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Highly Sensitive Hydrogen Sensor Based on Palladium-Coated Tapered Optical Fiber at Room Temperature
Mohammed Majeed Alkhabet 1 , Saad H. Girei 1, 2 , Suriati Paiman 3 , Norhana Arsad 4 , Mohd Adzir Mahdi 1 , Mohd Hanif Yaacob * 1
1  Wireless and Photonics Network Research Center, Faculty of Engineering, University Putra Malaysia,43000 UPM Serdang, Selangor, Malaysia
2  Department of Computer Engineering, Federal Polytechnic Mubi, Adamawa State, Nigeria.
3  Department of Physical, Faculty of Science, University Putra Malaysia, 43000, Serdang, Selangor, Malaysia
4  Department of Electrical, Electronic and System Engineering, Faculty of Engineering and Built Environment, University Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

10.3390/ecsa-7-08186
Abstract:

This paper describes the application of a palladium (Pd)-coated tapered optical fiber in order to develop hydrogen (H2) sensor. A transducing channel was fabricated with multimode optical fiber (MMF) with cladding and core diameters of 125 µm and 62.5 µm respectively, to enhance the evanescent field of light propagation through the fiber. The multimode optical fiber was tapered from cladding diameter of 125 µm to waist diameter of 20 µm, waist-length of 10 mm, and down taper and up of 5 mm and coated with Pd using drop-casting technique. In order to establish the palladium’s properties, various characterization techniques were applied such as FESEM, EDX and XRD. The developed palladium sensor functioned reproducibly at a gas concentration of 0.125% to 1.00% H2 at room temperature in the synthetic air. In this case, the response and recovery times were 50 and 200 seconds, respectively. Furthermore, this study demonstrated that the production of a dependable, effective, and reproducible H2 sensor by applying a basic cost-effective method is possible.

Keywords: Tapered Optical Fiber; Hydrogen (H2) ; Palladium (Pd) ; Drop-casting technique
Comments on this paper
Mahamod Al-nuami
Comment on this paper
The authors have a good and interesting idea for an argument in this paper . It is generally well written and structured.

Mahamod Al-nuami
Comment on this paper
The authors have a good and interesting idea for an argument in this paper . It is generally well written and structured.

Mohammed Alkhabet
Comment
Very good selectivity sensor for hydrogen gas. Nice work.


 
 
 
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