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

Research Output

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.

Type:

Article
Date:

07 June 2019
Publication Status:

Published
DOI:

10.1109/JSEN.2019.2921701
ISSN:

1530-437X
Funders:

City, University of London

http://researchrepository.napier.ac.uk/output/1890986 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

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