Optical Fiber-Based Heavy Metal Detection Using the Localized Surface Plasmon Resonance Technique

Dhara, Papiya; Kumar, Rahul; Binetti, Leonardo; Nguyen, Hien T.; Alwis, Lourdes S.; Sun, Tong; Grattan, Kenneth T. V.

Abstract

An innovative, reflection-based localized surface plasmon resonance (LSPR) fiber-optic sensor has been developed and demonstrated to detect the concentration of several heavy metal lead ions in an aqueous solution. By using a self-assembling technique, gold nanoparticles (Au NPs) have been immobilized on an optical fiber surface and functionalized with 1,1-Mercaptoundecanoic acid (MUA; HS(CH2)10CO2H) in order to make the fiber selective to each the important heavy metal ion, Pb2+ or Cd2+. The concentration of the heavy metal then can be determined from the link between binding rate and the shift of the LSPR resonance wavelength. The Pb2+ ion sensitivity of the sensor thus created has been determined to be 0.28 nm/mM, with a typical response time of 30 seconds. Importantly, the probe has been shown to be reversible through a simple process involving the use of Ethylenedinitrilotetraacetic acid (EDTA;(HO2CCH2)2NCH2 CH2N(CH2CO2H)2) chelator to remove the bound heavy metal ion.

Citation

Dhara, P., Kumar, R., Binetti, L., Nguyen, H. T., Alwis, L. S., Sun, T., & Grattan, K. T. V. (2019). Optical Fiber-Based Heavy Metal Detection Using the Localized Surface Plasmon Resonance Technique. IEEE Sensors Journal, 19(19), 8720-8726. https://doi.org/10.1109/JSEN.2019.2921701

• Journal Article Type: Article
• Acceptance Date: Jun 3, 2019
• Online Publication Date: Jun 7, 2019
• Publication Date: Oct 1, 2019
• Deposit Date: Jun 20, 2019
• Publicly Available Date: Jun 21, 2019
• Journal: IEEE Sensors Journal
• Print ISSN: 1530-437X
• Electronic ISSN: 1558-1748
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 19
• Issue: 19
• Pages: 8720-8726
• DOI: https://doi.org/10.1109/JSEN.2019.2921701
• Keywords: Instrumentation; Electrical and Electronic Engineering
• Public URL: http://researchrepository.napier.ac.uk/Output/1890986
• Contract Date: Jun 21, 2019