5 years ago

Highly selective detection of phosphate ion based on a single-layered graphene quantum dots-Al3+ strategy

Highly selective detection of phosphate ion based on a single-layered graphene quantum dots-Al3+ strategy
Determination of phosphate ion (PO4 3-) is important in biomedical and environmental arrays because its controlling concentrations are associated with different pathologies or the quality of water. Herein, we report a new type of photoluminescence (PL) probe for highly selective detection of PO4 3- based on a single-layered graphene quantum dots chelating with aluminium ions (s-GQDs-Al3+) system. The PL of s-GQDs can be enhanced by Al3+ through the aggregation-induced emission enhancement (AIEE) effect. With the addition of PO4 3-, the PL of the s-GQDs-Al3+ system is faded away because PO4 3- has stronger coordination with Al3+ which results in the elimination of AIEE effect and the decrease in the PL intensity of the s-GQDs-Al3+ system. Therefore, the s-GQDs-Al3+ system can behave as an on-off type PL probe for PO4 3- detection. It is found that the PL intensity ratio (I/I 0) of s-GQDs in the presence of Al3+ at 463nm is proportional to the concentration of PO4 3- in the range of 0.25–7.5μM with the limit of detection as low as 0.1μM. This selective assay has a great application prospect in the complex matrixes owing to its simplicity and specificity for PO4 3- detection.

Publisher URL: www.sciencedirect.com/science

DOI: S0039914017309475

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