Tapered Optical Fiber for Hydrogen Sensing Application Based on Molybdenum trioxide (MoO3)

Mohammed M. Alkhabet; Saad Hayatu Girei; Suriati Paiman; Norhana Arsad; Mohd Adzir Mahdi; Mohd Hanif Yaacob

doi:10.3390/ecsa-8-11315

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Tapered Optical Fiber for Hydrogen Sensing Application Based on Molybdenum trioxide (MoO3)

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¹ Computer Center, University of Fallujah, Al-Fallujah, Iraq.
² Department of Medical Instrumentations Techniques Engineering , AL-Rasheed University College, Baghdad, Iraq.
³ Department of Computer Engineering, Federal Polytechnic Mubi, Adamawa State, Nigeria.
⁴ Wireless and Photonics Network Research Center, Faculty of Engineering, University Putra Malaysia,43000 UPM Serdang, Selangor, Malaysia
⁵ Department of Physics, Faculty of Science, University Putra Malaysia, 43400, Serdang, Selangor, Malaysia
⁶ Department of Electrical, Electronic and System Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

Academic Editor: Sabina Merlo

Published: 01 November 2021 by MDPI in 8th International Electronic Conference on Sensors and Applications session Optical Sensors

https://doi.org/10.3390/ecsa-8-11315

Abstract:

In this work, molybdenum trioxide (MoO₃) was synthesized and deposited on tapered optical fiber using the drop-casting technique for hydrogen (H₂) detection at room temperature. A transducing platform in a transmission mode was constructed using multimode optical fiber (MMF) with a 125 µm cladding and a 62.5 µm core diameter. To enhance the evanescent light field surrounding the fiber, the fibers were tapered from 125 µm in diameter to 20 µm in diameter with a 10 mm waist. The microstructures and chemical compositions of the fabricated sensor were analyzed by field emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX), differential X-ray (XRD), and atomic force microscopy (AFM). In addition, the gas detection properties of the fabricated sensor were studied by exposing it to various concentrations of hydrogen gas from 0.125% to 2.00%. As a result, the sensitivity, response, and recovery time were 11.96 vol%, 220 s, and 200 s, respectively. Overall, the fabricated sensor exhibits good sensitivity as well as repeatability and stability for hydrogen gas detection.

Keywords: Hydrogen (H2) gas; tapered optical fiber; evanescent wave; molybdenum trioxide (MoO3) and drop-casting technique.

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