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Preparation of Surface Modified Multi-Walled Carbon Nanotubes Based Thin-Film Gas Sensor

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Over the years there has been a drastic increase in the manufacture of carbon nanotube based products owing to its demand; which has lead to a substantial proportion of research being caried out in this specific field. In this paper we surface modified MWCNTs using SnO2. It was found to enhance the sensing properties of MWCNTs by physisorption to detect gases/volatile compounds. The gas that we employed to study the sensing properties of the developed sensor was C2H5OH. The MWCNTs themselves have a bounteous surface area to react, and the metal oxide sitting on the surface sort out the absorption mechanism effectively. The surface modification is done by hydrothermal method which is a cost-effective and a modest technique. The as prepared thin film gas sensor was characterised using UV, PL, XRD, SEM, EDAX, AFM and NI Toolkit. The UV studies were carried out to find its absorption, transmittance, direct and indirect bandgap. PL studies gave the emission spectra details and confirmed the splitting of the energy levels, which is a size dependent property. The XRD structural studies confirms formation of SnO2. The surface modification of MWCNTs by the SnO2 was confirmed through SEM images. AFM images reveals the surface morphology and roughness of the thin film. The gas sensing property of the as prepared thin film sensor was studied using National Instruments Integrated Analyser NI PXI 1022.
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Keywords: GAS SENSING; MWCNTS; SNO2; SURFACE MODIFICATION

Document Type: Research Article

Publication date: 01 December 2016

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  • Journal of Advanced Microscopy Research (JAMR) provides a forum for rapid dissemination of important developments in high-resolution microscopy techniques to image, characterize and analyze man-made and natural samples; to study physicochemical phenomena such as abrasion, adhesion, corrosion and friction; to perform micro and nanofabrication, lithography, patterning, micro and nanomanipulation; theory and modeling, as well as their applications in all areas of science, engineering, and medicine.
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