Detection of copper ions in an aqueous solution by a dual-peak long period fiber grating functionalized with a polypyrrole–chitosan composite

A dual-peak long period fiber grating (DP-LPFG) sensor functionalized by polypyrrole–chitosan composite was proposed for sensitive detection of Cu 2+ ions in aqueous solution. The nitrogen atom on the polypyrrole ring and the amino group on the chitosan chain in the complex matrix can chelate the Cu...

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Bibliographic Details
Published in:Optics express Vol. 31; no. 4; p. 6590
Main Authors: Li, Yaowei, Liu, Ting, Ge, Kaixin, Gan, Wenbo, Dai, Shixun, Xu, Tiefeng, Zhang, Peiqing
Format: Journal Article
Language:English
Published: United States 13.02.2023
ISSN:1094-4087, 1094-4087
Online Access:Get full text
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Summary:A dual-peak long period fiber grating (DP-LPFG) sensor functionalized by polypyrrole–chitosan composite was proposed for sensitive detection of Cu 2+ ions in aqueous solution. The nitrogen atom on the polypyrrole ring and the amino group on the chitosan chain in the complex matrix can chelate the Cu 2+ ions. Thus, the refractive index of the overlay changed and further modulated the transmission spectrum of DP-LPFG. After special design, the double peaks can move in opposite directions with the increase of Cu 2+ ion concentration, thereby greatly improving detection sensitivity. The linear sensitivity of the fabricated sensor was measured to be 9.12 and 2.14 nm/ppm (0.61 and 0.14 nm/µM) for concentrations of 0.1–0.5 (1.5 µM-7.5 µM) and 0.5–2 ppm (7.5 µM-30 µM), respectively. In addition, the Langmuir isothermal model was used to evaluate the overall response of the sensor to Cu 2+ ions quantitatively, and the detection limit was determined to be 0.05 ppb (0.75 nM). This ingenious sensor offers a new solution for sensitive detection of heavy metal ions in environmental water.
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ISSN:1094-4087
1094-4087
DOI:10.1364/OE.482236