Carbon dots: synthesis, properties and biomedical applications

Abstract

Carbon dots (CDs) are a new type of carbon nanomaterial that have unique physical and chemical properties, good biocompatibility, low toxicity, easy surface functionalization, making them widely used in biological...

Copper(II)-Doped Carbon Dots as Catalyst for Ozone Degradation of Textile Dyes

“…Figure 5 shows the UV-Vis ( Figure 5 a) and fluorescence emission at the maximum of the excitation (350 nm) ( Figure 5 b) spectra. The UV-Vis spectrum ( Figure 5 a) corresponds to a typical CD, with a strong absorption in the ultraviolet, tailing into the visible region [ 22 ]. Although not clear, there is a slight shoulder in the UV-Vis spectrum at about 350 nm (the maximum of the fluorescence excitation), which may be attributed to electronic transitions from C–O or C=O bonds to π* orbitals [ 19 ].…”

“…Taking into consideration natural resources, environmental sustainability and toxicity issues, carbon-based nanomaterials are preferred to metallic/semi-metallic materials in real-world applications [ 14 ]. Among such carbon-based nanomaterials, the synthetic versatility of carbon dots (CDs) [ 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] makes them the preferred choice for coupling to an AOP for the treatment of textile wastewater.…”

Mandelic acid appended chiral gels as efficient templates for multicolour circularly polarized luminescence

“…CNDs as luminescent materials possess enormous benefits such as, low production cost, good luminescence quantum yield, stability and biocompatibility. [49][50][51][52] The starting material for the synthesis includes chemical compounds like citric acid, urea and ethylenediamine that can provide carbon source. Based on the precursor material, these CNDs show additional benefits in numerous areas.…”

Ratiometric fluorescence assay based on carbon dots and Cu2+-catalyzed oxidation ofO-phenylenediamine for the effective detection of deferasirox

“…Fluorescence technology has attracted extensive interests in drug monitoring ascribed to its sensitivity, facile operation, fast analysis and controllable sample pre-treatment. 11,12 Using the copper ion or terbium ion as a ligand, fluorescence strategies through single changed intensity have been fabricated on the basis of a formed DEF-copper chelator 13,14 or DEF–terbium complex 1,15 at the specific testing conditions, such as incubation under alkaline conditions. 13 In general, most fluorescence sensing systems containing the fluorescence assay for DEF rely on the change of the fluorescence intensity from a single emission centre through a “switch-off” or “signal-on” strategy.…”

“… 26 Carbon dots (CDs), a new type of fluorescent carbon nanomaterials in analytical applications, 27,28 possess the advantages of controllable optical properties, water solubility, simple preparation, and facile surface functionalization. 11 Meanwhile, for specific detection applications, synthetic designs of CDs are needed with particular excitation/emission properties, 14 enhanced fluorescence quantum yield (QY), 29 and other surface properties. 13 Correspondingly, with variable sources available, several strategies including the microwave-assisted method, melting procedure, and solvothermal approach have been developed for CDs preparation with modulated physicochemical properties.…”