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 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 O-CDs from Oxalis corniculata (Family; Oxalidaceae). The graphitic structure size distribution verified by X-ray diffraction, Raman spectroscopy, high-resolution transmission electron microscopy studies. resulting had near-spherical shape adequate degree graphitization at core, with average diameter 4.5 nm. photoelectron Fourier transform infrared spectroscopy methods revealed presence several groups (carbonyl, amine, carboxyl, hydroxyl, along nitrogen oxygen-rich molecules) surface O-CDs. synthesized excitation wavelength-dependent emission fluorescence characteristics showed high quantum yield about 20%. Besides this, exhibited bright controllable prolonged stability photo-stability. These were as nanoprobe fluorometric identification sensitivity selectivity. By quenching blue this nanosensor, highly sensitive ion range 10–50 µM minimum detection limit 0.73 achieved. In addition, developed nanosensor can be sense intracellular biocompatibility cellular imaging capacity, it has lot potential biomedical applications.