Abstract
A Chemo-mechanical-optical sensing approach for the detection of hexagonal chromium (Cr6+) metal ion is demonstrated. A new sensor head is designed by epoxying fiber Bragg grating (FBG) on a thin silicon membrane beneath which a Chromium (VI) responsive hydrogel is embedded. When the gel is exposed to chromium spiked solutions, it suffers a volume change due to its stimulus responsive property and deforms a silicon membrane which in turn causes a wavelength peak shift of FBG. Hydrogel synthesized from the blends of (3-Acrylamidopropyl)—trimethylammonium chloride is used for the purpose. The relation between FBG peak shifts with change in volume of hydrogel due to it swelling is experimentally established. The FBG wavelength peak shift is directly correlated with the concentration of the Cr (VI) metal ion. The estimated sensitivity and resolution of the sensor are 0.1 nm/ppb with a limit of detection of the sensor is 0.75 ppb. The sensor has demonstrated good sensitivity, selectivity, and repeatability.
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The authors are very thankful to Department of Physics, National Institute of Technology-Warangal (NIT-W) for providing needful lab facilities.
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Pratima, B.M., Kishore, P.V.N., Ashok, J. et al. Carcinogenic Chromium (VI) Sensing Using Transducing Characteristics of Fiber Bragg Grating and Physical Swelling of Hydrogel. Sens Imaging 23, 27 (2022). https://doi.org/10.1007/s11220-022-00396-0
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DOI: https://doi.org/10.1007/s11220-022-00396-0