Tapered optical fibre coated with chitosan for lead (II) ion sensing


Ibrahim@Ghazali, Siti Azlida and Ridzwan, A. H. and Dambul, Katrina D. and Mansoor, Amilia (2016) Tapered optical fibre coated with chitosan for lead (II) ion sensing. Electronics Letters, 52 (12). pp. 1049-1050. ISSN ISSN 0013-5194; eISSN: 1350-911X

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This Letter reports a lead (II) ion sensor composed of a tapered multimode fibre (MMF) coated with chitosan. The diameter and length of the tapered fibre region is 20 μm and 1 cm, respectively. Tapered MMF is used because it is more flexible and compact compared with plastic clad silica. Chitosan is chosen as the sensing layer because it can absorb heavy metal ions due to its unique properties as polyelectrolyte and chelating agent. The refractive index of the chitosan layer changes as it absorbs lead (II) ion and this leads to an increase in the absorbance measured by the spectrophotometer. This is tested by immersing the sensor in a solution that contains lead (II) ion with different concentrations, from 0.2 to 1 ppm. The results show that the absorbance measured by the spectrophotometer increased as the concentration of the lead (II) ion increased. The sensor's average sensitivity is measured as 40.554 abs/ppm. This sensor is simpler compared with surface plasmon resonance-based lead (II) ion sensor because it does not require metal coating prior to the sensing layer coating.

Item Type: Article
Uncontrolled Keywords: Optical materials; Optical refractometry and reflectometry; Chemical variables measurement; Chemical sensors; Optical variables measurement; Optical coatings; Optical coatings and filters; Fibre optic sensors; fibre gyros; Optical propagation, transmission and absorption; Optical materials; Chemical sensors; Fibre optic sensors
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA1501-1820 Applied optics. Photonics
Divisions: Faculty of Engineering (FOE)
Depositing User: Ms Suzilawati Abu Samah
Date Deposited: 07 Dec 2017 10:34
Last Modified: 07 Dec 2017 10:34
URII: http://shdl.mmu.edu.my/id/eprint/6565


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