H 2 sensor based on tapered optical fiber coated with MnO 2 nanostructures


Yahya, Nor Akmar Mohd and Hamid, Mohd Rashid Yusof and Ibrahim, Siti Azlida and Ong, Boon Hoong and Rahman, Norizah Abdul and Zain, Ahmad Rifqi Md and Mahdi, Mohd Adzir and Yaacob, Mohd Hanif (2017) H 2 sensor based on tapered optical fiber coated with MnO 2 nanostructures. Sensors and Actuators B: Chemical, 246. pp. 421-427. ISSN 0925-4005

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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 H2 detection. 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 H2 with 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% H2 in synthetic air.

Item Type: Article
Uncontrolled Keywords: Hydrogen sensor, Tapered optical fiber, Optical sensor, Absorbance response, Manganese dioxide nanostructures, Chemical bath deposition
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 06 Aug 2020 03:02
Last Modified: 06 Aug 2020 03:02
URII: http://shdl.mmu.edu.my/id/eprint/7040


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