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Highly Fluorescent Carbon Dots as a Potential Fluorescence Probe for Selective Sensing of Ferric Ions in Aqueous Solution
- Source :
- Chemosensors, Vol 9, Iss 301, p 301 (2021), Chemosensors; Volume 9; Issue 11; Pages: 301
- Publication Year :
- 2021
- Publisher :
- MDPI AG, 2021.
-
Abstract
- This paper’s emphasis is on the development of a fluorescent chemosensor for Fe3+ ions in an aqueous solution, using hydrophilic carbon dots (O-CDs). A simple, cost-effective, and environmentally friendly one-step hydrothermal synthesis method was used to synthesize fluorescent hydrophilic O-CDs from Oxalis corniculata (Family; Oxalidaceae). The graphitic structure and size distribution of the O-CDs was verified by X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy studies. The resulting O-CDs had a near-spherical shape and an adequate degree of graphitization at the core, with an average diameter of 4.5 nm. X-ray photoelectron and Fourier transform infrared spectroscopy methods revealed the presence of several hydrophilic groups (carbonyl, amine, carboxyl, and hydroxyl, along with nitrogen and oxygen-rich molecules) on the surface of O-CDs. The synthesized hydrophilic O-CDs with excitation wavelength-dependent emission fluorescence characteristics showed a high quantum yield of about 20%. Besides this, the hydrophilic O-CDs exhibited a bright and controllable fluorescence with prolonged stability and photo-stability. These fluorescent hydrophilic O-CDs were used as a nanoprobe for the fluorometric identification of Fe3+ ions in an aqueous solution, with high sensitivity and selectivity. By quenching the blue emission fluorescence of this nanosensor, a highly sensitive Fe3+ ion in the range of 10–50 µM with a minimum detection limit of 0.73 µM was achieved. In addition, the developed nanosensor can be used to sense intracellular Fe3+ ions with high biocompatibility and cellular imaging capacity, and it has a lot of potential in biomedical applications.
- Subjects :
- hydrothermal
Aqueous solution
Quenching (fluorescence)
Materials science
fluorescence quenching
Nanoprobe
hydrophilic carbon dots
QD415-436
fluorescent sensor
Photochemistry
Biochemistry
Fluorescence
Analytical Chemistry
Oxalis corniculata
symbols.namesake
Nanosensor
symbols
Molecule
Physical and Theoretical Chemistry
Fourier transform infrared spectroscopy
Raman spectroscopy
Subjects
Details
- ISSN :
- 22279040
- Volume :
- 9
- Database :
- OpenAIRE
- Journal :
- Chemosensors
- Accession number :
- edsair.doi.dedup.....7bee6376ab756fcafbc47ed28f1b4a76