Journal
OPTICS EXPRESS
Volume 28, Issue 13, Pages 19740-19749Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.397505
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Funding
- Fonds De La Recherche Scientifique - FNRS [O001518F]
- National Outstanding Youth Science Fund Project of National Natural Science Foundation of China [61722505]
- China Scholarship Council [201706060216, 201806780010]
- Natural Science Foundation of Guangdong Province [2018B030311006]
- National Natural Science Foundation of China [61975068]
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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. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.
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