Optical Sensing Performance of Multimode Polymer Optical Fiber (POF) Coated with ZnO towards Methanol Vapour

Abstract

Abstract. In this work, optical sensing performance of multimode polymer optical fiber coated with ZnO towards methanol vapour with different concentrations is studied. The etching process of the POF was carried out using chemical etching method. ZnO was synthesized with sol-gel method to obtain the sensitive material coating. The etched optical fiber was then dipcoated with ZnO and dried at 70oC to enhance the binding of the materials and to remove organic residue. Scanning Electron Microscope (SEM), and X-Ray poer Difraction (XRD) analyses were performed to characterize the ZnO layer. The measurements of optical performance were taken using a spectrophotometer in the optical wavelength in the range of 500-8000nm. The absorbance response of the ZnO coated etched fiber reduced proportionally, upon exposure to methanol vapour with concentration in the range of 5%-50%.

Label-Free Detection of Dissolved Carbon Dioxide Utilizing Multimode Tapered Optical Fiber Coated Zinc Oxide Nanorice

“…To ensure a good performance of the sensor, various concentrations of ZnO nanorice coated on the surface of the tapered optical fiber is studied. Various concentrations of the ZnO nanorice solutions used affect the distribution of the ZnO nanorice on the surface of the tapered optical fiber [22]. Figure 7 shows the sensor response of different ZnO nanorice coating concentrations at (a) 0.1 M, (b) 0.5 M and (c) 1.0 M for detection of dCO 2 .…”