catalyzed silicon substrate by carbothermal reduction process. SnO 2 nanowires were synthesized with SnO 2 and graphite powders as the source materials at atmospheric pressure and temperature of 900°C in the ambience of nitrogen (N 2 ) gas. First, the effect of source material ratio SnO 2 :C on growth of SnO 2 nanowires was studied. The structural, morphological and compositional properties of the samples were investigated by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The scanning electron microscopy investigation reveals that uniform dense nanowires of SnO 2 (diameter ~127 nm and length ~40 µm) were synthesized with vapour–liquid–solid mechanism. Ultraviolet–visible spectra estimate that the optical band gap of the synthesized SnO 2 nanowires was 3.72 eV. Second, the gas sensing performance of synthesized SnO 2 nanowires was investigated by testing with carbon monoxide (CO), Methane (CH 4 ) and methanol (CH 3 OH) gases at different operating temperatures and concentrations. Results indicate that the synthesized SnO 2 nanowires are highly promising for gas sensing applications.

Keywords: Nanowires; synthesis; sensing applications; optical band gap (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:sae:intdis:v:14:y:2018:i:8:p:1550147718790750

DOI: 10.1177/1550147718790750

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