Ion-Imprinted Chitosan-Based Interferometric Sensor for Selective Detection of Heavy Metal Ions

A photonic crystal fiber (PCF)-based Mach-Zehnder interferometric sensor using ion-imprinted chitosan for the detection of Ni 2+ ions is proposed and experimentally demonstrated. The sensor was fabricated by splicing a small section of the PCF between single-mode fibers. Nickel-adsorbed chitosan was...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-06, Vol.37 (11), p.2778-2783
Main Authors: Ravikumar, Raghunandhan, Li Han Chen, Hui, Melissa Meow Xin, Chi Chiu Chan
Format: Article
Language:English
Subjects:
Calcium ions
Chitosan
Copper
Crosslinking
Crystal fibers
Epichlorohydrin
fiber-optic interferometric sensor
heavy metal ion sensor
Heavy metals
Interferometry
ion imprinting
Ions
Metal ions
Nickel
Optical fiber sensors
photonic crystal fiber (PCF)
Photonic crystals
Refractive index
Sensitivity
Sensitivity analysis
Sensors
Splicing
Surface treatment
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Summary:A photonic crystal fiber (PCF)-based Mach-Zehnder interferometric sensor using ion-imprinted chitosan for the detection of Ni 2+ ions is proposed and experimentally demonstrated. The sensor was fabricated by splicing a small section of the PCF between single-mode fibers. Nickel-adsorbed chitosan was crosslinked with epichlorohydrin (ECH) to increase its mechanical strength, and thereby, to improve the sensor stability and was subsequently imprinted with Ni 2+ ions. The sensor was coated with nickel ion imprinted chitosan and was examined with test solutions of various Ni 2+ concentrations. The sensor exhibits a Ni 2+ detection sensitivity of 0.0632 nm/μM (nanometer per micromolar) in the linear range and a limit of detection of 0.57 μM. The cross sensitivity of the sensor was evaluated to other metal ions like Cu 2+ , Ca 2+ , and Na + and also by comparing its performance to a sensor using nonimprinted chitosan. Results have shown better sensor response to Ni 2+ ions over other metal ions and an improvement in performance over a nonimprinted chitosan sensor. Investigation was also carried out to examine the effect of crosslinking on the sensor performance by varying the ECH to the chitosan molar ratio (5:1, 10:1, and 15:1) and the sensor achieved its best performance when the molar ratio was 10:1.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2018.2874171