Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7140163 | Sensors and Actuators B: Chemical | 2018 | 18 Pages |
Abstract
We develop a novel ratiometric fluorescence sensor based on CdTe quantum dots (QDs) doped hydrogel optical fiber for selective and on-site detection of Fe3+ ions in real time. The hydrogel fiber is made of a core-cladding structure with a step-index profile to confine light within the core. Two types of QDs, the green emissive thioglycolic acid capped quantum dots (gQDs) and red emissive N-Acetyl-l-cysteine capped QDs (rQDs), are synthesized and incorporated in the core of the hydrogel fiber. The rQDs can be selectively quenched by the Fe3+ ions that diffuse into the hydrogel matrix while the gQDs are immune to Fe3+ ions and exhibit stable fluorescence emission. By ratiometric detection of the fluorescence intensities of the two QDs, quantitative and selective detection of Fe3+ ions is achieved in a linear range of 0-3.5â¯Î¼M with a detection limit of 14â¯nM. The cladded hydrogel fiber doped with QDs enables efficient laser excitation and fluorescence collection in water. Our results reveal that the ratiometric sensing based on multi-QDs doped fiber can be feasibly applied for real-time and on-site analysis of heavy metal ions in aqueous environments.
Related Topics
Physical Sciences and Engineering
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Authors
Minjuan Zhou, Jingjing Guo, Changxi Yang,