Stimulus responsive hydrogel-coated etched fiber Bragg grating for carcinogenic chromium (VI) sensing

Pabbisetti Vayu Nandana Kishore; Sai Shankar Madhuvarasu; Satyanarayana Moru

doi:10.1117/1.OE.57.1.017101

2 January 2018 Stimulus responsive hydrogel-coated etched fiber Bragg grating for carcinogenic chromium (VI) sensing

Pabbisetti Vayu Nandana Kishore, Sai Shankar Madhuvarasu, Satyanarayana Moru

Author Affiliations +

Optical Engineering, Vol. 57, Issue 1, 017101 (January 2018). https://doi.org/10.1117/1.OE.57.1.017101

Abstract

This paper proposes a chemo-mechanical-optical sensing approach for the detection of carcinogenic chromium (VI) metal ion using an etched fiber Bragg grating (FBG) coated with stimulus responsive hydrogel. Hydrogel synthesized from the blends of (3-acrylamidopropyl)—trimethylammonium chloride, which is highly responsive to chromium ions suffers a volume change when placed in Cr solution. When the proposed sensor system is exposed to various concentrations of Cr (VI) ion solution, FBG peak shifts due to the mechanical strain induced by the swelling of the hydrogel. The peak shift is correlated with the concentration of the Cr (VI) metal ion. Due to the reduction in the cladding diameter of FBG, wastage of swelling force due to hydrogel on FBG is lowered and utilized for more wavelength peak shift of FBG resulting in the increase in the sensitivity. The resolution of the sensor system is found to be 0.072 ppb. Trace amounts of chromium (VI) ion as low as 10 ppb can be sensed by this method. The sensor has shown good sensitivity, selectivity, and repeatability. The salient features of the sensors are its compact size, light weight, and adoptability for remote monitoring.

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Pabbisetti Vayu Nandana Kishore, Sai Shankar Madhuvarasu, and Satyanarayana Moru "Stimulus responsive hydrogel-coated etched fiber Bragg grating for carcinogenic chromium (VI) sensing," Optical Engineering 57(1), 017101 (2 January 2018). https://doi.org/10.1117/1.OE.57.1.017101

Received: 17 August 2017; Accepted: 5 December 2017; Published: 2 January 2018

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