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Journal of Biomedical Optics

Ion-imprinted nanoparticles for the concurrent estimation of Pb(II) and Cu(II) ions over a two channel surface plasmon resonance-based fiber optic platform
Author(s): Anand Mohan Shrivastav; Banshi D. Gupta
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Paper Abstract

We report the design, fabrication, and characterization of an optical fiber sensor based on the surface plasmon resonance (SPR) technique for the simultaneous determination of lead (Pb) and copper (Cu) metal ions in aqueous samples. Two cascade channels over a single optical fiber are fabricated by removing cladding from two well-separated regions of the fiber. SPR working as a transducing mechanism for the sensor is realized by coating thin films of copper and silver over unclad cores of channel I and channel II, respectively. Ion-imprinted nanoparticles for both ions are separately synthesized and coated over the metal-coated unclad cores of the fiber as the recognition layers for sensor fabrication. A first channel having layer of Pb(II) ion-imprinted nanoparticles detects Pb(II) ions and a second channel having layer of Cu(II) ion-imprinted nanoparticles are used for the detection of Cu(II) ions. Both channels are characterized using the wavelength interrogation method. The sensor operates in the range between 0 to 1000    μ g / L and 0 to 1000    mg / L for Pb(II) and Cu(II) ions, respectively. These ranges cover water resources and the human body for these ions. The sensitivities of channel I and channel II are found to be 8.19 × 10 4    nm / ( μ g / L ) and 4.07 × 10 5    nm / ( mg / L ) near the lowest concentration of Pb(II) and Cu(II) ions, respectively. The sensor can detect concentrations of Pb(II) and Cu(II) ions as low as 4.06 × 10−12 g/L and 8.18 × 10−10 g/L, respectively, which are the least among the reported values in the literature. Further, the probe is simple, cost effective, highly selective, and applicable for online monitoring and remote sensing.

Paper Details

Date Published: 8 January 2018
PDF: 8 pages
J. Biomed. Opt. 23(1) 017001 doi: 10.1117/1.JBO.23.1.017001
Published in: Journal of Biomedical Optics Volume 23, Issue 1
Show Author Affiliations
Anand Mohan Shrivastav, Indian Institute of Technology Delhi (India)
Banshi D. Gupta, Indian Institute of Technology Delhi (India)

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