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Lead (Pb2+) ion sensor development using optical fiber gratings and nanocomposite materials

Ghosh, S; Dissanayake, K; Asokan, S; Sun, T; Rahman, BMA; Grattan, KTV; (2022) Lead (Pb2+) ion sensor development using optical fiber gratings and nanocomposite materials. Sensors and Actuators B: Chemical , 364 , Article 131818. 10.1016/j.snb.2022.131818. Green open access

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Abstract

Research on compact, flexible optical sensors for water quality monitoring, specifically targeting heavy metal ion monitoring, has become extremely important due to the increasing number of water pollution incidents seen worldwide where such heavy metals are involved. Optical fiber-based sensors provide an excellent basis for creating new sensing solutions across a wide area, including for energy, healthcare, structural monitoring, defense and importantly here for environmental monitoring. An innovative, cost-optimized sensor solution to better heavy metal detection is proposed, by introducing a hybrid optical fiber grating sensor system based on concatenating a Long Period Grating (LPG) and Fiber Bragg Grating (FBG) for the concurrent detection of an important, specific heavy metal ion pollutant (in this case lead (Pb2+)). The approach uses the functionalization of an optical fiber grating with a chemically synthesized novel nanocomposite material (together with temperature sensing to allow such corrections to be applied). Such a method not only significantly enhances the system sensitivity (achieving 2.547 nm/nM), with a detection limit (0.5 nM), and high selectivity to the Pb2+ ions, but also mitigates the shortcomings of cross-sensitivity seen with many such sensors. Furthermore, in this work, the incorporation of a forward Artificial Neural Network (ANN)-based predictive algorithm has been incorporated to create an effective, well-calibrated system whose characteristics as an intelligent, highly sensitive system has been demonstrated in the detection of the sub-nanomolar concentration of Pb2+ ion in drinking water.

Type: Article
Title: Lead (Pb2+) ion sensor development using optical fiber gratings and nanocomposite materials
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.snb.2022.131818
Publisher version: https://doi.org/10.1016/j.snb.2022.131818
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Technology, Chemistry, Analytical, Electrochemistry, Instruments & Instrumentation, Chemistry, Long period grating, Fiber Bragg grating, Heavy metal ion sensor, Temperature sensor, Chemical sensor, Artificial Neural Network, Graphene oxide, Polymer, SURFACE-PLASMON-RESONANCE, HEAVY-METAL IONS, ZEHNDER INTERFEROMETER, TEMPERATURE SENSOR, MODE, POLYMER, BIOSENSOR, CHITOSAN, ANTIBODY, DESIGN
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery.ucl.ac.uk/id/eprint/10150764
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