کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7140163 | 1462025 | 2018 | 18 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Ratiometric fluorescence sensor for Fe3+ ions detection based on quantum dot-doped hydrogel optical fiber
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Sensors and Actuators B: Chemical - Volume 264, 1 July 2018, Pages 52-58
Journal: Sensors and Actuators B: Chemical - Volume 264, 1 July 2018, Pages 52-58
نویسندگان
Minjuan Zhou, Jingjing Guo, Changxi Yang,