Abstract
In this paper, a sensing system based on the combination of methimethazole functionalized microfiber and fiber Bragg grating (FBG) is proposed for the monitoring of heavy metal ion - chromium (Ⅵ) ion (Cr6+) in domestic water. The reaction of methimazole with Cr6+ under acidic conditions detachs methimazole from the microfiber, which affecting the surface refractive index and causing wavelength shift of the interference spectrum. The experimental results of Cr6+ detection in tap water show that the sensor has obvious response to Cr6+ in the concentration range of 5 × 10−14-2 × 10−12 M, and the sensitivity is as high as − 6.6 × 1012 nm/M in the concentration range of 5 × 10−14-2.5 × 10−13 M with the detection limit of 2.7 × 10−15 M. Moreover, the differential modulation is used in the sensing system to detect Cr6+ through power change of FBG, which improves the sensitivity of the sensor and realizes lower detection limit and detection cost. The optimized sensitivity and detection limit by differential modulation are 1.53 × 1013 dB/M and 1.3 × 10−14 M, respectively. Therefore, this sensing system has high sensitivity, good selectivity and stability, and has a good application prospect in chromium (Ⅵ) ion detection.
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