Synthesis of polymer quantum dots with wide range of pH stability and mechanism studies for Fe<sup>3+</sup> and Hg<sup>2+</sup> ion detection
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초록
내용
Polymer quantum dots (PQDs) show excellent sensing performance with quenching phenomenon through electron transfer, inner filter effects, and non-radiative complex formation with specific ions. However, there is a reliability bottleneck because it is difficult to distinguish between the pH change of the buffer and the interaction with metal ions in the photo-chemical sensing results. In this study, PQDs with wide range of pH stability were developed by introducing silane-based shelling technology. The limit of detection, calculated from Stern-Volmer plots, of Fe3+ and Hg2+ ions was 55 and 7 nM, respectively. In addition, the metal ion sensing mechanism of Fe3+ and Hg2+ ions was suggested inner filter effects and photo-induced electron transfer. Because of the different detection mechanisms, the two trace levels of harmful ions can be detected in waste water without further processing. This can be used in water quality environment and heavy metal sensing fields.