Fluorescent probe based nitrogen doped carbon quantum dots with solid-state fluorescence for the detection of Hg2+ and Fe3+ in aqueous solution

An Overview of the Recent Developments in Carbon Quantum Dots—Promising Nanomaterials for Metal Ion Detection and (Bio)Molecule Sensing

“…In the reported work, the prepared N-CQDs were used for the detection of Hg 2+ and Fe 3+ ions (Figure 4). It was also found that the pH of the media has a significant effect on the sensing of mercury ions, as quenching intensity increases within the pH range from pH 3 to 7, and a significant decrease was observed from pH 7 to 11 [100]. This phenomenon could be explained by electrostatic repulsions between Hg 2+ ions and protonated N-CQDs preventing the formation of the N-CQDs-Hg 2+ complex in the extreme acidic media, which causes quenching.…”

“…A list of the novel CQDs-based sensors for the detection of Hg 2+ ions are summarized in Table 4. The N-CQDs-based sensor was developed by Zhu et al [100] using tartaric acid and L-arginine as precursors. The nanoparticles were synthesized by solvothermal method in ethanol at temperature of 180 • C for 12 h, and fluorescence QY was calculated as QY = 8.3%.…”

Tagetes erecta as an organic precursor: synthesis of highly fluorescent CQDs for the micromolar tracing of ferric ions in human blood serum

“…C-C (283.8 eV), C]C (284.5 eV), C-O (285.6 eV) and C]O (287.3 eV). 63,64 The N1s (Fig. 3c) peak corresponds to two different functional groups C-N-C (399.80) and N-H (401.69 eV).…”

“…3c) peak corresponds to two different functional groups C-N-C (399.80) and N-H (401.69 eV). 9,64 The O1s spectrum (Fig. 3d) describes two peaks corresponding to C]O (530.81 eV) and C-OH/C-O-C (532.31 eV).…”

Solid-state fluorescent carbon dots: quenching resistance strategies, high quantum efficiency control, multicolor tuning, and applications

“…Not all of CDs with concentration-induced redshift emit PL in solid state. In fact, some of them show solid-state fluorescence, 67 while others experience solid-state quenching. 47 Zhang et al 47 (Figure 6h).…”