Reduced Graphene Oxide nano-composites layer on fiber optic tip sensor reflectance response for sensing of aqueous ethanol

Abstract

In this study, the used of tapered optical fiber tip as sensors coated with reduced Graphene Oxide (rGO) is investigated. The resultant rGO nanocomposites coated on the tapered fiber sensor were characterized by X-ray Diffraction (XRD), Raman spectroscopy, and field emission scanning electron microscopy (FESEM). Optimization of the rGO layer and the tapering parameters are found and the sensing capability of the device is tested using different concentrations of ethanol in water. The nanocomposite layer improved the performance of the sensor by demonstrating high sensitivity to aqueous ethanol when interrogated in the visible region using a spectrometer in the optical wavelength range of 500-700 nm. The reflectance response of the rGO coated fiber tip reduced linearly, upon exposure to ethanol concentrations ranging between 20-80 %.

Graphene derivative coated QCM-based gas sensor for volatile organic compound (VOC) detection at room temperature

“…The positions of D-and G-band are significantly dependent on the defects, edges, disorder, grain size and microstructure of the graphene materials. The D-band of graphene indicates to the defects and G-band represents the sp 2 atomic arrangement of carbon atoms of graphene layers [26,27]. The relative intensity ratio ID / IG for rGO was found to be 1.295 indicates the presence of defects in rGO film [28].…”

Passively Q-switched erbium-doped fiber laser using coated reduced graphene oxide on arc-shaped single mode optical fiber as a saturable absorber

“…The S3 peak on the other hand arises from incomplete activated phonon groups [31]. The final peak at 950 cm −1 can be attributed to the second-order Raman scattering effect of silicon [31,32]. The silicon peak is present due to the silicon substrate base which was used during the characterization of the rGO sample, though it has no effect on this work.…”

“…These are identified as the 2D and S3 peaks respectively, with the 2D peak being an overtone of the D peak, and arising due to the sp 2 hybridization of the carbon atoms (C-C) in the graphene nanostructure [30]. The S3 peak on the other hand arises from incomplete activated phonon groups [31]. The final peak at 950 cm −1 can be attributed to the second-order Raman scattering effect of silicon [31,32].…”

Graphene-Based Environmental Sensors: Electrical and Optical Devices

“…The fiber tips were coated with rGO by drop casting and acted as the sensing layer for ethanol. The reflectance response of the rGO coated fiber tip reduced linearly, upon exposure to ethanol concentrations ranging between 20–80% [ 101 ]. Zhang et al reported a polymer optical fiber with graphene film deposited on the distal end of the optical fiber as an acetone sensor [ 102 ].…”