Dual-emitter polymer carbon dots with spectral selection towards nanomolar detection of iron and aluminum ions

An insight into embryogenesis interruption by carbon nitride dots: can they be nucleobase analogs?

“…However, as for different nucleobase-incorporated CNDs, with the addition of Ca 2+ at 0.3 mM, both A-CNDs and C-CNDs showed PL emission reduction while G-CNDs, T-CNDs and U-CNDs exhibited PL emission improvement, suggesting two major different CND-Ca 2+ interaction modes for A-CNDs and C-CNDs (electron/energy transfer), and G-CNDs, T-CNDs, and U-CNDs (chelation). 65 These results are consistent with high contents of surface oxygencontaining functional moieties for A-CNDs, C-CNDs and high contents of surface hydrophilic functional groups such as -OH and -NH 2 for the rest three nucleobase-incorporated CNDs. However, after the Ca 2+ concentration was increased to 2 mM, the F 0 /F − 1 value for C-CNDs remained positive while it became negative for A-CNDs, which demonstrated a change in the A-CND-Ca 2+ interaction from electron/energy transfer to chelation.…”

Luminescent carbon quantum dots derived from syzygium cumini seeds with endogenous anti-oxidant and cytotoxic potency including in vitro photoluminescence and live cell imaging

“…4 Apart from these, a newly emerging class of CDs as carbonized polymer dots possessing the characteristics and structures of polymer-carbon hybrid structures have gained the interest of researchers. [5][6][7] CDs are popular in the field of biomedicine and depict the most promising studies on the in vivo cytotoxicity of a variety of cell lines, which ultimately show that CDs exhibit good biocompatibility even at high concentration levels and possess low or no toxicity. 4 Several biomedical uses of CDs, such as phototherapy, medication, gene delivery, nanomedicine, and bioimaging have also been explored.…”

Dual-Emission Carbon Dots for Fluorescent Sensing of Permanganate

“…14−16 Ratio sensors based on dual-emission carbon dots (D-CDs) which simultaneously emit two FL emissions under one-wavelength excitation could achieve higher sensitivity and selectivity utilizing more recognition moieties. 17,18 The intensity ratio at two different wavelengths can be used to deduct system error generated from the solvent polarity, incident light, or sensor concentration. In particular, the D-CDs with two dynamic emissions are not susceptible to interference from a wide variety of ions in actual waters, which are responsible for the independent recognition sites.…”

“…Advances in sensor technology have provided access to portable determination of MnO 4 – , including ultraviolet–visible (UV–vis), electrochemical, and fluorescence (FL) sensors. , Carbon dots (CDs) as a zero-dimensional nanomaterial have attracted remarkable attention due to their superior luminescence, facile preparation, and excellent solubility, with applications in chemical analysis, biological imaging, targeted drug delivery, energy conversion, etc. , Several detection platforms via the FL quenching have been constructed employing the single-emission CDs; however, there are still some restrictions in sensitivity and selectivity. − Ratio sensors based on dual-emission carbon dots (D-CDs) which simultaneously emit two FL emissions under one-wavelength excitation could achieve higher sensitivity and selectivity utilizing more recognition moieties. , The intensity ratio at two different wavelengths can be used to deduct system error generated from the solvent polarity, incident light, or sensor concentration. In particular, the D-CDs with two dynamic emissions are not susceptible to interference from a wide variety of ions in actual waters, which are responsible for the independent recognition sites.…”