Highly Fluorescent Carbon Dots as a Potential Fluorescence Probe for Selective Sensing of Ferric Ions in Aqueous Solution
This paper’s emphasis is on the development of a fluorescent chemosensor for Fe<sup>3+</sup> ions in an aqueous solution, using hydrophilic carbon dots (<i>O</i>-CDs). A simple, cost-effective, and environmentally friendly one-step hydrothermal synthesis method was used to sy...
Guardado en:
| Autores principales: | , , , , , , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
MDPI AG
2021
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/1c262c46bf474cf58c071e5b3b34dc4a |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| Sumario: | This paper’s emphasis is on the development of a fluorescent chemosensor for Fe<sup>3+</sup> ions in an aqueous solution, using hydrophilic carbon dots (<i>O</i>-CDs). A simple, cost-effective, and environmentally friendly one-step hydrothermal synthesis method was used to synthesize fluorescent hydrophilic <i>O</i>-CDs from <i>Oxalis corniculata</i> (Family; Oxalidaceae). The graphitic structure and size distribution of the <i>O</i>-CDs was verified by X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy studies. The resulting <i>O</i>-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 <i>O</i>-CDs. The synthesized hydrophilic <i>O</i>-CDs with excitation wavelength-dependent emission fluorescence characteristics showed a high quantum yield of about 20%. Besides this, the hydrophilic <i>O</i>-CDs exhibited a bright and controllable fluorescence with prolonged stability and photo-stability. These fluorescent hydrophilic <i>O</i>-CDs were used as a nanoprobe for the fluorometric identification of Fe<sup>3+</sup> ions in an aqueous solution, with high sensitivity and selectivity. By quenching the blue emission fluorescence of this nanosensor, a highly sensitive Fe<sup>3+</sup> 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 Fe<sup>3+</sup> ions with high biocompatibility and cellular imaging capacity, and it has a lot of potential in biomedical applications. |
|---|