Fluorescence turn-on and turn-off sensing of pesticides by carbon dot-based sensor

Abstract

Green chemistry C-Dot-based ‘turn-on’ and ‘turn-off’ fluorescence sensor for pesticides [imidacloprid (LOD ∼ 0.013 μM) and tetradifon (LOD ∼ 0.04 μM)] in aqueous solution.

Carbon quantum dots for the detection of antibiotics and pesticides

“…Most of the rapid detection of pesticides is achieved by monitoring their enzyme inhibition activity, however, a variety of pesticides can inhibit a particular enzyme leading to poor selectivity. However, with the recent development in 0-D nanomaterials, the interactions of pesticides with fluorescent CQDs have been reported to influence the fluorescence intensity depending upon the nature of interaction [51][52][53][54][55], which can be utilized as a transduction mechanism. Interaction of pesticides with CQDs leading to the perturbation of the recombination electronehole pair, different types of charge transfer, energy transfer, and IFE can lead to fluorescence change of CQDs.…”

A Comparative Study of Top-Down and Bottom-Up Carbon Nanodots and Their Interaction with Mercury Ions

“…Sensing is possibly among the most important applications of CDs, and certainly one of the most widespread [ 31 , 32 , 33 ]. Due to the excellent optical properties, the strong sensitivity of the fluorescence to the external environment [ 34 , 35 ], and the capability of CDs to behave as efficient electron donors [ 36 , 37 , 38 ], CDs are often proposed as detectors of various harmful substances, for example, heavy metals such as mercury [ 39 , 40 , 41 , 42 ], copper, and iron [ 43 , 44 , 45 , 46 ].…”

Novel methods for the rapid detection of trace tetracyclines based on the fluorescence behaviours of Maillard reaction fluorescent nanoparticles

“…On the one hand, with an increase in the rigidity of the molecular structure, the energy loss produced by the excited electrons state returning to the ground state was reduced; on the other hand, the self-complexation of MRFNs might be broken, which could reduce the aggregation of MRFNs molecules, so the dispersion state between MRFNs molecules was maintained, thus enhancing the uorescence of MRFNs. [37][38][39] Overall, the clear mechanism of CTC-induced uorescence enhancement of MRFNs still needs further experiments to prove.…”

“…It was speculated that the substituted chlorine on CTC might be a good leaving group because of the easy fracture of C-X (Cl). [35][36][37] Therefore, CTC could easily form covalent bonds with MRFNs (existing hydroxyl, carboxyl groups, and possibly amino groups) with a high affinity. On the one hand, with an increase in the rigidity of the molecular structure, the energy loss produced by the excited electrons state returning to the ground state was reduced; on the other hand, the self-complexation of MRFNs might be broken, which could reduce the aggregation of MRFNs molecules, so the dispersion state between MRFNs molecules was maintained, thus enhancing the uorescence of MRFNs.…”