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H2 sensor based on tapered optical fiber coated with MnO2 nanostructures


Mohd Yahya, Nor Akmar and Yusof Hamid, Mohd Rashid and Ibrahim, Siti Azlida and Ong, Boon Hoong and Abdul Rahman, Norizah and Md Zain, Ahmad Rifqi and Mahdi, Mohd Adzir and Yaacob, Mohd Hanif (2017) H2 sensor based on tapered optical fiber coated with MnO2 nanostructures. Sensors and Actuators B: Chemical, 246. pp. 421-427. ISSN 0925-4005; ESSN: 1873-3077


A novel hydrogen (H2) sensor was developed using optical fiber coated with manganese dioxide (MnO2) nanostructures. Optical multimode fiber (MMF) of 125 μm in diameter as the transducing platform was tapered to 20 μm to enhance the evanescent field of the light propagates in the fiber core. The tapered fiber was coated with MnO2 nanograins synthesised via chemical bath deposition (CBD) process. Catalytic Palladium (Pd) was sputtered onto the MnO2 layer to improve the H2detection. The sensing layer was characterized through Field Emission Scanning Electron Microscopy (FESEM), Energy Dispersive X-ray (EDX), X-ray Diffraction (XRD) and Raman Spectroscopy to verify the properties of MnO2. Two sets of sensors consist of as-prepared MnO2 and 200 °C annealed MnO2 were tested towards H2 gas. The tapered optical fiber coated with Pd/MnO2 nanograins was found to be sensitive towards H2with different concentrations in synthetic air at 240 °C operating temperature. The annealed sensor showed higher response and sensitivity as compared to the as-prepared sensors when measured in the visible to near infra-red optical wavelength range. The absorbance response of the annealed Pd/MnO2 on fiber has increased to 65% as compared to 20% for the as-prepared Pd/MnO2 upon exposure to 1% H2in synthetic air.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Institute of Advanced Technology
DOI Number: https://doi.org/10.1016/j.snb.2017.02.084
Publisher: Elsevier
Keywords: Hydrogen sensor; Tapered optical fiber; Optical sensor; Absorbance response; Manganese dioxide nanostructures; Chemical bath deposition
Depositing User: Nurul Ainie Mokhtar
Date Deposited: 14 Mar 2019 08:35
Last Modified: 14 Mar 2019 08:35
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.snb.2017.02.084
URI: http://psasir.upm.edu.my/id/eprint/62001
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