One-pot hydrothermal synthesis of high quantum yield orange-emitting carbon quantum dots for sensitive detection of perfluorinated compounds

Abstract

We have prepared a new type of carbon quantum dots (CQDs) with orange fluorescence and high fluorescence quantum yield through a rapid hydrothermal approach. The CQDs were effective for sensitive...

Polyfluoroalkyl Substances (PFASs) Detection Via Carbon Dots: A Review

“…Regarding its photoluminescence, the CDs presented an excitation-dependent emission, with their emission peak occurring at 596 nm (for an λ ex of 560 nm), and an estimated QY FL of 47.1%. Finally, the CDs presented much lower toxicity towards human cells than QDs, even at higher concentrations [112].…”

“…Given the fact that other luminescent nanoparticles, such as Fe 3 O 4 and QDs, are already used for PFAS sensing, it is unsurprising that CDs, with their high photoluminescence and possibility of up-conversion, present their potential for the same purpose. Thus far, there have been several studies reporting different ways of quantifying PFASs with CDs, with the vast majority being dependent on alterations in the nanoparticles' photoluminescence upon combination with PFASs or combinations of PFASs with another chemical agent [45,[110][111][112][113][114].…”

“…Thus, to better understand their properties and the detection mechanism, we have carried out an in-depth analysis of several examples. We start with the work of Hong et al, who prepared a new type of high QY FL , orange-emitting CDs for the selective sensing of PFOA and PFOS in water samples [112]. Considering that the traditional PFOS detection methods presented a number of problems, such as being complex, high cost, and having low selectivity, this team decided to base themselves on the work of other researchers who had already turned to the use of QDs to overcome this problem [73].…”

“…Considering that the traditional PFOS detection methods presented a number of problems, such as being complex, high cost, and having low selectivity, this team decided to base themselves on the work of other researchers who had already turned to the use of QDs to overcome this problem [73]. Furthermore, Hong and his team also tried to solve the limitations associated with QDs by turning their attention to CDs, which present the same photoluminescent properties of QDs while being low cost and nontoxic, resulting in the formation of a probe that was able to make a safe, rapid, sensitive, and specific detection of the target analyte [112].…”

“…The CDs were prepared from phosphoric acid (200 µL) and 4-(diethylamino) salicylaldehyde (20 mg) via hydrothermal treatment (200 • C for 1 h) [112]. After their synthesis, the CDs were purified via centrifugation (12,000 rpm for 5 min) and dialysis (1000 Da MWCO) for 48 h and lyophilized.…”