Mr. Kavinkumar T. Thangavelu Profile

Kavinkumar T. Thangavelu

Research Scholar at National Institute of Technology Tiruchirappalli

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Proceedings Article | 24 October 2014 Paper

Reduced graphene oxide coated optical fiber for methanol and ethanol vapor detection at room temperature

T. Kavinkumar, D. Sastikumar, S. Manivannan

Proceedings Volume 9270, 92700U (2014) https://doi.org/10.1117/12.2071841

KEYWORDS: Graphene, Bioalcohols, Oxides, FT-IR spectroscopy, Optical fibers, Raman spectroscopy, Cladding, Fiber optics sensors, Oxygen, Absorption

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Successful isolation of single layer of graphene from graphite by mechanical exfoliation method, attracted a great attention due to its unique structural, optical, mechanical and electronic properties. This makes the graphene as a promising material in many possible applications such as energy-storage, sensing, electronic, optical devices and polymer composite materials. High quality of reduced graphene oxide (rGO) material was prepared by chemical reduction method at 100°C. The structural and optical properties of the rGO sheets were characterized by FT-IR, micro Raman, powder XRD and UV-vis-NIR techniques. FT-IR reveals the absence of oxygen functional groups on rGO due to the reduction process. Powder XRD shows the broad peak at 2θ=24.3° corresponding to interlayer spacing 3.66Å which is smaller than the graphene oxide (GO). UV-vis-NIR of rGO displays the absorption peak at 271 nm indicates the reduction of GO and the restoration of C=C bonds in the rGO sheets. The cladding removed and rGO coated poly-methyl methacrylate (PMMA) optical fiber is used for methanol and ethanol vapors detection in the concentration ranging from 0 to 500 ppm at room temperature. The spectral characteristics along with output intensity modulation of cladding removed and rGO coated fiber optic sensor reveal the potential of methanol and ethanol vapor sensing properties.

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