2,4,6-Trinitrophenol detection by a new portable sensing gadget using carbon dots as a fluorescent probe

Green synthetic nitrogen-doped graphene quantum dot fluorescent probe for the highly sensitive and selective detection of tetracycline in food samples

“…5(d) , the fluorescence lifetime of the N-GQDs was essentially unchanged by the addition of TC, the fluorescence lifetimes of N-GQDs were 4.11 ns ( τ 1 = 2.18 ns, τ 2 = 5.84 ns) and 4.03 ns ( τ 1 = 2.12 ns, τ 2 = 5.52 ns) after the addition of TC, where the concentration of TC was 5 × 10 −6 M. Thus, IFE was shown to be TC induced fluorescence quenching of N-GQDs as the main mechanism. 59 …”

Carbon dot composites for bioapplications: a review

“…Known as picric acid, 2,4,6-trinitrophenol (TNP) is a general precursor for the production of fireworks, explosives and dyes with a low safety factor and strong explosive ability. 371 Thus, the accurate and sensitive detection of TNP is also very important. 372,373 To detect TNP, Ye et al developed a TNP sensing platform using N, B-doped CDs.…”

“…For instance, in Yan and co-workers’ study, glyoxylic acid-modified CDs (GA-CDs) were used as a FRET ratiometric fluorescent probe for the detection of Cu 2+ in aqueous solution. 388 Similarly, Chen et al also applied cyclam-functionalized CDs as a FRET nanoprobe for the detection of Cu 2+ and S. 2–389 In addition to the above examples, the detection of other important metal ions such as Ag + , Cu 2+ , Cr 6+ , and Pb 2+ has also been successfully realized with CD composite-based sensing platforms. 390–401…”

Recent development in carbon dot-based gas sensors

“…In UV-Vis absorption spectra of CDs (figure 6a), wavelength peak around 230-280 nm and 310-360 nm correspond to the π-π* transition of C-C bonds and n-π* transition of C=O bonds respectively [2,15,39,41,80,81]. Energy gap between π and π* orbitals depend on size of sp 2 clusters or conjugation length [2].…”