Selective detection of cadmium ions using plasmonic optical fiber gratings functionalized with bacteria.

Optics Express
Shunshuo CaiChristophe Caucheteur

Abstract

Environmental monitoring and potable water control are key applications where optical fiber sensing solutions can outperform other technologies. In this work, we report a highly sensitive plasmonic fiber-optic probe that has been developed to determine the concentration of cadmium ions (Cd2+) in solution. This original sensor was fabricated by immobilizing the Acinetobacter sp. around gold-coated tilted fiber Bragg gratings (TFBGs). To this aim, the immobilization conditions of bacteria on the gold-coated optical fiber surface were first experimentally determined. Then, the coated sensors were tested in vitro. The relative intensity of the sensor response experienced a change of 1.1 dB for a Cd2+ concentration increase from 0.1 to 1000 ppb. According to our test procedure, we estimate the experimental limit of detection to be close to 1 ppb. Cadmium ions strongly bind to the sensing surface, so the sensor exhibits a much higher sensitivity to Cd2+ than to other heavy metal ions such as Pb2+, Zn2+ and CrO42- found in contaminated water, which ensures a good selectivity.

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Sep 14, 2019·Optics Letters·Shunshuo CaiChristophe Caucheteur
Oct 14, 2019·Biosensors & Bioelectronics·Marzhan SypabekovaDaniele Tosi

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Citations

Sep 10, 2020·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Psang Dain Lin
Jul 1, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·S GirijaJ Wilson

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