Simple and sensitive fluorescence sensor for methotrexate detection based on the inner filter effect of N, S co-doped carbon quantum dots

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.…”

Ascorbic acid stabilised copper nanoclusters as fluorescent sensors for detection of quercetin

“…This could provide some evidences for the occurrence of internal lter effects (IFE). 35,36 In addition, to further verify the possibility of the IFE mechanism, the uorescence lifetimes of AA-Cu NCs was analyzed in the absence and presence of quercetin, respectively. As Fig.…”

Co2+ detection, cell imaging, and temperature sensing based on excitation-independent green-fluorescent N-doped carbon dots

“…The effective IFE demands a complementary/overlap of the absorption spectrum of the absorbers and excitation and/or emission spectra of uorophores. 8,[45][46][47] A good overlap between the emission spectrum of the as-prepared N-CDs and absorption band of Co 2+ was observed, which conrmed the IFE mechanism of Co 2+ sensing. Furthermore, the average uorescence lifetimes of N-CDs and N-CDs/Co 2+ were 3.53 ns and 3.60 ns, respectively, as shown in Fig.…”