Tapered Mach–Zehnder interferometer based on PbS quantum dots modified by polymers for copper ion sensing

An optical fiber interferometer coated with PbS quantum dots (QDs) was developed for copper ion ( C u 2 + ) detection. The QDs were modified by a multifunctional copolymer that enabled QD surface ligation, dispersion, and coordination with C u 2 + . C u 2 + coordination with the polymer induced chan...

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Bibliographic Details
Published in:Applied optics (2004) 2021-06, Vol.60 (16), p.4807
Main Authors: Yan, Yuyang, Fan, Meiduan, Zhou, Shuang, Sun, Xiaolan, Ma, Longfei, Li, Ruoyu, Kost, Alan R.
Format: Article
Language:English
Subjects:
Coordination
Copolymers
Copper
Mach-Zehnder interferometers
Optical fibers
Quantum dots
Refractivity
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Summary:An optical fiber interferometer coated with PbS quantum dots (QDs) was developed for copper ion ( C u 2 + ) detection. The QDs were modified by a multifunctional copolymer that enabled QD surface ligation, dispersion, and coordination with C u 2 + . C u 2 + coordination with the polymer induced changes in the surrounding refractive index of the interferometer. The sensor was highly selective for C u 2 + and showed a linear detection range of 0–1000 µM with a limit of detection of 2.20 µM in both aqueous and biological solutions.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.425453