Turn–on fluorescent sensor for the detection of periodate anion following photochemical synthesis of nitrogen and sulphur co–doped carbon dots from vegetables
| Autor: | Carlos Bendicho, Vanesa Romero, Inmaculada de la Calle, Victoria Vila, Isela Lavilla |
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| Rok vydání: | 2019 |
| Předmět: |
Detection limit
Metals and Alloys chemistry.chemical_element Periodate Quantum yield 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Photochemistry 01 natural sciences Fluorescence Sulfur 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Materials Chemistry Electrical and Electronic Engineering 0210 nano-technology Spectroscopy Luminescence Instrumentation Carbon |
| Zdroj: | Sensors and Actuators B: Chemical. 280:290-297 |
| ISSN: | 0925-4005 |
| DOI: | 10.1016/j.snb.2018.10.064 |
| Popis: | In this work, a novel one–step ‘bottom–up’ synthetic approach is described for obtaining highly fluorescent nitrogen (N) and sulphur (S) co–doped carbon dots (CDs) following photochemical oxidation of carbohydrates naturally occurring in vegetables. N and S co–doping allows more active sites in the CDs surface resulting in an enhancement of their luminescent properties. Among the 18 vegetables studied as green precursors of CDs, those rich in proteins and glucosinolates (natural S–linked glucosides), such as cruciferous vegetables (Brassicaceae family), i.e. broccoli, cauliflower and Romanesco, facilitate an efficient N and S co–doping of the CDs during the photochemical reaction without the need for further post–synthetic treatments. A comprehensive characterization of CDs obtained from broccoli was performed by transmission electron microscopy, elemental analysis, X–ray fluorescence (total reflection), UV–Vis absorption and Fourier transform–infrared spectroscopy. Quantum yields and fluorescence up–conversion properties were also investigated. Monodisperse CDs (∼8 nm average size) with up–conversion fluorescence properties and a quantum yield (QY) of 22% are obtained. More importantly, a dramatic increase in the CDs fluorescence (turn–on) is observed when the highly oxidant periodate anion (IO4−) is added to the reaction medium, which allowed us to construct a sensitive and selective fluorescent assay for the detection of periodate anion in wastewater samples. The detection limit was 19 μM IO4− and the repeatability expressed as the relative standard deviation was 3.2% (N = 5). |
| Databáze: | OpenAIRE |
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